Chris Jerdonek added the comment:
> Every doctest is docstring from tested module, but not every docstring is a
> valid doctest.
Actually, I'm not sure even this is correct. doctest will form a unittest
*TestSuite* from a module if it has docstrings, but it will not necessarily
create a test for each docstring. You can see this by running code like the
following on a target module that contains an empty docstring:
suite = doctest.DocTestSuite('doctest_target')
print(repr(suite))
print(suite.countTestCases())
which outputs--
<unittest.suite.TestSuite tests=[]>
0
So while "tests" (in the doctest code) evaluates to True (because it is a
TestSuite instance), it still "has no tests." If it wants to check for tests,
it should probably be evaluating tests.countTestCases(), as David suggested.
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<http://bugs.python.org/issue14649>
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