1 files changed, 112 insertions, 0 deletions
diff --git a/devtools/client/framework/test/browser_target_get-front.js b/devtools/client/framework/test/browser_target_get-front.js
new file mode 100644
index 0000000000..9dac79d196
--- /dev/null
+++ b/devtools/client/framework/test/browser_target_get-front.js
@@ -0,0 +1,112 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+add_task(async function () {
+  const tab = await addTab("about:blank");
+  const target = await createAndAttachTargetForTab(tab);
+
+  const tab2 = await addTab("about:blank");
+  const target2 = await createAndAttachTargetForTab(tab2);
+
+  info("Test the targetFront attribute for the root");
+  const { client } = target;
+  is(
+    client.mainRoot.targetFront,
+    null,
+    "got null from the targetFront attribute for the root"
+  );
+  is(
+    client.mainRoot.parentFront,
+    null,
+    "got null from the parentFront attribute for the root"
+  );
+
+  info("Test getting a front twice");
+  const getAccessibilityFront = await target.getFront("accessibility");
+  const getAccessibilityFront2 = await target.getFront("accessibility");
+  is(
+    getAccessibilityFront,
+    getAccessibilityFront2,
+    "got the same front when calling getFront twice"
+  );
+  is(
+    getAccessibilityFront.targetFront,
+    target,
+    "got the correct targetFront attribute from the front"
+  );
+  is(
+    getAccessibilityFront2.targetFront,
+    target,
+    "got the correct targetFront attribute from the front"
+  );
+  is(
+    getAccessibilityFront.parentFront,
+    target,
+    "got the correct parentFront attribute from the front"
+  );
+  is(
+    getAccessibilityFront2.parentFront,
+    target,
+    "got the correct parentFront attribute from the front"
+  );
+
+  info("Test getting a front on different targets");
+  const target1Front = await target.getFront("accessibility");
+  const target2Front = await target2.getFront("accessibility");
+  is(
+    target1Front !== target2Front,
+    true,
+    "got different fronts when calling getFront on different targets"
+  );
+  is(
+    target1Front.targetFront !== target2Front.targetFront,
+    true,
+    "got different targetFront from different fronts from different targets"
+  );
+  is(
+    target2Front.targetFront,
+    target2,
+    "got the correct targetFront attribute from the front"
+  );
+
+  info("Test async front retrieval");
+  // use two fronts that are initialized one after the other.
+  const asyncFront1 = target.getFront("accessibility");
+  const asyncFront2 = target.getFront("accessibility");
+
+  info("waiting on async fronts returns a real front");
+  const awaitedAsyncFront1 = await asyncFront1;
+  const awaitedAsyncFront2 = await asyncFront2;
+  is(
+    awaitedAsyncFront1,
+    awaitedAsyncFront2,
+    "got the same front when requesting the front first async then sync"
+  );
+  await target.destroy();
+  await target2.destroy();
+
+  info("destroying a front immediately is possible");
+  await testDestroy();
+});
+
+async function testDestroy() {
+  // initialize a clean target
+  const tab = await addTab("about:blank");
+  const target = await createAndAttachTargetForTab(tab);
+
+  // do not wait for the front to finish loading
+  target.getFront("accessibility");
+
+  try {
+    await target.destroy();
+    ok(
+      true,
+      "calling destroy on an async front instantiated with getFront does not throw"
+    );
+  } catch (e) {
+    ok(
+      false,
+      "calling destroy on an async front instantiated with getFront does not throw"
+    );
+  }
+}