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docs/testing.md

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+# Integration Test Setup
+
+The backend integration tests talk to a real Postgres database. To spin up an ephemeral instance locally, use the dedicated compose file:
+
+```bash
+docker compose -f docker-compose.test.yml up -d
+```
+
+This starts Postgres on port `5433` with the database/user both named `papercrate` and password `papercrate_test`. Point the test harness at it:
+
+```bash
+export TEST_DATABASE_URL=postgres://papercrate:papercrate_test@localhost:5433/papercrate_test
+```
+
+Run the tests as usual:
+
+```bash
+cargo test
+```
+
+When you are done, stop the container:
+
+```bash
+docker compose -f docker-compose.test.yml down
+```
+
+The compose file uses a tmpfs volume, so each run starts with a clean database.