---

examples/testing-demo/doctest_fail/mymath.py

def add(x, y):
    """
    This function will add two numbers together
    >>> add(2, 2)
    4
    >>> add(3, 3)
    6
    >>>
    And here we can have more documentation.
    """
    return x * y

def multiply(x, y):
    return x + y

# Yes, I know there are bugs in this code!

************************************************
File "mymath.py", line 5, in mymath.add
Failed example:
    add(3, 3)
Expected:
    6
Got:
    9
************************************************
1 items had failures:
   1 of   2 in mymath.add
***Test Failed*** 1 failures.

$ python -m doctest mymath.py
$ echo $?
1

> python -m doctest mymath.py
> echo %ERRORLEVEL%
1