How to use the dockerflow.flask.checks.check_migrations_applied function in dockerflow

def test_check_migrations_applied_success(mocker, db, migrate):
    get_heads = mocker.patch(
        "alembic.script.ScriptDirectory.get_heads", return_value=("17164a7d1c2e",)
    )
    get_current_heads = mocker.patch(
        "alembic.migration.MigrationContext.get_current_heads",
        return_value=("17164a7d1c2e",),
    )
    errors = checks.check_migrations_applied(migrate)
    assert get_heads.called
    assert get_current_heads.called
    assert len(errors) == 0

def test_check_migrations_applied_cannot_check_migrations(
    exception, mocker, db, migrate
):
    engine_connect = mocker.patch.object(db.engine, "connect")
    engine_connect.side_effect = exception
    errors = checks.check_migrations_applied(migrate)
    assert len(errors) == 1
    assert errors[0].id == health.INFO_CANT_CHECK_MIGRATIONS

def test_check_migrations_applied_unapplied_migrations(mocker, db, migrate):
    get_heads = mocker.patch(
        "alembic.script.ScriptDirectory.get_heads", return_value=("7f447c94347a",)
    )
    get_current_heads = mocker.patch(
        "alembic.migration.MigrationContext.get_current_heads",
        return_value=("73d96d3120ff",),
    )
    errors = checks.check_migrations_applied(migrate)
    assert get_heads.called
    assert get_current_heads.called
    assert len(errors) == 1
    assert errors[0].id == health.WARNING_UNAPPLIED_MIGRATION