test_navigator_gpu_not_replaceable.html

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<!doctype html>

<html>

  <head>

    <meta charset="utf-8" />

    <script src="/tests/SimpleTest/SimpleTest.js"></script>

    <link rel="stylesheet" href="/tests/SimpleTest/test.css" />

  </head>

  <body>

    <script>

ok(

        SpecialPowers.getBoolPref("dom.webgpu.enabled"),

        "Pref should be enabled."

);

      const originalNavigatorGpu = navigator.gpu;

      const BAD_GPU_VAL = "ohcrapthisisbad";

ok(

        navigator.gpu !== BAD_GPU_VAL,

        "`navigator.gpu` should never equal `BAD_GPU_VAL` (before replacement attempt)"

);

      navigator.gpu = BAD_GPU_VAL;

ok(

        navigator.gpu !== BAD_GPU_VAL,

        "`navigator.gpu` should never equal `BAD_GPU_VAL` (after replacement attempt)"

);

ok(

        navigator.gpu === originalNavigatorGpu,

        "`navigator.gpu` should equal originally observed value after attempted replacement"

);

    </script>

  </body>

</html>