FileFieldPathTestCase::testUploadPath in core/modules/file/tests/file.test

Tests the normal formatter display on node display.

FileFieldValidateTestCase::testFileExtension in core/modules/file/tests/file.test

Tests file extension checking.

FileFieldValidateTestCase::testFileMaxSize in core/modules/file/tests/file.test

Tests the max file size validator.

FileFieldWidgetTestCase::testWidgetValidation in core/modules/file/tests/file.test

Tests validation with the Upload button.