Use the Django TestCase's Client

[tnightingale]

Use the django.test.Client instance that Django provides with its TestCase class.

This allows GraphQL tests to make use of the stateful client methods like client.login().

[ulgens]

ping @jkimbo

[jkimbo]

Seems like a good change @tnightingale but the automated tests are failing. Can you fix them?

[stale]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[ulgens]

@tnightingale @zbyte64 Any change we rebase & merge this?

[zbyte64]

Looks like graphene_django/tests/test_utils.py needs to be updated to reference GraphqlTestCase? Seeing ModuleNotFoundError: No module named 'graphene_django.utils.testing.Client'; 'graphene_django.utils.testing' is not a package

Not sure how master is passing but this does not...

[ulgens]

This PR can be closed, thanks to #1084