Full diff of sequences should be displayed on assertion failures when verbose

[pytestbot]

Originally reported by: BitBucket: pombredanne, GitHub: pombredanne

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Today when tow sequences are compared, only the first different element is display with an ellipsis for the rest and there is no way to display a full sequence diff.

This means that other logging/print mechanisms must be used to display these on failure.
The proposed fix (pull request coming) is to enable a full sequence diff.

Note that while _pytest.assertion.util._compare_eq_sequence does not allow for these full diffs, _pytest.assertion.util._compare_eq_iterable does. And that _pytest.assertion.util._compare_eq_sequence has some commented out difflib calling code meaning that someone though about this at some point of time in the past...

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• Bitbucket: https://bitbucket.org/pytest-dev/pytest/issue/715

[pytestbot]

Original comment by BitBucket: pombredanne, GitHub: pombredanne:

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Fixed in https://bitbucket.org/pytest-dev/pytest/diff/_pytest/assertion/util.py?diff2=45921b2e6400&at=default