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+<!doctype html>
+<meta charset=utf-8>
+<title>RTCPeerConnection.prototype.setRemoteDescription - answer</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="RTCPeerConnection-helper.js"></script>
+<script>
+  'use strict';
+
+  // Test is based on the following editor draft:
+  // https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html
+
+  // The following helper functions are called from RTCPeerConnection-helper.js:
+  //   generateAnswer()
+  //   assert_session_desc_similar()
+
+  /*
+    4.3.2.  Interface Definition
+      [Constructor(optional RTCConfiguration configuration)]
+      interface RTCPeerConnection : EventTarget {
+        Promise<void>                      setRemoteDescription(
+            RTCSessionDescriptionInit description);
+
+        readonly attribute RTCSessionDescription? remoteDescription;
+        readonly attribute RTCSessionDescription? currentRemoteDescription;
+        readonly attribute RTCSessionDescription? pendingRemoteDescription;
+        ...
+      };
+
+    4.6.2.  RTCSessionDescription Class
+      dictionary RTCSessionDescriptionInit {
+        required RTCSdpType type;
+                 DOMString  sdp = "";
+      };
+
+    4.6.1.  RTCSdpType
+      enum RTCSdpType {
+        "offer",
+        "pranswer",
+        "answer",
+        "rollback"
+      };
+   */
+
+  /*
+    4.3.1.6.  Set the RTCSessionSessionDescription
+      2.2.3.  Otherwise, if description is set as a remote description, then run one of
+              the following steps:
+        - If description is of type "answer", then this completes an offer answer
+          negotiation.
+
+          Set connection's currentRemoteDescription to description and
+          currentLocalDescription to the value of pendingLocalDescription.
+
+          Set both pendingRemoteDescription and pendingLocalDescription to null.
+
+          Finally setconnection's signaling state to stable.
+   */
+  promise_test(t => {
+    const pc = new RTCPeerConnection();
+    t.add_cleanup(() => pc.close());
+
+    const states = [];
+    pc.addEventListener('signalingstatechange', () => states.push(pc.signalingState));
+
+    return generateVideoReceiveOnlyOffer(pc)
+    .then(offer =>
+      pc.setLocalDescription(offer)
+      .then(() => generateAnswer(offer))
+      .then(answer =>
+        pc.setRemoteDescription(answer)
+        .then(() => {
+          assert_equals(pc.signalingState, 'stable');
+
+          assert_session_desc_similar(pc.localDescription, offer);
+          assert_session_desc_similar(pc.remoteDescription, answer);
+
+          assert_session_desc_similar(pc.currentLocalDescription, offer);
+          assert_session_desc_similar(pc.currentRemoteDescription, answer);
+
+          assert_equals(pc.pendingLocalDescription, null);
+          assert_equals(pc.pendingRemoteDescription, null);
+
+          assert_array_equals(states, ['have-local-offer', 'stable']);
+        })));
+  }, 'setRemoteDescription() with valid state and answer should succeed');
+
+  /*
+    4.3.1.6.  Set the RTCSessionSessionDescription
+      2.1.3.  If the description's type is invalid for the current signaling state of
+              connection, then reject p with a newly created InvalidStateError and abort
+              these steps.
+
+    [JSEP]
+      5.6.  If the type is "answer", the PeerConnection state MUST be either
+            "have-local-offer" or "have-remote-pranswer".
+   */
+  promise_test(t => {
+    const pc = new RTCPeerConnection();
+
+    t.add_cleanup(() => pc.close());
+
+    return pc.createOffer()
+    .then(offer =>
+      promise_rejects_dom(t, 'InvalidStateError',
+        pc.setRemoteDescription({ type: 'answer', sdp: offer.sdp })));
+  }, 'Calling setRemoteDescription(answer) from stable state should reject with InvalidStateError');
+
+  promise_test(t => {
+    const pc = new RTCPeerConnection();
+
+    t.add_cleanup(() => pc.close());
+
+    return pc.createOffer()
+    .then(offer =>
+      pc.setRemoteDescription(offer)
+      .then(() => generateAnswer(offer)))
+    .then(answer =>
+      promise_rejects_dom(t, 'InvalidStateError',
+        pc.setRemoteDescription(answer)));
+  }, 'Calling setRemoteDescription(answer) from have-remote-offer state should reject with InvalidStateError');
+
+</script>