[pytest-dev] Customising repr() output for super-expressions of failed assertions

[Craig de Stigter]

Hi there

Considering this failed assertion where a django test request failed:

```
>       assert r.status_code == 201
E       assert 400 == 201
E         -400
E         +201
```

This output isn't terribly useful at present. We'd like to automatically
dump the request body (`r.content`) in the output, wherever it's a django
response object, to aid debugging.

I see the `pytest_assertrepr_compare` hook gets passed the top-level
objects and the operator for writing a custom message. However if I'm
reading it right there's no way to access the containing expression there
(i.e. `r`) and treat it specially.

Is there a way to do this using pytest's hooks?

Cheers
Craig de Stigter
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