<!DOCTYPE html>
<body>
  <script src=/resources/testharness.js></script>
  <script src=/resources/testharnessreport.js></script>
  <script src="resources/webxr_util.js"></script>
  <script src="resources/webxr_test_constants.js"></script>
  <canvas></canvas>

  <script>
    xr_promise_test(
      "Test prevention of multiple simultaneous immersive sessions",
      (t) => {
      return navigator.xr.test.simulateDeviceConnection(TRACKED_IMMERSIVE_DEVICE)
        .then( (controller) => new Promise((resolve) => {
          navigator.xr.test.simulateUserActivation( () => {
            resolve(navigator.xr.requestSession('immersive-vr')
              .then( (session) => new Promise((resolve) => {
                navigator.xr.test.simulateUserActivation( () => {
                  // Requesting a second immersive session when another immersive
                  // session is active should fail. Immersive sessions
                  // should take up the users entire view, and therefore it should
                  // be impossible for a user to be engaged with more than one.
                  resolve(promise_rejects_dom(
                    t,
                    "InvalidStateError",
                    navigator.xr.requestSession('immersive-vr')
                  ).then( () => {
                      // End the immersive session and try again. Now the immersive
                      // session creation should succeed.
                      return session.end().then( () => new Promise((resolve) => {
                        navigator.xr.test.simulateUserActivation( () => {
                          resolve(navigator.xr.requestSession('immersive-vr'));
                        });
                      }));
                    }));
                });
            })));
          });
        }));
    });

  </script>
</body>