Notification test passes on Safari, on the basis that it's not supported.

tests/html/html.status

 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 event_test: Skip  # Issue 1996
 interactive_test: Skip # Must be run manually.
 dromaeo_smoke_test: Skip # Issue 14521, 8257
 cross_frame_test: Skip # Test reloads itself. Issue 18558
 
 [ $compiler == none && ($runtime == drt || $runtime == dartium || $runtime == ContentShellOnAndroid) ]
@@ skipping 229 matching lines @@
 [ $compiler == dart2js && $runtime == drt && $unchecked ]
 audiocontext_test/functional: Pass, Fail
 
 [ $runtime == safari || $runtime == safarimobilesim ]
 worker_api_test: Skip # Issue 13221
 webgl_1_test: Pass, Fail # Issue 8219
 canvasrenderingcontext2d_test/drawImage_video_element: Fail # Safari does not support drawImage w/ video element
 canvasrenderingcontext2d_test/drawImage_video_element_dataUrl: Fail # Safari does not support drawImage w/ video element
 element_test: Pass, Fail # Issue 21434
 mediasource_test: Pass, Fail # MediaSource only available on Safari 8 desktop, we can't express that.
-notification_test/constructors: Fail # Safari doesn't let us access the Notification fields to verify them
 
 # Safari Feature support statuses-
 # All changes should be accompanied by platform support annotation changes.
 element_types_test/supported_content: Fail
 element_types_test/supported_datalist: Fail
 element_types_test/supported_shadow: Fail
 fileapi_test/supported: Fail
 indexeddb_1_test/supportsDatabaseNames: Fail
 media_stream_test/supported_MediaStreamEvent: Fail
 media_stream_test/supported_MediaStreamTrackEvent: Fail
 media_stream_test/supported_media: Fail
 performance_api_test/supported: Fail
 rtc_test/supported: Fail
 shadow_dom_test/supported: Fail
 speechrecognition_test/supported: Fail
 
 [ $runtime == safarimobilesim ]
 indexeddb_1_test/supported: Fail
 element_types_test/supported_template: Fail
 xhr_test/json: Fail # Safari doesn't support JSON response type
+notification_test/constructors: Pass # Safari mobile will pass this test on the basis that notifications aren't supported at all.
 
 [ $runtime == safari ]
 input_element_test/supported_month: RuntimeError
 input_element_test/supported_time: RuntimeError
 input_element_test/supported_week: RuntimeError
 input_element_test/supported_date: Fail
 input_element_test/supported_datetime-local: Fail
 touchevent_test/supported: Fail
+notification_test/constructors: Fail # Safari doesn't let us access the fields of the Notification to verify them.
 
 [ $runtime == safari ]
 indexeddb_1_test/functional: Skip # Times out. Issue 21433
 indexeddb_2_test: RuntimeError # Issue 21433
 indexeddb_4_test: RuntimeError # Issue 21433
 indexeddb_5_test: RuntimeError # Issue 21433
 wheelevent_test: RuntimeError # Issue 21434
 js_test: RuntimeError # Issue 21434
 
 [ $runtime == opera ]
@@ skipping 110 matching lines @@
 htmlelement_test: StaticWarning
 localstorage_test: StaticWarning
 mutationobserver_test: StaticWarning
 queryall_test: fail
 track_element_constructor_test: StaticWarning
 transferables_test: StaticWarning
 typed_arrays_range_checks_test: StaticWarning
 typing_test: StaticWarning
 webgl_1_test: StaticWarning
 window_nosuchmethod_test: StaticWarning