1 files changed, 62 insertions, 0 deletions
diff --git a/testing/mochitest/tests/Harness_sanity/test_SpecialPowersLoadChromeScript_function.html b/testing/mochitest/tests/Harness_sanity/test_SpecialPowersLoadChromeScript_function.html
new file mode 100644
index 0000000000..af31d7b25a
--- /dev/null
+++ b/testing/mochitest/tests/Harness_sanity/test_SpecialPowersLoadChromeScript_function.html
@@ -0,0 +1,62 @@
+<!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>