Part 0: Remove a bug from a meta file, and test that we aren't comparing offers with answers.

Differential Revision: https://phabricator.services.mozilla.com/D24096

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1531122
gecko-commit: ecb3fee216580948044845803338c60e3a283ffe
gecko-integration-branch: central
gecko-reviewers: jib

Author: docfaraday

webrtc/RTCPeerConnection-setLocalDescription-answer.html

@@ -171,4 +171,19 @@
         pc.setLocalDescription(answer)));
   }, 'Calling setLocalDescription(answer) from have-local-offer state should reject with InvalidStateError');
 
+  promise_test(async t => {
+    const pc1 = new RTCPeerConnection();
+    t.add_cleanup(() => pc1.close());
+    const pc2 = new RTCPeerConnection();
+    t.add_cleanup(() => pc2.close());
+
+    const offer = await pc1.createOffer({offerToReceiveAudio: true});
+    await pc2.setRemoteDescription(offer);
+    const answer = await pc2.createAnswer(); // [[LastAnswer]] slot set
+    await pc2.setRemoteDescription({type: "rollback"});
+    await pc2.createOffer({offerToReceiveVideo: true}); // [[LastOffer]] slot set
+    await pc2.setRemoteDescription(offer);
+    await pc2.setLocalDescription(answer); // Should check against [[LastAnswer]], not [[LastOffer]]
+  }, "Setting previously generated answer after a call to createOffer should work");
+
 </script>

webrtc/RTCPeerConnection-setLocalDescription-offer.html

@@ -157,4 +157,18 @@
           }))));
   }, 'Creating and setting offer multiple times should succeed');
 
+  promise_test(async t => {
+    const pc1 = new RTCPeerConnection();
+    t.add_cleanup(() => pc1.close());
+    const pc2 = new RTCPeerConnection();
+    t.add_cleanup(() => pc2.close());
+
+    const offer = await pc1.createOffer({offerToReceiveAudio: true}); // [[LastOffer]] set
+    const offer2 = await pc2.createOffer({offerToReceiveVideo: true});
+    await pc1.setRemoteDescription(offer2);
+    await pc1.createAnswer(); // [[LastAnswer]] set
+    await pc1.setRemoteDescription({type: "rollback"});
+    await pc1.setLocalDescription(offer);
+  }, "Setting previously generated offer after a call to createAnswer should work");
+
 </script>