1 files changed, 47 insertions, 0 deletions
diff --git a/toolkit/components/uniffi-bindgen-gecko-js/fixtures/tests/xpcshell/test_callbacks.js b/toolkit/components/uniffi-bindgen-gecko-js/fixtures/tests/xpcshell/test_callbacks.js
new file mode 100644
index 0000000000..ff5ef464ef
--- /dev/null
+++ b/toolkit/components/uniffi-bindgen-gecko-js/fixtures/tests/xpcshell/test_callbacks.js
@@ -0,0 +1,47 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { logEvenNumbers, logEvenNumbersMainThread } = ChromeUtils.import(
+  "resource://gre/modules/RustFixtureCallbacks.jsm"
+);
+
+class Logger {
+  constructor() {
+    this.messages = [];
+    this.finishedPromise = new Promise((resolve, reject) => {
+      this.finishedResolve = resolve;
+      this.finishedReject = reject;
+    });
+  }
+
+  log(message) {
+    this.messages.push(message);
+  }
+
+  finished() {
+    this.finishedResolve(true);
+  }
+
+  async waitForFinish() {
+    // Set a timeout to avoid hanging the tests if the Rust code fails to call finished().
+    do_timeout(2000, () =>
+      this.finishedReject("Timeout waiting for finished()")
+    );
+    return this.finishedPromise;
+  }
+}
+
+add_task(async function testLogEvenNumbers() {
+  async function runTest(logEvenNumbersFunc) {
+    const logger = new Logger();
+    logEvenNumbersFunc(logger, [1, 1, 2, 3, 5, 8, 13]);
+    await logger.waitForFinish();
+    Assert.deepEqual(logger.messages, [
+      "Saw even number: 2",
+      "Saw even number: 8",
+    ]);
+  }
+
+  await runTest(logEvenNumbers);
+  await runTest(logEvenNumbersMainThread);
+});