Test: add missing coverage for streaming error

Author: Alexj9837

tests/unit_tests/cli/test_cli.py

@@ -721,13 +721,18 @@ def test_env_reload_server_side_error(runner: CliRunner):
             ValueError("Error parsing parameters"),
             "Error: task could not run: Error parsing parameters\n",
         ),
+        (
+            BlueskyStreamingError("streaming failed"),
+            "Error: streaming error: streaming failed\n",
+        ),
     ],
     ids=[
         "unknown_plan",
         "unauthorised_access",
         "invalid_parameters",
         "remote_control",
         "value_error",
+        "streaming_error",
     ],
 )
 def test_error_handling(exception, error_message, runner: CliRunner):