Use `end_with?` instead of Regexp with missing escape

1 files changed, 1 insertions, 1 deletions

diff --git a/tool/lib/test/unit.rb b/tool/lib/test/unit.rb
index 8832022fbe..2d5a32ed67 100644
--- a/tool/lib/test/unit.rb
+++ b/tool/lib/test/unit.rb
@@ -872,7 +872,7 @@ module Test
           return File.join(File.dirname(f), basename+'.rb')
         elsif /\Atest_/ !~ basename
           return File.join(File.dirname(f), 'test_'+basename)
-        end if /#{basename}\z/ =~ f # otherwise basename is dirname/
+        end if f.end_with?(basename) # otherwise basename is dirname/
 
         raise ArgumentError, "file not found: #{orig_f}"
       end