Please tell us the meaning of the sentence

[tkoyama010]

The with the input of both 0 and part is missing information and cannot be read. Please tell us what you are trying to convey.

python-package-guide/tests/write-tests.md

Line 84 in 53e10d6

- **Test special cases:** Sometimes there are special or outlier cases. For instance, if a function performs a specific calculation that may become problematic closer to the value = 0, test it with the input of both 0 and

[sneakers-the-rat]

I think it may have gotten blurred together with the example after it?

I think for the idea of testing special cases, one familiar example might be dividing by zero. Something like

Test special cases: Sometimes there are special or outlier cases. For instance, you may have some function that divides x / y: divide(x,y). Write a test for your function with y = 0 to ensure that it handles the special case correctly.

except i don't have my writing voice on right now and it could use a bit of @lwasser 's writing voice in it :)

[lwasser]

Gosh - this specific line came from a review - possibly david or someone else. But i think Jonny has it right :)

We want to encourage people to think about edge cases where something might fail. so division by 0. I don't now if there is some calculation where as a number gets really small it could fail, ect. I think the take away is

"make sure that your tests consider edge cases".

and we could add another take away that would say

if you find a bug around an edge case, add a test that covers it!

i hope that helps @tkoyama010 !! i am not sure if you are still working on this or not. i'm just going through OLD notifications and also cleaning up issues and pr's that maybe can be closed!

[tkoyama010]

@all-contributors please add @sneakers-the-rat and @lwasser for question

[allcontributors]

@tkoyama010

I've put up a pull request to add @sneakers-the-rat! 🎉

[tkoyama010]

@all-contributors please add @lwasser for question

[allcontributors]

@tkoyama010

I've put up a pull request to add @lwasser! 🎉