1 files changed, 62 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser/browser_webconsole_telemetry_js_errors.js b/devtools/client/webconsole/test/browser/browser_webconsole_telemetry_js_errors.js
new file mode 100644
index 0000000000..4f4fbe7939
--- /dev/null
+++ b/devtools/client/webconsole/test/browser/browser_webconsole_telemetry_js_errors.js
@@ -0,0 +1,62 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests the DEVTOOLS_JAVASCRIPT_ERROR_DISPLAYED telemetry event.
+
+"use strict";
+
+const TEST_URI = `data:text/html,<!DOCTYPE html><meta charset=utf8><script>document()</script>`;
+
+add_task(async function () {
+  startTelemetry();
+
+  const hud = await openNewTabAndConsole(TEST_URI);
+
+  info(
+    "Check that the error message is logged in telemetry with the expected key"
+  );
+  await waitFor(() => findErrorMessage(hud, "is not a function"));
+  checkErrorDisplayedTelemetry("JSMSG_NOT_FUNCTION", 1);
+
+  await reloadBrowser();
+
+  info("Reloading the page (and having the same error) increments the sum");
+  await waitFor(() => findErrorMessage(hud, "is not a function"));
+  checkErrorDisplayedTelemetry("JSMSG_NOT_FUNCTION", 2);
+
+  info(
+    "Evaluating an expression resulting in the same error increments the sum"
+  );
+  await executeAndWaitForErrorMessage(
+    hud,
+    "window()",
+    "window is not a function"
+  );
+  checkErrorDisplayedTelemetry("JSMSG_NOT_FUNCTION", 3);
+
+  info(
+    "Evaluating an expression resulting in another error is logged in telemetry"
+  );
+  await executeAndWaitForErrorMessage(
+    hud,
+    `"a".repeat(-1)`,
+    "repeat count must be non-negative"
+  );
+  checkErrorDisplayedTelemetry("JSMSG_NEGATIVE_REPETITION_COUNT", 1);
+
+  await executeAndWaitForErrorMessage(
+    hud,
+    `"b".repeat(-1)`,
+    "repeat count must be non-negative"
+  );
+  checkErrorDisplayedTelemetry("JSMSG_NEGATIVE_REPETITION_COUNT", 2);
+});
+
+function checkErrorDisplayedTelemetry(key, count) {
+  checkTelemetry(
+    "DEVTOOLS_JAVASCRIPT_ERROR_DISPLAYED",
+    key,
+    { 0: 0, 1: count, 2: 0 },
+    "array"
+  );
+}