Test client using query_params raises ValueError when following redirect

[Marc Gibbons]

When the test client is called with query_params and follow=True, a ValueError is raised when following the redirect.

_follow_redirect populates data from the redirect URL's query string via QueryDict(url.query). Since query_params from the original request is never reset, both data and query_params end up non-empty, triggering: ValueError: query_params and data arguments are mutually exclusive.

Ref: ​https://github.com/django/django/blob/35dab0ad9ee2ed23101420cb0f253deda2818191/django/test/client.py#L998

Reproduction

def test_follow_redirect_with_query_params(self):
    self.client.get("/redirect_view/", query_params={"next": "x"}, follow=True)  # this yells

[GitHub <noreply@…>]

In 6c95af5c:

Fixed #36966 -- Fixed ValueError when query_params and follow are used on test client.