feat: orchestrate governed tenant erasure

tests/test_migrations.py

@@ -0,0 +1,45 @@
+from __future__ import annotations
+
+import importlib
+import tempfile
+from pathlib import Path
+
+from alembic.runtime.migration import MigrationContext
+from sqlalchemy import create_engine, inspect
+
+from govoplan_core.db.migrations import migrate_database
+from govoplan_tenancy.backend.manifest import get_manifest
+
+
+def test_tenant_erasure_migration_is_declared() -> None:
+    migration = importlib.import_module(
+        "govoplan_tenancy.backend.migrations.versions."
+        "b3d8e1f4a6c2_v021_tenant_erasure_operations"
+    )
+
+    assert migration.revision == "b3d8e1f4a6c2"
+    assert migration.down_revision is None
+    assert migration.branch_labels == ("module:tenancy",)
+
+
+def test_tenancy_migration_creates_erasure_operation_table_and_head() -> None:
+    with tempfile.TemporaryDirectory(prefix="govoplan-tenancy-migration-") as directory:
+        url = f"sqlite:///{Path(directory) / 'tenancy.db'}"
+        migrate_database(
+            database_url=url,
+            enabled_modules=("tenancy",),
+            manifest_factories=(get_manifest,),
+        )
+        engine = create_engine(url)
+        try:
+            with engine.connect() as connection:
+                assert "b3d8e1f4a6c2" in set(
+                    MigrationContext.configure(connection).get_current_heads()
+                )
+                assert {
+                    name
+                    for name in inspect(connection).get_table_names()
+                    if name.startswith("tenancy_")
+                } == {"tenancy_erasure_operations"}
+        finally:
+            engine.dispose()