File: 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>