def test_create_with_existing_key(self):
"""Test that creating and item with an existing key raises an exception."""
collection = CRUDCollection()
collection.create("one", 1)
with pytest.raises(ValueError, match="Item with name .* already present"):
collection.create("one", 1)
def test_read_all(self):
"""Test that the read_all method works correctly."""
collection = CRUDCollection()
collection.create("one", 1)
collection.create("two", 2)
keyvalue_pairs = collection.read_all()
assert {("one", 1), ("two", 2)} == set(keyvalue_pairs)
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_keys(self):
"""Test the keys method."""
collection = CRUDCollection()
collection.create("one", 1)
collection.create("two", 2)
keyvalue_pairs = collection.keys()
assert {"one", "two"} == set(keyvalue_pairs)
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