New issue 549: Provide option for message & diff.
https://bitbucket.org/hpk42/pytest/issue/549/provide-option-for-message-diff
Sarah Bird:
Currently, if I have a test:
```
#!python
def test_string():
assert 'my silly string' == 'my not so silly string'
```
Then I get the fail message:
```
#!shell
E assert 'my silly string' == 'my not so silly string'
E - my silly string
E + my not so silly string
E ? +++++++
```
With all its pytest helpful diff glory.
If I have the test:
```
#!python
def test_string():
assert 'my silly string' == 'my not so silly string', 'Silly strings should
always match.'
```
I get the fail message:
```
#!shell
E AssertionError: Silly strings should always match.
```
I discussed this a little with the pytest team sprinting at EuroPython and this
is correct in the sense that a message is meant to be the defining output. But
at the same time, as soon as I use a message I have no way to access all of
pytest's helpful diffing and I'd like a way. It may be a tag like
--message-full, but I'd love to get the error message:
```
#!shell
E AssertionError: Silly strings should always match.
E
E assert 'my silly string' == 'my not so silly string'
E - my silly string
E + my not so silly string
E ? +++++++
```
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