1 files changed, 17 insertions, 0 deletions
diff --git a/testing/mochitest/tests/Harness_sanity/SpecialPowersLoadChromeScript.js b/testing/mochitest/tests/Harness_sanity/SpecialPowersLoadChromeScript.js
new file mode 100644
index 0000000000..e46375159f
--- /dev/null
+++ b/testing/mochitest/tests/Harness_sanity/SpecialPowersLoadChromeScript.js
@@ -0,0 +1,17 @@
+/* eslint-env mozilla/chrome-script */
+
+// 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.";
+});