Make TEST_FILES take a comma list of files.

Author: metaskills

Rakefile

@@ -11,7 +11,7 @@ def test_libs(mode='dblib')
 end
 
 def test_files
-  return Dir.glob(ENV['TEST_FILES']).sort if ENV['TEST_FILES']
+  return ENV['TEST_FILES'].split(',').sort if ENV['TEST_FILES']
   files = Dir.glob("test/cases/**/*_test_sqlserver.rb").sort
   ar_path = Gem.loaded_specs['activerecord'].full_gem_path
   ar_cases = Dir.glob("#{ar_path}/test/cases/**/*_test.rb")