add test for unrecognized node URLs

tests/test_query.py

@@ -0,0 +1,47 @@
+import pytest
+
+from app.api import crud
+
+
+@pytest.fixture
+def mock_invalid_get():
+    """Mock get function that does not return any response (for testing invalid parameter values)."""
+
+    async def mockreturn(
+        min_age,
+        max_age,
+        sex,
+        diagnosis,
+        is_control,
+        min_num_sessions,
+        assessment,
+        image_modal,
+        node_urls,
+    ):
+        return None
+
+    return mockreturn
+
+
+@pytest.mark.parametrize(
+    "invalid_node_url_list",
+    [
+        [
+            "https://api.neurobagel.org/",
+            "https://mysterynode.org/",
+        ],  # can probably change this to set an environment variable
+        ["http://unknownnode.org", "https://mysterynode.org/"],
+    ],
+)
+def test_get_invalid_node_urls(
+    test_app, mock_invalid_get, monkeypatch, invalid_node_url_list
+):
+    """Given a node URL list that contains URL(s) not recognized by the API instance, returns an informative 422 error response."""
+
+    monkeypatch.setattr(crud, "get", mock_invalid_get)
+
+    response = test_app.get(
+        f"/query/?node_url={invalid_node_url_list[0]}&node_url={invalid_node_url_list[1]}"
+    )
+    assert response.status_code == 422
+    assert "Unrecognized Neurobagel node URL(s)" in response.text