feat: add governed payment request slice

tests/test_migrations.py

@@ -0,0 +1,42 @@
+from __future__ import annotations
+
+from pathlib import Path
+import tempfile
+import unittest
+
+from alembic.runtime.migration import MigrationContext
+from sqlalchemy import create_engine, inspect
+
+from govoplan_core.db.migrations import migrate_database
+from govoplan_payments.backend.manifest import get_manifest
+
+
+class PaymentsMigrationTests(unittest.TestCase):
+    def test_fresh_migration_creates_payment_evidence_tables(self) -> None:
+        with tempfile.TemporaryDirectory(prefix="govoplan-payments-") as directory:
+            url = f"sqlite:///{Path(directory) / 'payments.db'}"
+            migrate_database(
+                database_url=url,
+                enabled_modules=("payments",),
+                manifest_factories=(get_manifest,),
+            )
+            engine = create_engine(url)
+            try:
+                self.assertTrue(
+                    {
+                        "payment_obligations",
+                        "payment_reconciliations",
+                        "payment_events",
+                    }.issubset(set(inspect(engine).get_table_names()))
+                )
+                with engine.connect() as connection:
+                    self.assertIn(
+                        "e7b9c1d3f5a7",
+                        set(MigrationContext.configure(connection).get_current_heads()),
+                    )
+            finally:
+                engine.dispose()
+
+
+if __name__ == "__main__":
+    unittest.main()