1 files changed, 33 insertions, 0 deletions
diff --git a/devtools/client/framework/test/browser_target_listeners.js b/devtools/client/framework/test/browser_target_listeners.js
new file mode 100644
index 0000000000..942ac3bed1
--- /dev/null
+++ b/devtools/client/framework/test/browser_target_listeners.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function () {
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  const target = await createAndAttachTargetForTab(gBrowser.selectedTab);
+
+  info("Test applying watchFronts to a front that will be created");
+  const promise = new Promise(resolve => {
+    target.watchFronts("accessibility", resolve);
+  });
+  const getFrontFront = await target.getFront("accessibility");
+  const watchFrontsFront = await promise;
+  is(
+    getFrontFront,
+    watchFrontsFront,
+    "got the front instantiated in the future and it's the same"
+  );
+
+  info("Test applying watchFronts to an existing front");
+  await new Promise(resolve => {
+    target.watchFronts("accessibility", front => {
+      is(
+        front,
+        getFrontFront,
+        "got the already instantiated front and it's the same"
+      );
+      resolve();
+    });
+  });
+});