1 files changed, 23 insertions, 0 deletions
diff --git a/remote/cdp/test/browser/browser_session.js b/remote/cdp/test/browser/browser_session.js
new file mode 100644
index 0000000000..2afff10330
--- /dev/null
+++ b/remote/cdp/test/browser/browser_session.js
@@ -0,0 +1,23 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function ({ CDP }) {
+  const { webSocketDebuggerUrl } = await CDP.Version();
+  const client = await CDP({ target: webSocketDebuggerUrl });
+
+  await Assert.rejects(
+    client.send("Hoobaflooba"),
+    /Invalid method format/,
+    `Fails with invalid method format`
+  );
+
+  await Assert.rejects(
+    client.send("Hooba.flooba"),
+    /UnknownMethodError/,
+    `Fails with UnknownMethodError`
+  );
+
+  await client.close();
+});