add another test for non_json_body

Author: Alexj9837

tests/unit_tests/client/test_rest.py

@@ -18,6 +18,7 @@
     UnauthorisedAccessError,
     UnknownPlanError,
     _create_task_exceptions,
+    _exception,
 )
 from blueapi.config import OIDCConfig
 from blueapi.service.authentication import SessionCacheManager, SessionManager
@@ -120,6 +121,21 @@ def test_create_task_exceptions(
             assert err.args[1] == content
 
 
+def test_exception_non_json_body_falls_back_to_text():
+    import json
+
+    response = Mock(spec=requests.Response)
+    response.status_code = 500
+    response.text = "Internal Server Error"
+    response.json.side_effect = json.JSONDecodeError("Expecting value", "", 0)
+    response.request = Mock()
+    response.request.url = "http://localhost:8000/test"
+    response.content = b"Internal Server Error"
+    err = _exception(response)
+    assert isinstance(err, BlueskyRemoteControlError)
+    assert err.args[1] == "Internal Server Error"
+
+
 def test_auth_request_functionality(
     rest_with_auth: BlueapiRestClient,
     mock_authn_server: responses.RequestsMock,