pytest-dblift
pytest plugin for DBLift. It applies your migrations in tests and exposes a DBLiftClient.
This is a separate PyPI package, not dblift[pytest].
Install
SQLite (default, stdlib driver):
pip install pytest-dblift
Any other engine: install the matching dblift extra so the native driver is present. The plugin does not install drivers and does not open a second connection — it calls create_engine(url) then DBLiftClient.from_sqlalchemy.
pip install pytest-dblift "dblift[postgresql]"
pytest --dblift-url "postgresql+psycopg://user:pass@localhost/app_test"
Quickstart
def test_schema(dblift_migrated_db, dblift_client):
info = dblift_client.info()
assert info.pending_migrations == []
dblift_migrated_db applies pending migrations (function scope). dblift_client is a session-scoped DBLiftClient. No fixture is autouse: request what you need.
Fixtures
| Fixture | Scope | Role |
|---|---|---|
dblift_config |
session | Dict with url, migrations_dir, optional schema. Override in conftest.py. |
dblift_engine |
session | SQLAlchemy engine from that URL. Override to inject your app engine. |
dblift_client |
session | DBLiftClient.from_sqlalchemy(...). |
dblift_migrated_db |
function | client.migrate(), then yield the client. |
dblift_empty_db |
function | client.clean(clean_enabled=True), then yield the client. |
dblift_validate |
function | Callable: dblift_validate(**kwargs) runs client.validate and asserts success. |
dblift_undo |
function | Callable: dblift_undo(**kwargs) runs client.undo and asserts success. Does not migrate. |
Undo uses companion U* scripts (same as dblift). There is no undo() function inside a V*.py file.
def test_rollback(dblift_migrated_db, dblift_undo):
result = dblift_undo(target_version="0")
assert result.success
Override config in tests/conftest.py:
import pytest
@pytest.fixture(scope="session")
def dblift_config():
return {
"url": "postgresql+psycopg://user:pass@localhost/app_test",
"migrations_dir": "migrations",
}
CLI options
| Option | What it does |
|---|---|
--dblift-url |
Database URL when dblift_config is not overridden. Default: a temp SQLite file. |
--dblift-migrations-dir |
One migrations directory (not a comma-separated list). Default: migrations. |
pytest-xdist: only the default SQLite file is per-worker (test_gw0.db, …). A URL you pass with --dblift-url is used as-is.
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