Currently, there are 3 different implementations of HttpClient. All of them have their own test file with duplicated test cases. Refactor the same tests to accept HttpClient (or some factory method) as test parameter to achieve something like this:

@pytest.mark.parametrize("http_client", [
  ImpitHttpClient(),
  CurlImpersonateHttpClient(),
  HttpxHttpClient(),
])
def some_http_client_test(http_client: HttpClient):
    ...