test_onGarbageCollection.html

Enable keyboard shortcuts

<!doctype html>

<html>

  <head>

    <title>Bug 1150253 - Sanity test for the SpiderMonkey Debugger API's onGarbageCollection hook</title>

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

    </script>

  </head>

  <body xmlns="http://www.w3.org/1999/xhtml">

    <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1150253"

       target="_blank">Mozilla Bug 1150253</a>

    <script type="application/javascript">

    SimpleTest.waitForExplicitFinish();

    const { gc } = Cu.getJSTestingFunctions();

    // Instantiate `Debugger` in a sandbox as Debugger requires to be created

    // in a compartment different than the debuggee.

    let sandbox = Cu.Sandbox(

      Components.Constructor("@mozilla.org/systemprincipal;1", "nsIPrincipal")(),

        freshCompartment: true,

        wantGlobalProperties: ["ChromeUtils"],

);

    Cu.evalInSandbox(`

const { addDebuggerToGlobal } = ChromeUtils.importESModule(

  'resource://gre/modules/jsdebugger.sys.mjs'

);

addDebuggerToGlobal(globalThis);

`, sandbox

);

    const dbg = new sandbox.Debugger(this);

    dbg.memory.onGarbageCollection = function (data) {

      // Don't keep calling this hook after we finish.

      dbg.memory.onGarbageCollection = undefined;

      dbg.removeAllDebuggees();

      ok(data, "The onGarbageCollection hook was fired.");

      SimpleTest.finish();

};

    gc();

    </script>

  </body>

</html>