Fix Performance/StringInclude cop.

.rubocop_todo.yml

@@ -63,13 +63,6 @@ Performance/RegexpMatch:
     - 'test/file_test.rb'
     - 'test/gentestfiles.rb'
 
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: AutoCorrect.
-Performance/StringInclude:
-  Exclude:
-    - 'test/file_test.rb'
-
 # Offense count: 7
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle.

test/file_test.rb

@@ -699,14 +699,14 @@ class ZipFileTest < MiniTest::Test
     File.open(zname, 'rb') do |f|
       Zip::File.open_buffer(f) do |zipfile|
         zipfile.each do |entry|
-          next unless entry.name =~ /README.md/
+          next unless entry.name.include?('README.md')
 
           data = zipfile.read(entry)
         end
       end
     end
     assert data
-    assert data =~ /Simonov/
+    assert data.include?('Simonov')
   end
 
   def test_nonexistant_zip