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27cb224d5d
Add naming_convention to Base.metadata so Alembic batch-mode reflection can match unnamed FK constraints created by migration 0002. Pass naming_convention and render_as_batch=True through env.py online config. Add migration roundtrip tests (upgrade/downgrade/cycle from baseline). Amp-Thread-ID: https://ampcode.com/threads/T-019ce466-1683-7471-b6e1-bb078223cda0 Co-authored-by: Amp <amp@ampcode.com>
58 lines
1.8 KiB
Python
58 lines
1.8 KiB
Python
"""Test that Alembic migrations run cleanly on a file-backed SQLite DB.
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This catches problems like unnamed FK constraints that prevent batch-mode
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drop_constraint from working on real SQLite files (see MB-2).
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Migrations 0001 and 0002 are already shipped, so we only exercise
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upgrade/downgrade for 0003+.
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"""
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import os
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import pytest
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from alembic import command
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from alembic.config import Config
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# Oldest shipped revision — we upgrade to here as a baseline and never
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# downgrade past it.
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_BASELINE = "0002_merge_to_asset_references"
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def _make_config(db_path: str) -> Config:
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root = os.path.join(os.path.dirname(__file__), "../..")
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config_path = os.path.abspath(os.path.join(root, "alembic.ini"))
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scripts_path = os.path.abspath(os.path.join(root, "alembic_db"))
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cfg = Config(config_path)
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cfg.set_main_option("script_location", scripts_path)
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cfg.set_main_option("sqlalchemy.url", f"sqlite:///{db_path}")
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return cfg
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@pytest.fixture
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def migration_db(tmp_path):
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"""Yield an alembic Config pre-upgraded to the baseline revision."""
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db_path = str(tmp_path / "test_migration.db")
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cfg = _make_config(db_path)
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command.upgrade(cfg, _BASELINE)
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yield cfg
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def test_upgrade_to_head(migration_db):
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"""Upgrade from baseline to head must succeed on a file-backed DB."""
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command.upgrade(migration_db, "head")
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def test_downgrade_to_baseline(migration_db):
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"""Upgrade to head then downgrade back to baseline."""
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command.upgrade(migration_db, "head")
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command.downgrade(migration_db, _BASELINE)
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def test_upgrade_downgrade_cycle(migration_db):
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"""Full cycle: upgrade → downgrade → upgrade again."""
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command.upgrade(migration_db, "head")
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command.downgrade(migration_db, _BASELINE)
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command.upgrade(migration_db, "head")
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