Setup httpx_mock via marker instead of fixtures

RazerM commented 6 months ago

Resolves #137

We want to be able to configure how the httpx_mock fixture behaves at different scopes. A pytest marker can be used at module, class, or test scope and so is what is used here.

Providing a non-default value from the fixtures will emit a DeprecationWarning for each test with the exact marker it can be replaced with:

=================================== warnings summary ===================================
tests/test_tmp.py::test_a
tests/test_tmp.py::test_b
  /.../pytest_httpx/__init__.py:56: DeprecationWarning: The assert_all_responses_were_requested and non_mocked_hosts fixtures are deprecated.
  Use the following marker instead:

  pytest.mark.httpx_mock(assert_all_responses_were_requested=False)

    warnings.warn(

tests/test_tmp.py::test_c
  /.../pytest_httpx/__init__.py:56: DeprecationWarning: The assert_all_responses_were_requested and non_mocked_hosts fixtures are deprecated.
  Use the following marker instead:

  pytest.mark.httpx_mock(non_mocked_hosts=['example.com'])

    warnings.warn(