New issue 556: Improve report when slaves collect different tests
https://bitbucket.org/hpk42/pytest/issue/556/improve-report-when-slaves-collect
Bruno Oliveira:
As described in #437 and #301, a test run stops when slaves collect a different
number of tests.
The code that raises the error is:
```python
# dsession.py:147
def init_distribute(self):
assert self.collection_is_completed
# XXX allow nodes to have different collections
node_collection_items = list(self.node2collection.items())
first_node, col = node_collection_items[0]
for node, collection in node_collection_items[1:]:
report_collection_diff(
col,
collection,
first_node.gateway.id,
node.gateway.id,
)
```
If instead of raising an `AssertionError` in `report_collection_diff` we just
`return None` if the collections differ, we obtain a better error message.
```
scheduling tests via LoadScheduling
=================================== ERRORS ====================================
_______ ERROR collecting source/python/ben10/_tests/pytest_fixtures.py ________
.env27\lib\site-packages\py\_path\local.py:620: in pyimport
__import__(modname)
x:\pytest_cx_freeze\pytest\_pytest\assertion\rewrite.py:134: in find_module
co = _read_pyc(fn_pypath, pyc)
x:\pytest_cx_freeze\pytest\_pytest\assertion\rewrite.py:312: in _read_pyc
co = marshal.load(fp)
E EOFError: EOF read where object expected
```
Which makes it easy to track down the source of the problem (btw, the above
issue has a proposed fix in pull request 192).
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