[wdspec] Add wdspec tests for unknown command error

Depends on D134247

Differential Revision: https://phabricator.services.mozilla.com/D134248

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1746595
gecko-commit: 37149f29af6d58d035bdc9d35bcf0c805ead5352
gecko-reviewers: webdriver-reviewers, whimboo

Author: juliandescottes

webdriver/tests/bidi/errors/errors.py

@@ -0,0 +1,16 @@
+import pytest
+
+from webdriver.bidi.error import UnknownCommandException
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("module_name, command_name", [
+    ("invalidmodule", "somecommand"),
+    ("session", "wrongcommand"),
+], ids=[
+    'invalid module',
+    'invalid command name',
+])
+async def test_unknown_command(bidi_session, send_blocking_command, module_name, command_name):
+    with pytest.raises(UnknownCommandException):
+        await send_blocking_command(f"{module_name}.{command_name}", {})