1 files changed, 82 insertions, 0 deletions
diff --git a/remote/shared/listeners/test/browser/browser_ConsoleListener_cached_messages.js b/remote/shared/listeners/test/browser/browser_ConsoleListener_cached_messages.js
new file mode 100644
index 0000000000..1020aee661
--- /dev/null
+++ b/remote/shared/listeners/test/browser/browser_ConsoleListener_cached_messages.js
@@ -0,0 +1,82 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const TEST_PAGE =
+  "https://example.com/document-builder.sjs?html=<meta charset=utf8></meta>";
+
+add_task(async function test_cached_javascript_errors() {
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, TEST_PAGE);
+  await BrowserTestUtils.browserLoaded(gBrowser.selectedBrowser);
+
+  await createScriptNode(`(() => {throw "error1"})()`);
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+    const innerWindowId = content.windowGlobalChild.innerWindowId;
+    const { ConsoleListener } = ChromeUtils.importESModule(
+      "chrome://remote/content/shared/listeners/ConsoleListener.sys.mjs"
+    );
+
+    const listener = new ConsoleListener(innerWindowId);
+
+    const errors = [];
+    // Do not push the whole error object in the array. It would create a strong
+    // reference preventing from reproducing GC-related bugs.
+    const onError = (evtName, error) => errors.push(error.message);
+    listener.on("error", onError);
+
+    const waitForMessage = listener.once("error");
+    listener.startListening();
+    const error = await waitForMessage;
+    is(error.message, "uncaught exception: error1");
+    is(errors.length, 1);
+
+    listener.stopListening();
+    content.backup = { listener, errors, onError };
+  });
+
+  // Force a GC to check that old cached messages which have been garbage
+  // collected are not re-displayed.
+  await doGC();
+  await createScriptNode(`(() => {throw "error2"})()`);
+
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+    const { listener, errors, onError } = content.backup;
+
+    const waitForMessage = listener.once("error");
+    listener.startListening();
+    const { message } = await waitForMessage;
+    is(message, "uncaught exception: error2");
+    is(errors.length, 2);
+
+    listener.off("error", onError);
+    listener.destroy();
+  });
+
+  info("Reload the current tab and check only new messages are emitted");
+  await BrowserTestUtils.reloadTab(gBrowser.selectedTab);
+
+  await createScriptNode(`(() => {throw "error3"})()`);
+  await SpecialPowers.spawn(gBrowser.selectedBrowser, [], async () => {
+    const innerWindowId = content.windowGlobalChild.innerWindowId;
+    const { ConsoleListener } = ChromeUtils.importESModule(
+      "chrome://remote/content/shared/listeners/ConsoleListener.sys.mjs"
+    );
+
+    const listener = new ConsoleListener(innerWindowId);
+
+    const errors = [];
+    const onError = (evtName, error) => errors.push(error.message);
+    listener.on("error", onError);
+
+    const waitForMessage = listener.once("error");
+    listener.startListening();
+    const error = await waitForMessage;
+    is(error.message, "uncaught exception: error3");
+    is(errors.length, 1);
+
+    listener.off("error", onError);
+    listener.destroy();
+  });
+
+  gBrowser.removeTab(gBrowser.selectedTab);
+});