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-rw-r--r--js/xpconnect/tests/unit/test_messageChannel.js29
1 files changed, 29 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_messageChannel.js b/js/xpconnect/tests/unit/test_messageChannel.js
new file mode 100644
index 0000000000..685aa10e43
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_messageChannel.js
@@ -0,0 +1,29 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function() {
+ let sb = new Cu.Sandbox('http://www.example.com',
+ { wantGlobalProperties: ["MessageChannel"] });
+ sb.ok = ok;
+ Cu.evalInSandbox('ok((new MessageChannel()) instanceof MessageChannel);',
+ sb);
+ Cu.evalInSandbox('ok((new MessageChannel()).port1 instanceof MessagePort);',
+ sb);
+
+ Cu.importGlobalProperties(["MessageChannel"]);
+
+ let mc = new MessageChannel();
+ Assert.ok(mc instanceof MessageChannel);
+ Assert.ok(mc.port1 instanceof MessagePort);
+ Assert.ok(mc.port2 instanceof MessagePort);
+
+ mc.port1.postMessage(42);
+
+ let result = await new Promise(resolve => {
+ mc.port2.onmessage = e => {
+ resolve(e.data);
+ }
+ });
+
+ Assert.equal(result, 42);
+});