test(alerts/reports): close backend and frontend test coverage gaps (#38591)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

tests/unit_tests/reports/api_test.py

@@ -0,0 +1,52 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from typing import Any
+from unittest.mock import patch
+
+import prison
+
+from superset.exceptions import SupersetException
+from tests.unit_tests.conftest import with_feature_flags
+
+
+@with_feature_flags(ALERT_REPORTS=True)
+@patch("superset.reports.api.get_channels_with_search")
+def test_slack_channels_success(
+    mock_search: Any,
+    client: Any,
+    full_api_access: None,
+) -> None:
+    mock_search.return_value = [{"id": "C123", "name": "general"}]
+    params = prison.dumps({})
+    rv = client.get(f"/api/v1/report/slack_channels/?q={params}")
+    assert rv.status_code == 200
+    data = rv.json
+    assert data["result"] == [{"id": "C123", "name": "general"}]
+
+
+@with_feature_flags(ALERT_REPORTS=True)
+@patch("superset.reports.api.get_channels_with_search")
+def test_slack_channels_handles_superset_exception(
+    mock_search: Any,
+    client: Any,
+    full_api_access: None,
+) -> None:
+    mock_search.side_effect = SupersetException("Slack API error")
+    params = prison.dumps({})
+    rv = client.get(f"/api/v1/report/slack_channels/?q={params}")
+    assert rv.status_code == 422
+    assert "Slack API error" in rv.json["message"]