Fixtures can also be parametrized directly. When a fixture is parametrized, all tests that use the fixture will now run multiple times, once for each parameter. This is an excellent tool to use when we have variants of a fixture and each test that uses the fixture should also run with all variants.
In the previous chapter, we saw an example of parametrization using multiple implementations of a serializer:
@pytest.mark.parametrize(
"serializer_class",
[JSONSerializer, XMLSerializer, YAMLSerializer],
)
class Test:
def test_quantity(self, serializer_class):
serializer = serializer_class()
quantity = Quantity(10, "m")
data = serializer.serialize_quantity(quantity)
new_quantity = serializer.deserialize_quantity(data)
assert new_quantity == quantity
def test_pipe(self, serializer_class):
...
