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diff --git a/testing/mochitest/tests/Harness_sanity/test_SpecialPowersLoadChromeScript_function.html b/testing/mochitest/tests/Harness_sanity/test_SpecialPowersLoadChromeScript_function.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test for SpecialPowers.loadChromeScript</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+
+<pre id="test">
+<script class="testbody" type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+
+var script = SpecialPowers.loadChromeScript(function loadChromeScriptTest() {
+ /* eslint-env mozilla/chrome-script */
+ // Copied from SpecialPowersLoadChromeScript.js
+
+ // Just receive 'foo' message and forward it back
+ // as 'bar' message
+ addMessageListener("foo", function (message) {
+ sendAsyncMessage("bar", message);
+ });
+
+ addMessageListener("valid-assert", function (message) {
+ assert.ok(true, "valid assertion");
+ assert.equal(1, 1, "another valid assertion");
+ sendAsyncMessage("valid-assert-done");
+ });
+
+ addMessageListener("sync-message", () => {
+ return "Received a synchronous message.";
+ });
+});
+
+var MESSAGE = { bar: true };
+script.addMessageListener("bar", function (message) {
+ is(JSON.stringify(message), JSON.stringify(MESSAGE),
+ "received back message from the chrome script");
+
+ checkAssert();
+});
+
+function checkAssert() {
+ script.sendAsyncMessage("valid-assert");
+ script.addMessageListener("valid-assert-done", endOfTest);
+}
+
+async function endOfTest() {
+ is(await script.sendQuery("sync-message"), "Received a synchronous message.",
+ "Check sync return value");
+
+ script.destroy();
+ SimpleTest.finish();
+}
+
+script.sendAsyncMessage("foo", MESSAGE);
+
+</script>
+</pre>
+</body>
+</html>