1 files changed, 117 insertions, 0 deletions

diff --git a/spec/ruby/core/string/delete_spec.rb b/spec/ruby/core/string/delete_spec.rb
new file mode 100644
index 0000000000..adb5150cff
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+++ b/spec/ruby/core/string/delete_spec.rb
@@ -0,0 +1,117 @@
+# -*- encoding: utf-8 -*-
+# frozen_string_literal: false
+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
+    s = "hello"
+    s.delete("lo").should == "he"
+    s.should == "hello"
+
+    "hello".delete("l", "lo").should == "heo"
+
+    "hell yeah".delete("").should == "hell yeah"
+  end
+
+  it "raises an ArgumentError when given no arguments" do
+    -> { "hell yeah".delete }.should.raise(ArgumentError)
+  end
+
+  it "negates sets starting with ^" do
+    "hello".delete("aeiou", "^e").should == "hell"
+    "hello".delete("^leh").should == "hell"
+    "hello".delete("^o").should == "o"
+    "hello".delete("^").should == "hello"
+    "^_^".delete("^^").should == "^^"
+    "oa^_^o".delete("a^").should == "o_o"
+  end
+
+  it "deletes all chars in a sequence" do
+    "hello".delete("ej-m").should == "ho"
+    "hello".delete("e-h").should == "llo"
+    "hel-lo".delete("e-").should == "hllo"
+    "hel-lo".delete("-h").should == "ello"
+    "hel-lo".delete("---").should == "hello"
+    "hel-012".delete("--2").should == "hel"
+    "hel-()".delete("(--").should == "hel"
+    "hello".delete("^e-h").should == "he"
+    "hello^".delete("^^-^").should == "^"
+    "hel--lo".delete("^---").should == "--"
+
+    "abcdefgh".delete("a-ce-fh").should == "dg"
+    "abcdefgh".delete("he-fa-c").should == "dg"
+    "abcdefgh".delete("e-fha-c").should == "dg"
+
+    "abcde".delete("ac-e").should == "b"
+    "abcde".delete("^ac-e").should == "acde"
+
+    "ABCabc[]".delete("A-a").should == "bc"
+  end
+
+  it "deletes multibyte characters" do
+    "四月".delete("月").should == "四"
+    '哥哥我倒'.delete('哥').should == "我倒"
+  end
+
+  it "respects backslash for escaping a -" do
+    'Non-Authoritative Information'.delete(' \-\'').should ==
+      'NonAuthoritativeInformation'
+  end
+
+  it "raises if the given ranges are invalid" do
+    not_supported_on :opal do
+      xFF = [0xFF].pack('C')
+      range = "\x00 - #{xFF}".force_encoding('utf-8')
+      -> { "hello".delete(range).should == "" }.should.raise(ArgumentError)
+    end
+    -> { "hello".delete("h-e") }.should.raise(ArgumentError)
+    -> { "hello".delete("^h-e") }.should.raise(ArgumentError)
+  end
+
+  it "tries to convert each set arg to a string using to_str" do
+    other_string = mock('lo')
+    other_string.should_receive(:to_str).and_return("lo")
+
+    other_string2 = mock('o')
+    other_string2.should_receive(:to_str).and_return("o")
+
+    "hello world".delete(other_string, other_string2).should == "hell wrld"
+  end
+
+  it "raises a TypeError when one set arg can't be converted to a string" do
+    -> { "hello world".delete(100)       }.should.raise(TypeError)
+    -> { "hello world".delete([])        }.should.raise(TypeError)
+    -> { "hello world".delete(mock('x')) }.should.raise(TypeError)
+  end
+
+  it "returns String instances when called on a subclass" do
+    StringSpecs::MyString.new("oh no!!!").delete("!").should.instance_of?(String)
+  end
+
+  it "returns a String in the same encoding as self" do
+    "hello".encode("US-ASCII").delete("lo").encoding.should == Encoding::US_ASCII
+  end
+end
+
+describe "String#delete!" do
+  it "modifies self in place and returns self" do
+    a = "hello"
+    a.delete!("aeiou", "^e").should.equal?(a)
+    a.should == "hell"
+  end
+
+  it "returns nil if no modifications were made" do
+    a = "hello"
+    a.delete!("z").should == nil
+    a.should == "hello"
+  end
+
+  it "raises a FrozenError when self is frozen" do
+    a = "hello"
+    a.freeze
+
+    -> { a.delete!("")            }.should.raise(FrozenError)
+    -> { a.delete!("aeiou", "^e") }.should.raise(FrozenError)
+  end
+end