Prefer to use File.readlines instead of IO.readlines

3 files changed, 3 insertions, 3 deletions

diff --git a/test/ruby/enc/test_regex_casefold.rb b/test/ruby/enc/test_regex_casefold.rb
index eaabbc58a2..b5d5c6e337 100644
--- a/test/ruby/enc/test_regex_casefold.rb
+++ b/test/ruby/enc/test_regex_casefold.rb
@@ -19,7 +19,7 @@ class TestCaseFold < Test::Unit::TestCase
   end
 
   def read_tests
-    IO.readlines("#{UNICODE_DATA_PATH}/CaseFolding.txt", encoding: Encoding::ASCII_8BIT)
+    File.readlines("#{UNICODE_DATA_PATH}/CaseFolding.txt", encoding: Encoding::ASCII_8BIT)
     .collect.with_index { |linedata, linenumber| [linenumber.to_i+1, linedata.chomp] }
     .reject { |number, data| data =~ /^(#|$)/ }
     .collect do |linenumber, linedata|
diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index c2eada0bfb..51abfee18a 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -1266,7 +1266,7 @@ $stderr = $stdout; raise "\x82\xa0"') do |outs, errs, status|
     begin;
       class Bug < RuntimeError
         def backtrace
-          IO.readlines(IO::NULL)
+          File.readlines(IO::NULL)
         end
       end
       bug = Bug.new '[ruby-core:85939] [Bug #14577]'
diff --git a/test/test_unicode_normalize.rb b/test/test_unicode_normalize.rb
index 034d71d808..8789ed92d2 100644
--- a/test/test_unicode_normalize.rb
+++ b/test/test_unicode_normalize.rb
@@ -24,7 +24,7 @@ class TestUnicodeNormalize
   NormTest = Struct.new :source, :NFC, :NFD, :NFKC, :NFKD, :line
 
   def self.read_tests
-    lines = IO.readlines(expand_filename('NormalizationTest'), encoding: 'utf-8')
+    lines = File.readlines(expand_filename('NormalizationTest'), encoding: 'utf-8')
     firstline = lines.shift
     define_method "test_0_normalizationtest_firstline" do
       assert_include(firstline, "NormalizationTest-#{UNICODE_VERSION}.txt")