• active_support/core_ext/hash/reverse_merge
• active_support/core_ext/kernel/reporting
• active_support/testing/stream
• rails/generators

• 模块 Rails
• 模块 Rails::Generators
• 模块 Rails::Generators::Testing
• 模块 Rails::Generators::Testing::Behavior
• 模块 Rails::Generators::Testing::Behavior::ClassMethods