def test_delete(self):
"""Test that the delete method works correctly."""
collection = CRUDCollection()
collection.create("one", 1)
assert collection.read("one") == 1
collection.delete("one")
assert collection.read("one") is None
def test_update(self):
"""Test that the update method works correctly."""
collection = CRUDCollection()
collection.create("one", 1)
assert collection.read("one") == 1
collection.update("one", 2)
assert collection.read("one") == 2
def test_read_empty(self):
"""Test that reading with a non-existing key returns None."""
collection = CRUDCollection()
item = collection.read("one")
assert item is None
def test_read_not_empty(self):
"""Test that reading a previously created item gives a non-empty result."""
collection = CRUDCollection()
collection.create("one", 1)
item = collection.read("one")
assert item == 1