no need to escape the method in a regex wrap, minitest does that for us

railties/lib/rails/commands/test.rb

@@ -10,7 +10,7 @@ $runner = Rails::TestRunner.new(options)
 def Minitest.plugin_rails_init(options)
   self.reporter << Rails::TestUnitReporter.new(options[:io], options)
   if method = $runner.find_method
-    options[:filter] = "/^(#{method})$/"
+    options[:filter] = method
   end
 end
 Minitest.extensions << 'rails'