--- a/test/lib/helper.rb
+++ b/test/lib/helper.rb
@@ -1,3 +1,4 @@
+=begin
 require "simplecov"
 
 # Cannot use ".simplecov" file: simplecov-json triggers a circular require.
@@ -26,6 +27,7 @@
   add_group "StringPrep", %w[lib/net/imap/stringprep.rb
                              lib/net/imap/stringprep]
 end
+=end
 require "test/unit"
 require "core_assertions"