Add tests for data refresh task dependencies (WordPress#5027)

catalog/tests/dags/data_refresh/test_task_dependencies.py

@@ -0,0 +1,97 @@
+"""
+Tests vital dependencies for the data refresh: for example, ensuring that the indices have been
+created and refreshed before index promotion runs. These dependencies can be broken in
+unexpected ways so it is important to verify that the most critical ones are preserved.
+"""
+
+import logging
+
+from airflow.models import DagBag
+
+
+logger = logging.getLogger(__name__)
+
+
+def test_staging_schedule():
+    dagbag = DagBag()
+
+    # Assert that all of the staging data refresh DAGs
+    # have a schedule of None
+    for dag in [
+        dag for dag in dagbag.dags.values() if "staging_data_refresh" in dag.tags
+    ]:
+        assert dag.schedule_interval is None, (
+            "Staging data refresh DAGs must be on a `None` schedule"
+            " or risk breaking the load_sample_data script."
+        )
+
+
+def _assert_dependencies(downstream_task_id: str, upstream_task_ids: list[str]):
+    dag = DagBag().get_dag("staging_image_data_refresh")
+
+    downstream_task = dag.get_task(downstream_task_id)
+    # Get all upstream tasks for this task, not just the direct upstream tasks
+    upstream_tasks = downstream_task.get_flat_relative_ids(upstream=True)
+
+    for upstream_task_id in upstream_task_ids:
+        assert upstream_task_id in upstream_tasks
+
+
+def test_dependencies_alter_data_task():
+    _assert_dependencies(
+        downstream_task_id="alter_table_data.alter_data_batch",
+        upstream_task_ids=["copy_upstream_tables.copy_upstream_table.copy_data"],
+    )
+
+
+def test_dependencies_reindex_task():
+    _assert_dependencies(
+        downstream_task_id="run_distributed_reindex.reindex.trigger_reindexing_task",
+        upstream_task_ids=[
+            "copy_upstream_tables.copy_upstream_table.copy_data",
+            "alter_table_data.alter_data_batch",
+            "create_index",
+        ],
+    )
+
+
+def test_dependencies_create_and_populate_filtered_index_task():
+    _assert_dependencies(
+        downstream_task_id="create_and_populate_filtered_index.trigger_and_wait_for_reindex.trigger_reindex",
+        upstream_task_ids=[
+            "run_distributed_reindex.reindex.assert_reindexing_success",
+            "run_distributed_reindex.refresh_index",
+        ],
+    )
+
+
+def test_dependencies_promote_table_task():
+    _assert_dependencies(
+        downstream_task_id="promote_tables.promote_table.promote",
+        upstream_task_ids=[
+            "run_distributed_reindex.reindex.assert_reindexing_success",
+            "create_and_populate_filtered_index.refresh_index",
+            "promote_tables.promote_table.remap_table_indices_to_table.create_table_indices",
+            "promote_tables.promote_table.remap_table_constraints_to_table.apply_constraints_to_table",
+        ],
+    )
+
+
+def test_dependenceis_promote_index_task():
+    _assert_dependencies(
+        downstream_task_id="promote_index.point_new_alias",
+        upstream_task_ids=[
+            "run_distributed_reindex.refresh_index",
+            "promote_tables.promote_table.promote",
+        ],
+    )
+
+
+def test_dependenceis_promote_filtered_index_task():
+    _assert_dependencies(
+        downstream_task_id="promote_filtered_index.point_new_alias",
+        upstream_task_ids=[
+            "create_and_populate_filtered_index.refresh_index",
+            "promote_tables.promote_table.promote",
+        ],
+    )