doctest.testfile() confuses source detection · Issue #52 · nedbat/coveragepy (original) (raw)
Originally reported by Julian O (Bitbucket: oddthinking, GitHub: oddthinking)
The doctest.testmod() method searches the current file for comments of a specific format, and runs them as a test. When I use that, coverage.py does an excellent job.
The doctest.testfile() method searches another file for the comments, and runs them as a test. When I use that, coverage.py complains that it is unable to find the source code.
I did not expect the .doctest file to give me a percentage coverage, but I did hope it would be able to understand the format of the filename, and to handle it gracefully.
Note: This is an different issue to <<issue 19>>.
Here is an example:
- File 1: factorial_testfile.py
def factorial(n):
""" Compute the factorial of a natural number."""
if n == 0:
return 1
else:
return n * factorial(n-1) if name == "main":
import doctest
doctest.testfile("factorial.doctest")
- File 2: factorial.doctest
from factorial_testfile import factorial
factorial(0)
1
factorial(1)
1
factorial(3)
6
Here is what happens (under Windows, Python 2.6).
C:\temp\coveragetest>coverage run factorial_testfile.py
C:\temp\coveragetest>coverage report -m
Name Stmts Exec Cover Missing
--------------------------------------------------
<doctest factorial NoSource: No source for code: 'c:\\temp\\coveragetest\\<doctest factorial.doctest[0]>': [Errno 22] invalid mode ('rU') or filename: 'c:\\temp\\coveragetest\\<doctest factorial.doctest[0]>'
<doctest factorial NoSource: No source for code: 'c:\\temp\\coveragetest\\<doctest factorial.doctest[3]>': [Errno 22] invalid mode ('rU') or filename: 'c:\\temp\\coveragetest\\<doctest factorial.doctest[3]>'
<doctest factorial NoSource: No source for code: 'c:\\temp\\coveragetest\\<doctest factorial.doctest[1]>': [Errno 22] invalid mode ('rU') or filename: 'c:\\temp\\coveragetest\\<doctest factorial.doctest[1]>'
<doctest factorial NoSource: No source for code: 'c:\\temp\\coveragetest\\<doctest factorial.doctest[2]>': [Errno 22] invalid mode ('rU') or filename: 'c:\\temp\\coveragetest\\<doctest factorial.doctest[2]>'
factorial_testfile 7 7 100%