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<!--
Bug 1068171 - Test controlling the memory actor's allocation sampling probability.
-->
<head>
  <meta charset="utf-8">
  <title>Memory monitoring actor test</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">
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<pre id="test">
<script src="memory-helpers.js" type="application/javascript"></script>
<script>
"use strict";

window.onload = function() {
  SimpleTest.waitForExplicitFinish();

  (async function() {
    const { memory, target } = await startServerAndGetSelectedTabMemory();
    await memory.attach();

    const allocs = [];
    function allocator() {
      for (let i = 0; i < 100; i++) {
        allocs.push({});
      }
    }

    const testProbability = async function(p, expected) {
      info("probability = " + p);
      await memory.startRecordingAllocations({
        probability: p,
      });
      allocator();
      const response = await memory.getAllocations();
      await memory.stopRecordingAllocations();
      return response.allocations.length;
    };

    is((await testProbability(0.0)), 0,
       "With probability = 0.0, we shouldn't get any allocations.");

    ok((await testProbability(1.0)) >= 100,
       "With probability = 1.0, we should get all 100 allocations (plus "
       + "whatever allocations the actor and SpiderMonkey make).");

    // We don't test any other probabilities because the test would be
    // non-deterministic. We don't have a way to control the PRNG like we do in
    // jit-tests
    // (js/src/jit-test/tests/debug/Memory-allocationsSamplingProbability-*.js).

    await memory.detach();
    destroyServerAndFinish(target);
  })();
};
</script>
</pre>
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