Update to ruby/spec@c1b568b

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62656 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

133 files changed, 309 insertions, 309 deletions

diff --git a/spec/ruby/core/string/allocate_spec.rb b/spec/ruby/core/string/allocate_spec.rb
index 9048815c5d..5b36b4fd05 100644
--- a/spec/ruby/core/string/allocate_spec.rb
+++ b/spec/ruby/core/string/allocate_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String.allocate" do
   it "returns an instance of String" do
diff --git a/spec/ruby/core/string/append_spec.rb b/spec/ruby/core/string/append_spec.rb
index 87b2dca725..1e1667f617 100644
--- a/spec/ruby/core/string/append_spec.rb
+++ b/spec/ruby/core/string/append_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/concat', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/concat'
 
 describe "String#<<" do
   it_behaves_like :string_concat, :<<
diff --git a/spec/ruby/core/string/ascii_only_spec.rb b/spec/ruby/core/string/ascii_only_spec.rb
index 1bf9cfa4a1..3dce10fab3 100644
--- a/spec/ruby/core/string/ascii_only_spec.rb
+++ b/spec/ruby/core/string/ascii_only_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 with_feature :encoding do
   describe "String#ascii_only?" do
diff --git a/spec/ruby/core/string/b_spec.rb b/spec/ruby/core/string/b_spec.rb
index 89fcedf7c4..6599c23d73 100644
--- a/spec/ruby/core/string/b_spec.rb
+++ b/spec/ruby/core/string/b_spec.rb
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#b" do
   with_feature :encoding do
diff --git a/spec/ruby/core/string/bytes_spec.rb b/spec/ruby/core/string/bytes_spec.rb
index b1f5ba412f..e7d3a7fbd8 100644
--- a/spec/ruby/core/string/bytes_spec.rb
+++ b/spec/ruby/core/string/bytes_spec.rb
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#bytes" do
   before :each do
diff --git a/spec/ruby/core/string/bytesize_spec.rb b/spec/ruby/core/string/bytesize_spec.rb
index 51da179da8..527b4a5dd5 100644
--- a/spec/ruby/core/string/bytesize_spec.rb
+++ b/spec/ruby/core/string/bytesize_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 with_feature :encoding do
   describe "#String#bytesize" do
diff --git a/spec/ruby/core/string/byteslice_spec.rb b/spec/ruby/core/string/byteslice_spec.rb
index 263810971e..df99db95c6 100644
--- a/spec/ruby/core/string/byteslice_spec.rb
+++ b/spec/ruby/core/string/byteslice_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: binary -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/slice.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/slice'
 
 describe "String#byteslice" do
   it "needs to reviewed for spec completeness"
diff --git a/spec/ruby/core/string/capitalize_spec.rb b/spec/ruby/core/string/capitalize_spec.rb
index 971b06281e..e279f7d061 100644
--- a/spec/ruby/core/string/capitalize_spec.rb
+++ b/spec/ruby/core/string/capitalize_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#capitalize" do
   it "returns a copy of self with the first character converted to uppercase and the remainder to lowercase" do
diff --git a/spec/ruby/core/string/case_compare_spec.rb b/spec/ruby/core/string/case_compare_spec.rb
index a4f2d7960e..b83d1adb91 100644
--- a/spec/ruby/core/string/case_compare_spec.rb
+++ b/spec/ruby/core/string/case_compare_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../shared/eql', __FILE__)
-require File.expand_path('../shared/equal_value', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'shared/eql'
+require_relative 'shared/equal_value'
 
 describe "String#===" do
   it_behaves_like :string_eql_value, :===
diff --git a/spec/ruby/core/string/casecmp_spec.rb b/spec/ruby/core/string/casecmp_spec.rb
index f556c79346..9e89e1314d 100644
--- a/spec/ruby/core/string/casecmp_spec.rb
+++ b/spec/ruby/core/string/casecmp_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#casecmp independent of case" do
   it "returns -1 when less than other" do
diff --git a/spec/ruby/core/string/center_spec.rb b/spec/ruby/core/string/center_spec.rb
index 4a40ef88bf..145db01b70 100644
--- a/spec/ruby/core/string/center_spec.rb
+++ b/spec/ruby/core/string/center_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#center with length, padding" do
   it "returns a new string of specified length with self centered and padded with padstr" do
diff --git a/spec/ruby/core/string/chars_spec.rb b/spec/ruby/core/string/chars_spec.rb
index 7f764a3e43..54876f9f9d 100644
--- a/spec/ruby/core/string/chars_spec.rb
+++ b/spec/ruby/core/string/chars_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../shared/chars', __FILE__)
-require File.expand_path('../shared/each_char_without_block', __FILE__)
+require_relative 'shared/chars'
+require_relative 'shared/each_char_without_block'
 
 describe "String#chars" do
   it_behaves_like :string_chars, :chars
diff --git a/spec/ruby/core/string/chomp_spec.rb b/spec/ruby/core/string/chomp_spec.rb
index 4f7486b0f7..6fa8d7c6c5 100644
--- a/spec/ruby/core/string/chomp_spec.rb
+++ b/spec/ruby/core/string/chomp_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#chomp" do
   describe "when passed no argument" do
diff --git a/spec/ruby/core/string/chop_spec.rb b/spec/ruby/core/string/chop_spec.rb
index 6afee99685..57c037322d 100644
--- a/spec/ruby/core/string/chop_spec.rb
+++ b/spec/ruby/core/string/chop_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#chop" do
   it "removes the final character" do
diff --git a/spec/ruby/core/string/chr_spec.rb b/spec/ruby/core/string/chr_spec.rb
index a5e0cc4c88..ca56955866 100644
--- a/spec/ruby/core/string/chr_spec.rb
+++ b/spec/ruby/core/string/chr_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 with_feature :encoding do
   describe "String#chr" do
diff --git a/spec/ruby/core/string/clear_spec.rb b/spec/ruby/core/string/clear_spec.rb
index 3db8b54cb0..8b0ff8a8e6 100644
--- a/spec/ruby/core/string/clear_spec.rb
+++ b/spec/ruby/core/string/clear_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 with_feature :encoding do
   describe "String#clear" do
diff --git a/spec/ruby/core/string/clone_spec.rb b/spec/ruby/core/string/clone_spec.rb
index 3940858e53..6259cf89ef 100644
--- a/spec/ruby/core/string/clone_spec.rb
+++ b/spec/ruby/core/string/clone_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#clone" do
   before :each do
diff --git a/spec/ruby/core/string/codepoints_spec.rb b/spec/ruby/core/string/codepoints_spec.rb
index bae83ba86d..66f2884168 100644
--- a/spec/ruby/core/string/codepoints_spec.rb
+++ b/spec/ruby/core/string/codepoints_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: binary -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../shared/codepoints', __FILE__)
-require File.expand_path('../shared/each_codepoint_without_block', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'shared/codepoints'
+require_relative 'shared/each_codepoint_without_block'
 
 with_feature :encoding do
   describe "String#codepoints" do
diff --git a/spec/ruby/core/string/comparison_spec.rb b/spec/ruby/core/string/comparison_spec.rb
index 5a0e7fabc3..01199274b6 100644
--- a/spec/ruby/core/string/comparison_spec.rb
+++ b/spec/ruby/core/string/comparison_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#<=> with String" do
   it "compares individual characters based on their ascii value" do
diff --git a/spec/ruby/core/string/concat_spec.rb b/spec/ruby/core/string/concat_spec.rb
index 939be5ed0a..27917d6c85 100644
--- a/spec/ruby/core/string/concat_spec.rb
+++ b/spec/ruby/core/string/concat_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/concat', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/concat'
 
 describe "String#concat" do
   it_behaves_like :string_concat, :concat
diff --git a/spec/ruby/core/string/count_spec.rb b/spec/ruby/core/string/count_spec.rb
index 3afb79a9fc..e82a7c77ca 100644
--- a/spec/ruby/core/string/count_spec.rb
+++ b/spec/ruby/core/string/count_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: binary -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#count" do
   it "counts occurrences of chars from the intersection of the specified sets" do
diff --git a/spec/ruby/core/string/crypt_spec.rb b/spec/ruby/core/string/crypt_spec.rb
index d3bf5ec732..697dfd5190 100644
--- a/spec/ruby/core/string/crypt_spec.rb
+++ b/spec/ruby/core/string/crypt_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#crypt" do
   # Note: MRI's documentation just says that the C stdlib function crypt() is
diff --git a/spec/ruby/core/string/delete_prefix_spec.rb b/spec/ruby/core/string/delete_prefix_spec.rb
index 973fc951cb..4b4858c9c2 100644
--- a/spec/ruby/core/string/delete_prefix_spec.rb
+++ b/spec/ruby/core/string/delete_prefix_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 ruby_version_is '2.5' do
   describe "String#delete_prefix" do
diff --git a/spec/ruby/core/string/delete_spec.rb b/spec/ruby/core/string/delete_spec.rb
index 049f56e926..8725b54c3b 100644
--- a/spec/ruby/core/string/delete_spec.rb
+++ b/spec/ruby/core/string/delete_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#delete" do
   it "returns a new string with the chars from the intersection of sets removed" do
diff --git a/spec/ruby/core/string/delete_suffix_spec.rb b/spec/ruby/core/string/delete_suffix_spec.rb
index 72adcacc55..8541c1d5d2 100644
--- a/spec/ruby/core/string/delete_suffix_spec.rb
+++ b/spec/ruby/core/string/delete_suffix_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 ruby_version_is '2.5' do
   describe "String#delete_suffix" do
diff --git a/spec/ruby/core/string/downcase_spec.rb b/spec/ruby/core/string/downcase_spec.rb
index adb5f83cfa..30116db5e6 100644
--- a/spec/ruby/core/string/downcase_spec.rb
+++ b/spec/ruby/core/string/downcase_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#downcase" do
   it "returns a copy of self with all uppercase letters downcased" do
diff --git a/spec/ruby/core/string/dump_spec.rb b/spec/ruby/core/string/dump_spec.rb
index db743ad08f..503848221c 100644
--- a/spec/ruby/core/string/dump_spec.rb
+++ b/spec/ruby/core/string/dump_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#dump" do
   it "taints the result if self is tainted" do
diff --git a/spec/ruby/core/string/dup_spec.rb b/spec/ruby/core/string/dup_spec.rb
index 81fb1308cc..3c6021b5c2 100644
--- a/spec/ruby/core/string/dup_spec.rb
+++ b/spec/ruby/core/string/dup_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#dup" do
   before :each do
diff --git a/spec/ruby/core/string/each_byte_spec.rb b/spec/ruby/core/string/each_byte_spec.rb
index 2282cd6d7a..e04dca807f 100644
--- a/spec/ruby/core/string/each_byte_spec.rb
+++ b/spec/ruby/core/string/each_byte_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#each_byte" do
   it "passes each byte in self to the given block" do
diff --git a/spec/ruby/core/string/each_char_spec.rb b/spec/ruby/core/string/each_char_spec.rb
index 4894c745c7..aff98c0a5c 100644
--- a/spec/ruby/core/string/each_char_spec.rb
+++ b/spec/ruby/core/string/each_char_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../shared/chars', __FILE__)
-require File.expand_path('../shared/each_char_without_block', __FILE__)
+require_relative 'shared/chars'
+require_relative 'shared/each_char_without_block'
 
 describe "String#each_char" do
   it_behaves_like :string_chars, :each_char
diff --git a/spec/ruby/core/string/each_codepoint_spec.rb b/spec/ruby/core/string/each_codepoint_spec.rb
index 3ad4b719fc..41ca527653 100644
--- a/spec/ruby/core/string/each_codepoint_spec.rb
+++ b/spec/ruby/core/string/each_codepoint_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../shared/codepoints', __FILE__)
-require File.expand_path('../shared/each_codepoint_without_block', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'shared/codepoints'
+require_relative 'shared/each_codepoint_without_block'
 
 with_feature :encoding do
   describe "String#each_codepoint" do
diff --git a/spec/ruby/core/string/each_line_spec.rb b/spec/ruby/core/string/each_line_spec.rb
index ede272a0a0..90fc920bf1 100644
--- a/spec/ruby/core/string/each_line_spec.rb
+++ b/spec/ruby/core/string/each_line_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/each_line', __FILE__)
-require File.expand_path('../shared/each_line_without_block', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/each_line'
+require_relative 'shared/each_line_without_block'
 
 describe "String#each_line" do
   it_behaves_like :string_each_line, :each_line
diff --git a/spec/ruby/core/string/element_reference_spec.rb b/spec/ruby/core/string/element_reference_spec.rb
index 785bbdaf80..f6e1750c93 100644
--- a/spec/ruby/core/string/element_reference_spec.rb
+++ b/spec/ruby/core/string/element_reference_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/slice.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/slice'
 
 describe "String#[]" do
   it_behaves_like :string_slice, :[]
diff --git a/spec/ruby/core/string/element_set_spec.rb b/spec/ruby/core/string/element_set_spec.rb
index 9c02afed8d..80ec5755c6 100644
--- a/spec/ruby/core/string/element_set_spec.rb
+++ b/spec/ruby/core/string/element_set_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 # TODO: Add missing String#[]= specs:
 #   String#[re, idx] = obj
diff --git a/spec/ruby/core/string/empty_spec.rb b/spec/ruby/core/string/empty_spec.rb
index c13e1145e4..fb52070723 100644
--- a/spec/ruby/core/string/empty_spec.rb
+++ b/spec/ruby/core/string/empty_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#empty?" do
   it "returns true if the string has a length of zero" do
diff --git a/spec/ruby/core/string/encode_spec.rb b/spec/ruby/core/string/encode_spec.rb
index 5b6fa7e50c..f582d50794 100644
--- a/spec/ruby/core/string/encode_spec.rb
+++ b/spec/ruby/core/string/encode_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../shared/encode', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'shared/encode'
 
 with_feature :encoding do
   describe "String#encode" do
diff --git a/spec/ruby/core/string/encoding_spec.rb b/spec/ruby/core/string/encoding_spec.rb
index 9c655757a8..b2861f2264 100644
--- a/spec/ruby/core/string/encoding_spec.rb
+++ b/spec/ruby/core/string/encoding_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: us-ascii -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/iso-8859-9-encoding', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/iso-8859-9-encoding'
 
 with_feature :encoding do
   describe "String#encoding" do
diff --git a/spec/ruby/core/string/end_with_spec.rb b/spec/ruby/core/string/end_with_spec.rb
index 2c3ff07272..7268378a38 100644
--- a/spec/ruby/core/string/end_with_spec.rb
+++ b/spec/ruby/core/string/end_with_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#end_with?" do
   it "returns true only if ends match" do
diff --git a/spec/ruby/core/string/eql_spec.rb b/spec/ruby/core/string/eql_spec.rb
index ccc0bcbaa8..397974d9fb 100644
--- a/spec/ruby/core/string/eql_spec.rb
+++ b/spec/ruby/core/string/eql_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../shared/eql', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'shared/eql'
 
 describe "String#eql?" do
   it_behaves_like :string_eql_value, :eql?
diff --git a/spec/ruby/core/string/equal_value_spec.rb b/spec/ruby/core/string/equal_value_spec.rb
index cec6843fe6..b9c9c372f8 100644
--- a/spec/ruby/core/string/equal_value_spec.rb
+++ b/spec/ruby/core/string/equal_value_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../shared/eql', __FILE__)
-require File.expand_path('../shared/equal_value', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'shared/eql'
+require_relative 'shared/equal_value'
 
 describe "String#==" do
   it_behaves_like :string_eql_value, :==
diff --git a/spec/ruby/core/string/force_encoding_spec.rb b/spec/ruby/core/string/force_encoding_spec.rb
index a2464dc904..c317c84c1f 100644
--- a/spec/ruby/core/string/force_encoding_spec.rb
+++ b/spec/ruby/core/string/force_encoding_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 with_feature :encoding do
   describe "String#force_encoding" do
diff --git a/spec/ruby/core/string/freeze_spec.rb b/spec/ruby/core/string/freeze_spec.rb
index 476f50fbed..04d1e9513c 100644
--- a/spec/ruby/core/string/freeze_spec.rb
+++ b/spec/ruby/core/string/freeze_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#freeze" do
 
diff --git a/spec/ruby/core/string/getbyte_spec.rb b/spec/ruby/core/string/getbyte_spec.rb
index b46ab1ab64..84286ada92 100644
--- a/spec/ruby/core/string/getbyte_spec.rb
+++ b/spec/ruby/core/string/getbyte_spec.rb
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#getbyte" do
   it "returns an Integer if given a valid index" do
diff --git a/spec/ruby/core/string/gsub_spec.rb b/spec/ruby/core/string/gsub_spec.rb
index 319dc2e3e1..a94010edea 100644
--- a/spec/ruby/core/string/gsub_spec.rb
+++ b/spec/ruby/core/string/gsub_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe :string_gsub_named_capture, shared: true do
   it "replaces \\k named backreferences with the regexp's corresponding capture" do
diff --git a/spec/ruby/core/string/hash_spec.rb b/spec/ruby/core/string/hash_spec.rb
index 255168cebd..0b26214b55 100644
--- a/spec/ruby/core/string/hash_spec.rb
+++ b/spec/ruby/core/string/hash_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#hash" do
   it "returns a hash based on a string's length and content" do
diff --git a/spec/ruby/core/string/hex_spec.rb b/spec/ruby/core/string/hex_spec.rb
index 8a9257c310..364e915681 100644
--- a/spec/ruby/core/string/hex_spec.rb
+++ b/spec/ruby/core/string/hex_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 # TODO: Move actual results to String#to_int() and spec in terms of it
 describe "String#hex" do
diff --git a/spec/ruby/core/string/include_spec.rb b/spec/ruby/core/string/include_spec.rb
index d7780de602..03ef3ba802 100644
--- a/spec/ruby/core/string/include_spec.rb
+++ b/spec/ruby/core/string/include_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#include? with String" do
   it "returns true if self contains other_str" do
diff --git a/spec/ruby/core/string/index_spec.rb b/spec/ruby/core/string/index_spec.rb
index 7889f69c5d..3ed27034e1 100644
--- a/spec/ruby/core/string/index_spec.rb
+++ b/spec/ruby/core/string/index_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#index" do
   it "raises a TypeError if passed nil" do
diff --git a/spec/ruby/core/string/initialize_spec.rb b/spec/ruby/core/string/initialize_spec.rb
index cbb281c8d5..08734cc916 100644
--- a/spec/ruby/core/string/initialize_spec.rb
+++ b/spec/ruby/core/string/initialize_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/replace', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/replace'
 
 describe "String#initialize" do
   it "is a private method" do
diff --git a/spec/ruby/core/string/insert_spec.rb b/spec/ruby/core/string/insert_spec.rb
index 8bae38f074..2c72bb5ffd 100644
--- a/spec/ruby/core/string/insert_spec.rb
+++ b/spec/ruby/core/string/insert_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
 
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#insert with index, other" do
   it "inserts other before the character at the given index" do
diff --git a/spec/ruby/core/string/inspect_spec.rb b/spec/ruby/core/string/inspect_spec.rb
index a3e18c0ee3..2cfcfe0e76 100644
--- a/spec/ruby/core/string/inspect_spec.rb
+++ b/spec/ruby/core/string/inspect_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#inspect" do
   it "taints the result if self is tainted" do
diff --git a/spec/ruby/core/string/intern_spec.rb b/spec/ruby/core/string/intern_spec.rb
index c0196f7e2c..cd7dad4359 100644
--- a/spec/ruby/core/string/intern_spec.rb
+++ b/spec/ruby/core/string/intern_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/to_sym.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/to_sym'
 
 describe "String#intern" do
   it_behaves_like :string_to_sym, :intern
diff --git a/spec/ruby/core/string/length_spec.rb b/spec/ruby/core/string/length_spec.rb
index 215b5ec854..98cee1f03d 100644
--- a/spec/ruby/core/string/length_spec.rb
+++ b/spec/ruby/core/string/length_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/length', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/length'
 
 describe "String#length" do
   it_behaves_like :string_length, :length
diff --git a/spec/ruby/core/string/lines_spec.rb b/spec/ruby/core/string/lines_spec.rb
index 111cc14508..6b2d74daf1 100644
--- a/spec/ruby/core/string/lines_spec.rb
+++ b/spec/ruby/core/string/lines_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/each_line', __FILE__)
-require File.expand_path('../shared/each_line_without_block', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/each_line'
+require_relative 'shared/each_line_without_block'
 
 describe "String#lines" do
   it_behaves_like :string_each_line, :lines
diff --git a/spec/ruby/core/string/ljust_spec.rb b/spec/ruby/core/string/ljust_spec.rb
index f66fb0c573..5838a0c9f9 100644
--- a/spec/ruby/core/string/ljust_spec.rb
+++ b/spec/ruby/core/string/ljust_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#ljust with length, padding" do
   it "returns a new string of specified length with self left justified and padded with padstr" do
diff --git a/spec/ruby/core/string/lstrip_spec.rb b/spec/ruby/core/string/lstrip_spec.rb
index b35e359928..ecfc89dd6b 100644
--- a/spec/ruby/core/string/lstrip_spec.rb
+++ b/spec/ruby/core/string/lstrip_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#lstrip" do
   it "returns a copy of self with leading whitespace removed" do
diff --git a/spec/ruby/core/string/match_spec.rb b/spec/ruby/core/string/match_spec.rb
index 94e28e7297..7f3d9ebae5 100644
--- a/spec/ruby/core/string/match_spec.rb
+++ b/spec/ruby/core/string/match_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe :string_match_escaped_literal, shared: true do
   not_supported_on :opal do
diff --git a/spec/ruby/core/string/modulo_spec.rb b/spec/ruby/core/string/modulo_spec.rb
index 7cb3561b17..e81b27e4ce 100644
--- a/spec/ruby/core/string/modulo_spec.rb
+++ b/spec/ruby/core/string/modulo_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../../../shared/hash/key_error', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative '../../shared/hash/key_error'
 
 describe "String#%" do
   context "when key is missing from passed-in hash" do
diff --git a/spec/ruby/core/string/multiply_spec.rb b/spec/ruby/core/string/multiply_spec.rb
index d932ebeb8e..7d887fd93a 100644
--- a/spec/ruby/core/string/multiply_spec.rb
+++ b/spec/ruby/core/string/multiply_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../../../shared/string/times', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative '../../shared/string/times'
 
 describe "String#*" do
   it_behaves_like :string_times, :*, ->(str, times) { str * times }
diff --git a/spec/ruby/core/string/new_spec.rb b/spec/ruby/core/string/new_spec.rb
index b429ac48d2..7d1c361bf8 100644
--- a/spec/ruby/core/string/new_spec.rb
+++ b/spec/ruby/core/string/new_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String.new" do
   it "returns an instance of String" do
diff --git a/spec/ruby/core/string/next_spec.rb b/spec/ruby/core/string/next_spec.rb
index 185f857cf0..fcd3e5ef90 100644
--- a/spec/ruby/core/string/next_spec.rb
+++ b/spec/ruby/core/string/next_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/succ.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/succ'
 
 describe "String#next" do
   it_behaves_like :string_succ, :next
diff --git a/spec/ruby/core/string/oct_spec.rb b/spec/ruby/core/string/oct_spec.rb
index 7cdbabc436..7637692217 100644
--- a/spec/ruby/core/string/oct_spec.rb
+++ b/spec/ruby/core/string/oct_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 # Note: We can't completely spec this in terms of to_int() because hex()
 # allows the base to be changed by a base specifier in the string.
diff --git a/spec/ruby/core/string/ord_spec.rb b/spec/ruby/core/string/ord_spec.rb
index 64466fde58..8ba110c973 100644
--- a/spec/ruby/core/string/ord_spec.rb
+++ b/spec/ruby/core/string/ord_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 with_feature :encoding do
   describe "String#ord" do
diff --git a/spec/ruby/core/string/partition_spec.rb b/spec/ruby/core/string/partition_spec.rb
index 04f49db1b1..f7ab5f85aa 100644
--- a/spec/ruby/core/string/partition_spec.rb
+++ b/spec/ruby/core/string/partition_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#partition with String" do
   it "returns an array of substrings based on splitting on the given string" do
diff --git a/spec/ruby/core/string/percent_spec.rb b/spec/ruby/core/string/percent_spec.rb
index 5eeb98c217..2ddcab7907 100644
--- a/spec/ruby/core/string/percent_spec.rb
+++ b/spec/ruby/core/string/percent_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../../kernel/shared/sprintf', __FILE__)
-require File.expand_path('../../kernel/shared/sprintf_encoding', __FILE__)
+require_relative '../../spec_helper'
+require_relative '../kernel/shared/sprintf'
+require_relative '../kernel/shared/sprintf_encoding'
 
 describe "String#%" do
   it_behaves_like :kernel_sprintf, -> (format, *args) {
diff --git a/spec/ruby/core/string/plus_spec.rb b/spec/ruby/core/string/plus_spec.rb
index addc8873eb..a9f287a82b 100644
--- a/spec/ruby/core/string/plus_spec.rb
+++ b/spec/ruby/core/string/plus_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/concat', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/concat'
 
 describe "String#+" do
   it "returns a new string containing the given string concatenated to self" do
diff --git a/spec/ruby/core/string/prepend_spec.rb b/spec/ruby/core/string/prepend_spec.rb
index 81618a4d7c..cbe83524b8 100644
--- a/spec/ruby/core/string/prepend_spec.rb
+++ b/spec/ruby/core/string/prepend_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#prepend" do
   it "prepends the given argument to self and returns self" do
diff --git a/spec/ruby/core/string/replace_spec.rb b/spec/ruby/core/string/replace_spec.rb
index 0f59a9a1ab..ef9bab4f3c 100644
--- a/spec/ruby/core/string/replace_spec.rb
+++ b/spec/ruby/core/string/replace_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
-require File.expand_path('../shared/replace', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/replace'
 
 describe "String#replace" do
   it_behaves_like :string_replace, :replace
diff --git a/spec/ruby/core/string/reverse_spec.rb b/spec/ruby/core/string/reverse_spec.rb
index 5b183fef4f..7cb171cb81 100644
--- a/spec/ruby/core/string/reverse_spec.rb
+++ b/spec/ruby/core/string/reverse_spec.rb
@@ -1,7 +1,7 @@
 # encoding: utf-8
 
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#reverse" do
   it "returns a new string with the characters of self in reverse order" do
diff --git a/spec/ruby/core/string/rindex_spec.rb b/spec/ruby/core/string/rindex_spec.rb
index 7085914189..98e36785e3 100644
--- a/spec/ruby/core/string/rindex_spec.rb
+++ b/spec/ruby/core/string/rindex_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../fixtures/utf-8-encoding.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'fixtures/utf-8-encoding'
 
 describe "String#rindex with object" do
   it "raises a TypeError if obj isn't a String, Fixnum or Regexp" do
diff --git a/spec/ruby/core/string/rjust_spec.rb b/spec/ruby/core/string/rjust_spec.rb
index 85cb1fe213..c2cfae7b66 100644
--- a/spec/ruby/core/string/rjust_spec.rb
+++ b/spec/ruby/core/string/rjust_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#rjust with length, padding" do
   it "returns a new string of specified length with self right justified and padded with padstr" do
diff --git a/spec/ruby/core/string/rpartition_spec.rb b/spec/ruby/core/string/rpartition_spec.rb
index c58d96f298..a5222e0a2a 100644
--- a/spec/ruby/core/string/rpartition_spec.rb
+++ b/spec/ruby/core/string/rpartition_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#rpartition with String" do
   it "returns an array of substrings based on splitting on the given string" do
diff --git a/spec/ruby/core/string/rstrip_spec.rb b/spec/ruby/core/string/rstrip_spec.rb
index aa3f70a166..6376e5df33 100644
--- a/spec/ruby/core/string/rstrip_spec.rb
+++ b/spec/ruby/core/string/rstrip_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#rstrip" do
   it "returns a copy of self with trailing whitespace removed" do
diff --git a/spec/ruby/core/string/scan_spec.rb b/spec/ruby/core/string/scan_spec.rb
index f09daa1b74..64a1c31443 100644
--- a/spec/ruby/core/string/scan_spec.rb
+++ b/spec/ruby/core/string/scan_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#scan" do
   it "returns an array containing all matches" do
diff --git a/spec/ruby/core/string/scrub_spec.rb b/spec/ruby/core/string/scrub_spec.rb
index 815eb0fbb7..92e7641f0b 100644
--- a/spec/ruby/core/string/scrub_spec.rb
+++ b/spec/ruby/core/string/scrub_spec.rb
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path("../../../spec_helper", __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#scrub with a default replacement" do
   it "returns self for valid strings" do
diff --git a/spec/ruby/core/string/setbyte_spec.rb b/spec/ruby/core/string/setbyte_spec.rb
index e27ab38d67..f998e61622 100644
--- a/spec/ruby/core/string/setbyte_spec.rb
+++ b/spec/ruby/core/string/setbyte_spec.rb
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#setbyte" do
   it "returns an Integer" do
diff --git a/spec/ruby/core/string/shared/chars.rb b/spec/ruby/core/string/shared/chars.rb
index c1cf324dc5..6a2fdb483f 100644
--- a/spec/ruby/core/string/shared/chars.rb
+++ b/spec/ruby/core/string/shared/chars.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
 
 describe :string_chars, shared: true do
   it "passes each char in self to the given block" do
diff --git a/spec/ruby/core/string/shared/each_char_without_block.rb b/spec/ruby/core/string/shared/each_char_without_block.rb
index 40808cfd9f..397100ce0e 100644
--- a/spec/ruby/core/string/shared/each_char_without_block.rb
+++ b/spec/ruby/core/string/shared/each_char_without_block.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
 
 describe :string_each_char_without_block, shared: true do
   describe "when no block is given" do
diff --git a/spec/ruby/core/string/shared/eql.rb b/spec/ruby/core/string/shared/eql.rb
index 92dfa91923..85b861f4f1 100644
--- a/spec/ruby/core/string/shared/eql.rb
+++ b/spec/ruby/core/string/shared/eql.rb
@@ -1,6 +1,6 @@
 # -*- encoding: binary -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
 
 describe :string_eql_value, shared: true do
   it "returns true if self <=> string returns 0" do
diff --git a/spec/ruby/core/string/shared/equal_value.rb b/spec/ruby/core/string/shared/equal_value.rb
index 6df76478c7..d797cb1483 100644
--- a/spec/ruby/core/string/shared/equal_value.rb
+++ b/spec/ruby/core/string/shared/equal_value.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
 
 describe :string_equal_value, shared: true do
   it "returns false if obj does not respond to to_str" do
diff --git a/spec/ruby/core/string/size_spec.rb b/spec/ruby/core/string/size_spec.rb
index 7e1afd9c54..9e1f40c5ae 100644
--- a/spec/ruby/core/string/size_spec.rb
+++ b/spec/ruby/core/string/size_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/length', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/length'
 
 describe "String#size" do
   it_behaves_like :string_length, :size
diff --git a/spec/ruby/core/string/slice_spec.rb b/spec/ruby/core/string/slice_spec.rb
index fce64bd382..12876e757d 100644
--- a/spec/ruby/core/string/slice_spec.rb
+++ b/spec/ruby/core/string/slice_spec.rb
@@ -1,8 +1,8 @@
 # -*- encoding: utf-8 -*-
 
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/slice.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/slice'
 
 describe "String#slice" do
   it_behaves_like :string_slice, :slice
diff --git a/spec/ruby/core/string/split_spec.rb b/spec/ruby/core/string/split_spec.rb
index 1a4128f828..0d2c6211c4 100644
--- a/spec/ruby/core/string/split_spec.rb
+++ b/spec/ruby/core/string/split_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#split with String" do
   with_feature :encoding do
diff --git a/spec/ruby/core/string/squeeze_spec.rb b/spec/ruby/core/string/squeeze_spec.rb
index 01b9fe72ff..391b356227 100644
--- a/spec/ruby/core/string/squeeze_spec.rb
+++ b/spec/ruby/core/string/squeeze_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: binary -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 # TODO: rewrite all these specs
 
diff --git a/spec/ruby/core/string/start_with_spec.rb b/spec/ruby/core/string/start_with_spec.rb
index cba40d70f1..4e12c1a445 100644
--- a/spec/ruby/core/string/start_with_spec.rb
+++ b/spec/ruby/core/string/start_with_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#start_with?" do
   it "returns true only if beginning match" do
diff --git a/spec/ruby/core/string/string_spec.rb b/spec/ruby/core/string/string_spec.rb
index 37a858acae..cdefbbecbd 100644
--- a/spec/ruby/core/string/string_spec.rb
+++ b/spec/ruby/core/string/string_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String" do
   it "includes Comparable" do
diff --git a/spec/ruby/core/string/strip_spec.rb b/spec/ruby/core/string/strip_spec.rb
index 36eb38e4e4..54dec794fa 100644
--- a/spec/ruby/core/string/strip_spec.rb
+++ b/spec/ruby/core/string/strip_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#strip" do
   it "returns a new string with leading and trailing whitespace removed" do
diff --git a/spec/ruby/core/string/sub_spec.rb b/spec/ruby/core/string/sub_spec.rb
index ceda4ec794..901d1596c5 100644
--- a/spec/ruby/core/string/sub_spec.rb
+++ b/spec/ruby/core/string/sub_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#sub with pattern, replacement" do
   it "returns a copy of self when no modification is made" do
diff --git a/spec/ruby/core/string/succ_spec.rb b/spec/ruby/core/string/succ_spec.rb
index 52b5a6c1ee..65047e0aa2 100644
--- a/spec/ruby/core/string/succ_spec.rb
+++ b/spec/ruby/core/string/succ_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/succ.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/succ'
 
 describe "String#succ" do
   it_behaves_like :string_succ, :succ
diff --git a/spec/ruby/core/string/sum_spec.rb b/spec/ruby/core/string/sum_spec.rb
index 2d68668f49..c283b7c254 100644
--- a/spec/ruby/core/string/sum_spec.rb
+++ b/spec/ruby/core/string/sum_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#sum" do
   it "returns a basic n-bit checksum of the characters in self" do
diff --git a/spec/ruby/core/string/swapcase_spec.rb b/spec/ruby/core/string/swapcase_spec.rb
index d9127856d3..6d00906aad 100644
--- a/spec/ruby/core/string/swapcase_spec.rb
+++ b/spec/ruby/core/string/swapcase_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#swapcase" do
   it "returns a new string with all uppercase chars from self converted to lowercase and vice versa" do
diff --git a/spec/ruby/core/string/to_c_spec.rb b/spec/ruby/core/string/to_c_spec.rb
index da353e18d5..9c84b14f4d 100644
--- a/spec/ruby/core/string/to_c_spec.rb
+++ b/spec/ruby/core/string/to_c_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#to_c" do
   it "returns a Complex object" do
diff --git a/spec/ruby/core/string/to_f_spec.rb b/spec/ruby/core/string/to_f_spec.rb
index 8454651ab2..ca8536c30e 100644
--- a/spec/ruby/core/string/to_f_spec.rb
+++ b/spec/ruby/core/string/to_f_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 # src.scan(/[+-]?[\d_]+\.[\d_]+(e[+-]?[\d_]+)?\b|[+-]?[\d_]+e[+-]?[\d_]+\b/i)
 
diff --git a/spec/ruby/core/string/to_i_spec.rb b/spec/ruby/core/string/to_i_spec.rb
index be0f67a46a..f86d3a43a7 100644
--- a/spec/ruby/core/string/to_i_spec.rb
+++ b/spec/ruby/core/string/to_i_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#to_i" do
   it "returns 0 for strings with leading underscores" do
diff --git a/spec/ruby/core/string/to_r_spec.rb b/spec/ruby/core/string/to_r_spec.rb
index 7fa16f6f49..9f174a2f55 100644
--- a/spec/ruby/core/string/to_r_spec.rb
+++ b/spec/ruby/core/string/to_r_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#to_r" do
   it "returns a Rational object" do
diff --git a/spec/ruby/core/string/to_s_spec.rb b/spec/ruby/core/string/to_s_spec.rb
index 8551b080a6..e5872745a8 100644
--- a/spec/ruby/core/string/to_s_spec.rb
+++ b/spec/ruby/core/string/to_s_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/to_s.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/to_s'
 
 describe "String#to_s" do
   it_behaves_like :string_to_s, :to_s
diff --git a/spec/ruby/core/string/to_str_spec.rb b/spec/ruby/core/string/to_str_spec.rb
index a326b52bca..e24262a7ae 100644
--- a/spec/ruby/core/string/to_str_spec.rb
+++ b/spec/ruby/core/string/to_str_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/to_s.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/to_s'
 
 describe "String#to_str" do
   it_behaves_like :string_to_s, :to_str
diff --git a/spec/ruby/core/string/to_sym_spec.rb b/spec/ruby/core/string/to_sym_spec.rb
index cb41afc636..f9135211ce 100644
--- a/spec/ruby/core/string/to_sym_spec.rb
+++ b/spec/ruby/core/string/to_sym_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
-require File.expand_path('../shared/to_sym.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
+require_relative 'shared/to_sym'
 
 describe "String#to_sym" do
   it_behaves_like :string_to_sym, :to_sym
diff --git a/spec/ruby/core/string/tr_s_spec.rb b/spec/ruby/core/string/tr_s_spec.rb
index e387ea2356..87635acf2c 100644
--- a/spec/ruby/core/string/tr_s_spec.rb
+++ b/spec/ruby/core/string/tr_s_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#tr_s" do
   it "returns a string processed according to tr with newly duplicate characters removed" do
diff --git a/spec/ruby/core/string/tr_spec.rb b/spec/ruby/core/string/tr_spec.rb
index 55556c6e4f..efd5a7f638 100644
--- a/spec/ruby/core/string/tr_spec.rb
+++ b/spec/ruby/core/string/tr_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#tr" do
   it "returns a new string with the characters from from_string replaced by the ones in to_string" do
diff --git a/spec/ruby/core/string/try_convert_spec.rb b/spec/ruby/core/string/try_convert_spec.rb
index ce12839c59..629817110e 100644
--- a/spec/ruby/core/string/try_convert_spec.rb
+++ b/spec/ruby/core/string/try_convert_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String.try_convert" do
   it "returns the argument if it's a String" do
diff --git a/spec/ruby/core/string/uminus_spec.rb b/spec/ruby/core/string/uminus_spec.rb
index f18e6b1234..a2b6fad098 100644
--- a/spec/ruby/core/string/uminus_spec.rb
+++ b/spec/ruby/core/string/uminus_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 ruby_version_is "2.3" do
   describe 'String#-@' do
diff --git a/spec/ruby/core/string/unicode_normalize_spec.rb b/spec/ruby/core/string/unicode_normalize_spec.rb
index 138c0455fd..7a4662e0b8 100644
--- a/spec/ruby/core/string/unicode_normalize_spec.rb
+++ b/spec/ruby/core/string/unicode_normalize_spec.rb
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 # Examples taken from http://www.unicode.org/reports/tr15/#Norm_Forms
 
diff --git a/spec/ruby/core/string/unicode_normalized_spec.rb b/spec/ruby/core/string/unicode_normalized_spec.rb
index dc5e2742e4..d383c0a91e 100644
--- a/spec/ruby/core/string/unicode_normalized_spec.rb
+++ b/spec/ruby/core/string/unicode_normalized_spec.rb
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "String#unicode_normalized?" do
   before :each do
diff --git a/spec/ruby/core/string/unpack/a_spec.rb b/spec/ruby/core/string/unpack/a_spec.rb
index 18882c91a6..0adcf0ff80 100644
--- a/spec/ruby/core/string/unpack/a_spec.rb
+++ b/spec/ruby/core/string/unpack/a_spec.rb
@@ -1,8 +1,8 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/string', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/string'
 
 describe "String#unpack with format 'A'" do
   it_behaves_like :string_unpack_basic, 'A'
diff --git a/spec/ruby/core/string/unpack/at_spec.rb b/spec/ruby/core/string/unpack/at_spec.rb
index 70cbebd2ba..a5f97b64f0 100644
--- a/spec/ruby/core/string/unpack/at_spec.rb
+++ b/spec/ruby/core/string/unpack/at_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
 
 describe "String#unpack with format '@'" do
   it_behaves_like :string_unpack_basic, '@'
diff --git a/spec/ruby/core/string/unpack/b_spec.rb b/spec/ruby/core/string/unpack/b_spec.rb
index fa632e6526..332c85b5f8 100644
--- a/spec/ruby/core/string/unpack/b_spec.rb
+++ b/spec/ruby/core/string/unpack/b_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
 
 describe "String#unpack with format 'B'" do
   it_behaves_like :string_unpack_basic, 'B'
diff --git a/spec/ruby/core/string/unpack/c_spec.rb b/spec/ruby/core/string/unpack/c_spec.rb
index 36de462cac..82c0f8616d 100644
--- a/spec/ruby/core/string/unpack/c_spec.rb
+++ b/spec/ruby/core/string/unpack/c_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
 
 describe :string_unpack_8bit, shared: true do
   it "decodes one byte for a single format character" do
diff --git a/spec/ruby/core/string/unpack/comment_spec.rb b/spec/ruby/core/string/unpack/comment_spec.rb
index 884960b337..7e7adbf54f 100644
--- a/spec/ruby/core/string/unpack/comment_spec.rb
+++ b/spec/ruby/core/string/unpack/comment_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
 
 describe "String#unpack" do
   it "ignores directives text from '#' to the first newline" do
diff --git a/spec/ruby/core/string/unpack/d_spec.rb b/spec/ruby/core/string/unpack/d_spec.rb
index db4638f8ef..0e4f57ec04 100644
--- a/spec/ruby/core/string/unpack/d_spec.rb
+++ b/spec/ruby/core/string/unpack/d_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/float', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/float'
 
 little_endian do
   describe "String#unpack with format 'D'" do
diff --git a/spec/ruby/core/string/unpack/e_spec.rb b/spec/ruby/core/string/unpack/e_spec.rb
index cb74c00206..c958be1c8b 100644
--- a/spec/ruby/core/string/unpack/e_spec.rb
+++ b/spec/ruby/core/string/unpack/e_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/float', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/float'
 
 describe "String#unpack with format 'E'" do
   it_behaves_like :string_unpack_basic, 'E'
diff --git a/spec/ruby/core/string/unpack/f_spec.rb b/spec/ruby/core/string/unpack/f_spec.rb
index 60dad46703..ec8b9d435e 100644
--- a/spec/ruby/core/string/unpack/f_spec.rb
+++ b/spec/ruby/core/string/unpack/f_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/float', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/float'
 
 little_endian do
   describe "String#unpack with format 'F'" do
diff --git a/spec/ruby/core/string/unpack/g_spec.rb b/spec/ruby/core/string/unpack/g_spec.rb
index f5bec1534e..ffc423b152 100644
--- a/spec/ruby/core/string/unpack/g_spec.rb
+++ b/spec/ruby/core/string/unpack/g_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/float', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/float'
 
 describe "String#unpack with format 'G'" do
   it_behaves_like :string_unpack_basic, 'G'
diff --git a/spec/ruby/core/string/unpack/h_spec.rb b/spec/ruby/core/string/unpack/h_spec.rb
index 00d6d68eee..7d0acf5718 100644
--- a/spec/ruby/core/string/unpack/h_spec.rb
+++ b/spec/ruby/core/string/unpack/h_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
 
 describe "String#unpack with format 'H'" do
   it_behaves_like :string_unpack_basic, 'H'
diff --git a/spec/ruby/core/string/unpack/i_spec.rb b/spec/ruby/core/string/unpack/i_spec.rb
index f3183afe99..b4bbba1923 100644
--- a/spec/ruby/core/string/unpack/i_spec.rb
+++ b/spec/ruby/core/string/unpack/i_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/integer', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/integer'
 
 describe "String#unpack with format 'I'" do
   describe "with modifier '<'" do
diff --git a/spec/ruby/core/string/unpack/j_spec.rb b/spec/ruby/core/string/unpack/j_spec.rb
index 23d26d896e..8f4213bd97 100644
--- a/spec/ruby/core/string/unpack/j_spec.rb
+++ b/spec/ruby/core/string/unpack/j_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/integer', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/integer'
 
 ruby_version_is '2.3' do
   platform_is pointer_size: 64 do
diff --git a/spec/ruby/core/string/unpack/l_spec.rb b/spec/ruby/core/string/unpack/l_spec.rb
index 11f0648fc7..6f9fcd4fd0 100644
--- a/spec/ruby/core/string/unpack/l_spec.rb
+++ b/spec/ruby/core/string/unpack/l_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/integer', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/integer'
 
 describe "String#unpack with format 'L'" do
   describe "with modifier '<'" do
diff --git a/spec/ruby/core/string/unpack/m_spec.rb b/spec/ruby/core/string/unpack/m_spec.rb
index 104f282fed..0ae1118583 100644
--- a/spec/ruby/core/string/unpack/m_spec.rb
+++ b/spec/ruby/core/string/unpack/m_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
 
 describe "String#unpack with format 'M'" do
   it_behaves_like :string_unpack_basic, 'M'
diff --git a/spec/ruby/core/string/unpack/n_spec.rb b/spec/ruby/core/string/unpack/n_spec.rb
index 6e85346338..09173f4fcb 100644
--- a/spec/ruby/core/string/unpack/n_spec.rb
+++ b/spec/ruby/core/string/unpack/n_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/integer', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/integer'
 
 describe "String#unpack with format 'N'" do
   it_behaves_like :string_unpack_basic, 'N'
diff --git a/spec/ruby/core/string/unpack/p_spec.rb b/spec/ruby/core/string/unpack/p_spec.rb
index 7c9a502a15..57b51fef00 100644
--- a/spec/ruby/core/string/unpack/p_spec.rb
+++ b/spec/ruby/core/string/unpack/p_spec.rb
@@ -1,6 +1,6 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
 
 describe "String#unpack with format 'P'" do
   it_behaves_like :string_unpack_basic, 'P'
diff --git a/spec/ruby/core/string/unpack/percent_spec.rb b/spec/ruby/core/string/unpack/percent_spec.rb
index 38cf81b037..f0684d4cbc 100644
--- a/spec/ruby/core/string/unpack/percent_spec.rb
+++ b/spec/ruby/core/string/unpack/percent_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
+require_relative '../../../spec_helper'
 
 describe "String#unpack with format '%'" do
   it "raises an Argument Error" do
diff --git a/spec/ruby/core/string/unpack/q_spec.rb b/spec/ruby/core/string/unpack/q_spec.rb
index 91e65a9405..2f667d6c4d 100644
--- a/spec/ruby/core/string/unpack/q_spec.rb
+++ b/spec/ruby/core/string/unpack/q_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/integer', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/integer'
 
 describe "String#unpack with format 'Q'" do
   describe "with modifier '<'" do
diff --git a/spec/ruby/core/string/unpack/s_spec.rb b/spec/ruby/core/string/unpack/s_spec.rb
index c6b079b0a6..d331fd720e 100644
--- a/spec/ruby/core/string/unpack/s_spec.rb
+++ b/spec/ruby/core/string/unpack/s_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/integer', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/integer'
 
 describe "String#unpack with format 'S'" do
   describe "with modifier '<'" do
diff --git a/spec/ruby/core/string/unpack/u_spec.rb b/spec/ruby/core/string/unpack/u_spec.rb
index 0765da8d96..6326bd7963 100644
--- a/spec/ruby/core/string/unpack/u_spec.rb
+++ b/spec/ruby/core/string/unpack/u_spec.rb
@@ -1,8 +1,8 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/unicode', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/unicode'
 
 describe "String#unpack with format 'U'" do
   it_behaves_like :string_unpack_basic, 'U'
diff --git a/spec/ruby/core/string/unpack/v_spec.rb b/spec/ruby/core/string/unpack/v_spec.rb
index 33cf23c68b..929e8712cb 100644
--- a/spec/ruby/core/string/unpack/v_spec.rb
+++ b/spec/ruby/core/string/unpack/v_spec.rb
@@ -1,7 +1,7 @@
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/integer', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/integer'
 
 describe "String#unpack with format 'V'" do
   it_behaves_like :string_unpack_basic, 'V'
diff --git a/spec/ruby/core/string/unpack/w_spec.rb b/spec/ruby/core/string/unpack/w_spec.rb
index 22f5980a46..8ff926783e 100644
--- a/spec/ruby/core/string/unpack/w_spec.rb
+++ b/spec/ruby/core/string/unpack/w_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
 
 describe "String#unpack with directive 'w'" do
   it_behaves_like :string_unpack_basic, 'w'
diff --git a/spec/ruby/core/string/unpack/x_spec.rb b/spec/ruby/core/string/unpack/x_spec.rb
index e765472413..22b641b732 100644
--- a/spec/ruby/core/string/unpack/x_spec.rb
+++ b/spec/ruby/core/string/unpack/x_spec.rb
@@ -1,7 +1,7 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
 
 describe "String#unpack with format 'X'" do
   it_behaves_like :string_unpack_basic, 'X'
diff --git a/spec/ruby/core/string/unpack/z_spec.rb b/spec/ruby/core/string/unpack/z_spec.rb
index 7c3d167ac2..67d36ac8bf 100644
--- a/spec/ruby/core/string/unpack/z_spec.rb
+++ b/spec/ruby/core/string/unpack/z_spec.rb
@@ -1,8 +1,8 @@
 # -*- encoding: ascii-8bit -*-
-require File.expand_path('../../../../spec_helper', __FILE__)
-require File.expand_path('../../fixtures/classes', __FILE__)
-require File.expand_path('../shared/basic', __FILE__)
-require File.expand_path('../shared/string', __FILE__)
+require_relative '../../../spec_helper'
+require_relative '../fixtures/classes'
+require_relative 'shared/basic'
+require_relative 'shared/string'
 
 describe "String#unpack with format 'Z'" do
   it_behaves_like :string_unpack_basic, 'Z'
diff --git a/spec/ruby/core/string/unpack1_spec.rb b/spec/ruby/core/string/unpack1_spec.rb
index 6941bc1173..5b2157d85a 100644
--- a/spec/ruby/core/string/unpack1_spec.rb
+++ b/spec/ruby/core/string/unpack1_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 ruby_version_is "2.4" do
   describe "String#unpack1" do
diff --git a/spec/ruby/core/string/upcase_spec.rb b/spec/ruby/core/string/upcase_spec.rb
index 31fd7fb8da..001cf1f495 100644
--- a/spec/ruby/core/string/upcase_spec.rb
+++ b/spec/ruby/core/string/upcase_spec.rb
@@ -1,6 +1,6 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#upcase" do
   it "returns a copy of self with all lowercase letters upcased" do
diff --git a/spec/ruby/core/string/uplus_spec.rb b/spec/ruby/core/string/uplus_spec.rb
index eafa721903..6c6792590e 100644
--- a/spec/ruby/core/string/uplus_spec.rb
+++ b/spec/ruby/core/string/uplus_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 ruby_version_is "2.3" do
   describe 'String#+@' do
diff --git a/spec/ruby/core/string/upto_spec.rb b/spec/ruby/core/string/upto_spec.rb
index 6b998eed3c..d2f1121360 100644
--- a/spec/ruby/core/string/upto_spec.rb
+++ b/spec/ruby/core/string/upto_spec.rb
@@ -1,5 +1,5 @@
-require File.expand_path('../../../spec_helper', __FILE__)
-require File.expand_path('../fixtures/classes.rb', __FILE__)
+require_relative '../../spec_helper'
+require_relative 'fixtures/classes'
 
 describe "String#upto" do
   it "passes successive values, starting at self and ending at other_string, to the block" do
diff --git a/spec/ruby/core/string/valid_encoding_spec.rb b/spec/ruby/core/string/valid_encoding_spec.rb
index ddd0fe52a2..c8cbbcf5ec 100644
--- a/spec/ruby/core/string/valid_encoding_spec.rb
+++ b/spec/ruby/core/string/valid_encoding_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 with_feature :encoding do
   describe "String#valid_encoding?" do