Support serialising JSON types other than objects in Django Test Client

[Dan Palmer]

This is a follow up to #29082, which added support for serialising JSON objects in the Django Test Client.

Currently JSON types other than objects are not supported.

This is my first ticket (I think), so any advice on what's required would be appreciated. I'm planning to open a PR on GitHub for this.

[Tim Graham]

Does using a custom encoder with test client's json_encoder parameter solve your issue?

[Dan Palmer]

It doesn't - the bug is in the detection in the test client of whether to serialise with the encoder or not. I've fixed it in ​https://github.com/django/django/pull/10313

Help with documentation practices in that PR would be much appreciated!

[Adam Johnson]

This isn't a bug on 2.1, but the docs could be marginally clearer by saying it *only* happens when data is a dictionary.

Adding support for detecting arrays would be a 2.2 feature. But then it should probably detect all other types that json.dumps can do too - booleans, integers, floats, and strings? This could break more workflows, especially subtly as json.dumps on a string will normally just yield extra quote marks.

[Dan Palmer]

Great, I'll update the ticket/PR for that and document it as a 2.2 feature.