Alexander Hess
fdcc93a1ea
- use SQLAlchemy (and PostgreSQL) to model the ORM layer
- add the following models:
+ Address => modelling all kinds of addresses
+ City => model the three target cities
+ Courier => model the UDP's couriers
+ Customer => model the UDP's customers
+ Order => model the orders received by the UDP
+ Restaurant => model the restaurants active on the UDP
- so far, the emphasis lies on expression the Foreign Key
and Check Constraints that are used to validate the assumptions
inherent to the cleanded data
- provide database-independent unit tests with 100% coverage
- provide additional integration tests ("e2e") that commit data to
a PostgreSQL instance to validate that the constraints work
- adapt linting rules a bit
80 lines
2.5 KiB
Python
80 lines
2.5 KiB
Python
"""Test the ORM's Restaurant model."""
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import pytest
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from sqlalchemy import exc as sa_exc
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from sqlalchemy.orm import exc as orm_exc
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from urban_meal_delivery import db
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class TestSpecialMethods:
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"""Test special methods in Restaurant."""
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# pylint:disable=no-self-use
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def test_create_restaurant(self, restaurant_data):
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"""Test instantiation of a new Restaurant object."""
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result = db.Restaurant(**restaurant_data)
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assert result is not None
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def test_text_representation(self, restaurant_data):
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"""Restaurant has a non-literal text representation."""
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restaurant = db.Restaurant(**restaurant_data)
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name = restaurant_data['name']
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result = repr(restaurant)
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assert result == f'<Restaurant({name})>'
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@pytest.mark.e2e
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@pytest.mark.no_cover
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class TestConstraints:
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"""Test the database constraints defined in Restaurant."""
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# pylint:disable=no-self-use
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def test_insert_into_database(self, restaurant, db_session):
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"""Insert an instance into the database."""
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db_session.add(restaurant)
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db_session.commit()
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def test_dublicate_primary_key(self, restaurant, restaurant_data, db_session):
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"""Can only add a record once."""
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db_session.add(restaurant)
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db_session.commit()
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another_restaurant = db.Restaurant(**restaurant_data)
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db_session.add(another_restaurant)
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with pytest.raises(orm_exc.FlushError):
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db_session.commit()
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def test_delete_a_referenced_address(self, restaurant, address, db_session):
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"""Remove a record that is referenced with a FK."""
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db_session.add(restaurant)
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db_session.commit()
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with pytest.raises(sa_exc.IntegrityError):
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db_session.execute(
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db.Address.__table__.delete().where( # noqa:WPS609
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db.Address.id == address.id,
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),
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)
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def test_negative_prep_duration(self, restaurant, db_session):
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"""Insert an instance with invalid data."""
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restaurant.estimated_prep_duration = -1
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db_session.add(restaurant)
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with pytest.raises(sa_exc.IntegrityError):
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db_session.commit()
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def test_too_high_prep_duration(self, restaurant, db_session):
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"""Insert an instance with invalid data."""
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restaurant.estimated_prep_duration = 2500
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db_session.add(restaurant)
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with pytest.raises(sa_exc.IntegrityError):
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db_session.commit()
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