test_sessionstorage_across_coop.html

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<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1790666

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<head>

  <title>Test for Bug 1790666</title>

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

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

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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1790666">Mozilla Bug 1790666</a>

<p id="display"></p>

<div id="content" style="display: none">

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<pre id="test">

  <script type="application/javascript">

    async function singleTest(testValue, description) {

      info(`Starting test: ${description}`);

      let bc = new BroadcastChannel("testChannel");

      let promise = new Promise(resolve => {

        bc.addEventListener("message", event => {

          info(`received message from testChannel: ${event.data}`);

          resolve(event.data);

        }, { once: true });

});

      info("Opening pop-up");

      let popup = window.open("", "_blank");

      popup.sessionStorage.setItem("testItem", testValue);

      info("Navigating pop-up to COOP page");

      popup.location = new URL("file_sessionstorage_across_coop.html", window.location);

      let newValue = await promise;

      is(newValue, testValue, "Value matches expected value");

    add_task(async function() {

      // Cross-Origin-Opener-Policy is only supported in secure contexts, so

      // make the test a secure context.

      await SpecialPowers.pushPrefEnv({

        "set": [["dom.securecontext.allowlist", "mochi.test"]],

});

      await singleTest("short test value", "short test value");

      let longValue = "A".repeat(SpecialPowers.getIntPref("browser.sessionstore.dom_storage_limit") * 2);

      await singleTest(longValue, "long test value");

});

  </script>

</pre>

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