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#14649: clarify DocTestSuite error when there are no docstrings.

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Also adds tests to verify the documented behavior (which is probably a bug, as
indicated in the added comments).

Patch by Chris Jerdonek.
This commit is contained in:
R David Murray 2012-09-10 10:17:13 -04:00
parent 7a8634d8d8
commit 8d580539f0
4 changed files with 57 additions and 6 deletions
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7
Lib/doctest.py
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@ -2381,7 +2381,12 @@ def DocTestSuite(module=None, globs=None, extraglobs=None, test_finder=None,
elif not tests:
# Why do we want to do this? Because it reveals a bug that might
# otherwise be hidden.
raise ValueError(module, "has no tests")
# It is probably a bug that this exception is not also raised if the
# number of doctest examples in tests is zero (i.e. if no doctest
# examples were found). However, we should probably not be raising
# an exception at all here, though it is too late to make this change
# for a maintenance release. See also issue #14649.
raise ValueError(module, "has no docstrings")
tests.sort()
suite = unittest.TestSuite()