Fixed the regression of #388

hsbt · hsbt · commit 85c55b49a1ea · 2021-07-08T14:46:17.000+09:00
diff --git a/lib/rake/rake_test_loader.rb b/lib/rake/rake_test_loader.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require "rake/file_list"
+
 # Load the test files from the command line.
 argv = ARGV.select do |argument|
   case argument
