Only add to test director if option is true

Author: rafaelfranca

railties/lib/rails/code_statistics.rb

@@ -54,7 +54,7 @@ class CodeStatistics
     #   Rails::CodeStatistics.register_directory("Model specs", "spec/models", test_directory: true)
     def self.register_directory(label, path, test_directory: false)
       self.directories << [label, path]
-      self.test_types << label
+      self.test_types << label if test_directory
     end
 
     def initialize(*pairs)

railties/test/code_statistics_test.rb

@@ -17,6 +17,7 @@ def teardown
   test "register directories" do
     Rails::CodeStatistics.register_directory("My Directory", "path/to/dir")
     assert Rails::CodeStatistics.directories.include?(["My Directory", "path/to/dir"])
+    assert_not Rails::CodeStatistics.test_types.include?("My Directory")
   ensure
     Rails::CodeStatistics.directories.delete(["My Directory", "path/to/dir"])
   end