1 files changed, 69 insertions, 0 deletions
diff --git a/testing/mochitest/tests/Harness_sanity/test_SpecialPowersSpawn.html b/testing/mochitest/tests/Harness_sanity/test_SpecialPowersSpawn.html
new file mode 100644
index 0000000000..fe93c1fe83
--- /dev/null
+++ b/testing/mochitest/tests/Harness_sanity/test_SpecialPowersSpawn.html
@@ -0,0 +1,69 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for SpecialPowers.spawn</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+
+<iframe id="iframe"></iframe>
+
+<span id="hello">World.</span>
+
+<script>
+/* globals SpecialPowers, content */
+
+  add_task(async function() {
+    let frame = document.getElementById("iframe");
+    frame.src = "https://example.com/tests/testing/mochitest/tests/Harness_sanity/file_spawn.html";
+
+    await new Promise(resolve => {
+      frame.addEventListener("load", resolve, {once: true});
+    });
+
+    let result = await SpecialPowers.spawn(frame, ["#span"], selector => {
+      let elem = content.document.querySelector(selector);
+      return elem.textContent;
+    });
+
+    is(result, "Hello there.", "Got correct element text from frame");
+
+    /* eslint-disable no-shadow */
+    result = await SpecialPowers.spawn(frame, ["#hello"], selector => {
+      return SpecialPowers.spawn(content.parent, [selector], selector => {
+        let elem = content.document.querySelector(selector);
+        return elem.textContent;
+      });
+    });
+
+    is(result, "World.", "Got correct element text from frame's window.parent");
+
+    result = await SpecialPowers.spawn(frame.contentWindow, ["#span"], selector => {
+      let elem = content.document.querySelector(selector);
+      return elem.textContent;
+    });
+
+    is(result, "Hello there.", "Got correct element text from window proxy");
+
+    result = await SpecialPowers.spawn(SpecialPowers.getPrivilegedProps(frame, "browsingContext"),
+                                       ["#span"], selector => {
+      let elem = content.document.querySelector(selector);
+      return elem.textContent;
+    });
+
+    is(result, "Hello there.", "Got correct element text from browsing context");
+
+    let line = 58; // Keep this in sync with the line number where the callback function starts.
+    let callback = () => {
+      let e = new Error("Hello.");
+      return { filename: e.fileName, lineNumber: e.lineNumber };
+    };
+
+    let loc = await SpecialPowers.spawn(frame, [], callback);
+    is(loc.filename, location.href, "Error should have correct script filename");
+    is(loc.lineNumber, line + 2, "Error should have correct script line number");
+  });
+</script>
+</body>
+</html>