The following file,
import math
def square_root(n):
"""
>>> square_root(4)
2.0
>>> square_root(-1)
Traceback (most recent call last):
...
AssertionError: number must not be negative
"""
assert n>= 0, 'number must not be negative'
return math.sqrt(n)works well with the doctest of stdlib,
$ python -m doctest test.py
$ echo $?
0
but it fails using pytest:
$ python -m doctest test.py
$ pytest --doctest-modules test.py
============================= test session starts ==============================
platform linux -- Python 3.11.6, pytest-8.2.1, pluggy-1.5.0
rootdir: /tmp
collected 1 item
test.py F [100%]
=================================== FAILURES ===================================
__________________________ [doctest] test.square_root __________________________
004
005 >>> square_root(4)
006 2.0
007
008 >>> square_root(-1)
Differences (unified diff with -expected +actual):
@@ -1,3 +1,9 @@
Traceback (most recent call last):
- ...
+ File "/usr/lib/python3.11/doctest.py", line 1351, in __run
+ exec(compile(example.source, filename, "single",
+ File "<doctest test.square_root[1]>", line 1, in <module>
+ square_root(-1)
+ File "/tmp/test.py", line 14, in square_root
+ assert n>= 0, 'number must not be negative'
AssertionError: number must not be negative
+assert -1 >= 0
/tmp/test.py:8: DocTestFailure
=========================== short test summary info ============================
FAILED test.py::test.square_root
============================== 1 failed in 0.01s ===============================
due to that assert -1 >= 0 extra line
The following file,
works well with the doctest of stdlib,
but it fails using pytest:
due to that
assert -1 >= 0extra line