The follow two tests:

http/tests/media/fairplay/legacy-fairplay-mse-v2.html 
http/tests/media/fairplay/legacy-fairplay-mse-v3.html

are broken for macOS. There are a constant string of timeouts, crashes and failures 



HISTORY:

https://results.webkit.org/?suite=layout-tests&suite=layout-tests&test=http%2Ftests%2Fmedia%2Ffairplay%2Flegacy-fairplay-mse-v2.html&test=http%2Ftests%2Fmedia%2Ffairplay%2Flegacy-fairplay-mse-v3.html

TEXT DIFF for MSE-V3:

@@ -14,6 +14,7 @@
 Appending Encrypted Video Payload
 FETCH: content/elementary-stream-video-payload.m4v OK
 EVENT(updateend)
-EVENT(canplay)
+EVENT(webkitkeyerror)
+FAIL: update() failed
 END OF TEST
 

TIMEOUT TEXT for MSE-V2:
@@ -1,19 +1,4 @@
+FAIL: Timed out waiting for notifyDone to be called
 
 Created mediaSource
-EVENT(sourceopen)
--
-Appending Encrypted Video Header
-FETCH: content/elementary-stream-video-header-keyid-1.m4v OK
-EVENT(webkitneedkey)
-EVENT(webkitkeymessage)
-EXPECTED (uInt8ArrayToString(event.message) == 'certificate') OK
-FETCH: resources/cert.der OK
-EVENT(webkitkeymessage)
-PROMISE: licenseResponse resolved
--
-Appending Encrypted Video Payload
-FETCH: content/elementary-stream-video-payload.m4v OK
-EVENT(updateend)
-EVENT(canplay)
-END OF TEST