• erb
• yaml
• zlib
• set
• active_support/dependencies
• active_support/core_ext/digest/uuid
• active_record/test_fixtures
• active_record/fixture_set/file
• active_record/fixture_set/render_context
• active_record/fixture_set/table_rows

• 模块 ActiveRecord
• 模块 Digest
• 类 ActiveRecord::FixtureSet