re-adding test that went missing

Author: NeilSmithDLS

tests/unit_tests/cli/test_cli.py

@@ -1138,6 +1138,26 @@ def test_login_with_unauthenticated_server(
     assert result.exit_code == 0
 
 
+@responses.activate
+def test_invalid_json(
+    runner: CliRunner,
+    config_with_auth: str,
+    mock_authn_server: responses.RequestsMock,
+):
+    response = responses.add(
+        responses.GET,
+        "http://localhost:8000/config/oidc",
+        body="blah blah",
+        status=404,
+    )
+
+    result = runner.invoke(main, ["-c", config_with_auth, "login"])
+
+    assert response.call_count == 1
+    assert "Response does not contain a valid JSON object\n" == result.output
+    assert result.exit_code == 0
+
+
 def test_logout_success(
     runner: CliRunner,
     config_with_auth: str,