Bug 1746595 - [wdspec] Add wdspec tests for unknown command error r=webdriver-reviewers,whimboo

Depends on D134247

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

testing/web-platform/meta/webdriver/tests/bidi/errors/errors.py.ini

@@ -0,0 +1,3 @@
+[errors.py]
+  disabled:
+    if release_or_beta: https://bugzilla.mozilla.org/show_bug.cgi?id=1712902

testing/web-platform/tests/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}", {})