test_gpu_process_kill_for_testing.html

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<html>

  <head>

    <meta charset="utf-8">

    <title>Test that killing the GPU process for tests does not disable it</title>

    <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>

    <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css">

  </head>

  <body>

    <script>

      const { TestUtils } = ChromeUtils.importESModule(

        "resource://testing-common/TestUtils.sys.mjs"

);

      add_task(async function test_kill_gpu_process_repeatedly() {

        const gfxInfo = Cc["@mozilla.org/gfx/info;1"].getService(Ci.nsIGfxInfo);

        if (!gfxInfo.usingGPUProcess) {

          ok(true, "Not using GPU process");

          return;

        const layerManagerType = window.windowUtils.layerManagerType;

        const maxRestarts = Services.prefs.getIntPref(

          "layers.gpu-process.max_restarts"

);

        const attempts = maxRestarts + 2;

        for (let i = 0; i < attempts; ++i) {

          const reinitialized = TestUtils.topicObserved(

            "compositor-reinitialized"

);

          gfxInfo.killGPUProcessForTests();

          await reinitialized;

ok(

            gfxInfo.usingGPUProcess,

            `Should still use GPU process after kill ${i + 1} of ${attempts}`

);

is(

            window.windowUtils.layerManagerType,

            layerManagerType,

            `Should not fall back after kill ${i + 1} of ${attempts}`

);

});

    </script>

  </body>

</html>