tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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test_loader.js (2561B)

      1 /* Any copyright is dedicated to the Public Domain.
      2   http://creativecommons.org/publicdomain/zero/1.0/ */
      3 
      4 "use strict";
      5 
      6 const {
      7  useDistinctSystemPrincipalLoader,
      8  releaseDistinctSystemPrincipalLoader,
      9 } = ChromeUtils.importESModule(
     10  "resource://devtools/shared/loader/DistinctSystemPrincipalLoader.sys.mjs",
     11  { global: "shared" }
     12 );
     13 
     14 function run_test() {
     15  const requester = {},
     16    requester2 = {};
     17 
     18  const loader = useDistinctSystemPrincipalLoader(requester);
     19 
     20  // The DevTools dedicated global forces invisibleToDebugger on its realm at
     21  // https://searchfox.org/mozilla-central/rev/12a18f7e112a4dcf88d8441d439b84144bfbe9a3/js/xpconnect/loader/mozJSModuleLoader.cpp#591-593
     22  // but this is not observable directly.
     23  const DevToolsSpecialGlobal = Cu.getGlobalForObject(
     24    ChromeUtils.importESModule(
     25      "resource://devtools/shared/DevToolsInfaillibleUtils.sys.mjs",
     26      { global: "devtools" }
     27    )
     28  );
     29 
     30  const regularLoader = new DevToolsLoader();
     31  Assert.notStrictEqual(
     32    DevToolsSpecialGlobal,
     33    regularLoader.loader.sharedGlobal,
     34    "The regular loader is not using the special DevTools global"
     35  );
     36 
     37  info("Assert the key difference with the other regular loaders:");
     38  Assert.strictEqual(
     39    DevToolsSpecialGlobal,
     40    loader.loader.sharedGlobal,
     41    "The system principal loader is using the special DevTools global"
     42  );
     43 
     44  ok(loader.loader, "Loader is not destroyed before calling release");
     45 
     46  info("Now assert the precise behavior of release");
     47  releaseDistinctSystemPrincipalLoader({});
     48  ok(
     49    loader.loader,
     50    "Loader is still not destroyed after calling release with another requester"
     51  );
     52 
     53  releaseDistinctSystemPrincipalLoader(requester);
     54  ok(
     55    !loader.loader,
     56    "Loader is destroyed after calling release with the right requester"
     57  );
     58 
     59  info("Now test the behavior with two concurrent usages");
     60  const loader2 = useDistinctSystemPrincipalLoader(requester);
     61  Assert.notEqual(loader, loader2, "We get a new loader instance");
     62  Assert.strictEqual(
     63    DevToolsSpecialGlobal,
     64    loader2.loader.sharedGlobal,
     65    "The new system principal loader is also using the special DevTools global"
     66  );
     67 
     68  const loader3 = useDistinctSystemPrincipalLoader(requester2);
     69  Assert.equal(loader2, loader3, "The two loader last loaders are shared");
     70 
     71  releaseDistinctSystemPrincipalLoader(requester);
     72  ok(loader2.loader, "Loader isn't destroy on the first call to destroy");
     73 
     74  releaseDistinctSystemPrincipalLoader(requester2);
     75  ok(!loader2.loader, "Loader is destroyed on the second call to destroy");
     76 }