Does assertRaises work on builtin exceptions

Question

I have a function that wraps os remove.
I have unit test setup as follows:

self.assertRaises(FileNotFoundError, my_rm(bad_file_path))

bad_file_path does not exist, so it throws exception. However, the above still fails testing. How could I test for FileNotFoundError, if possible?

The answer posted above is correct. Duplicate. – Jacob Aug 02 '16 at 19:37 — Jacob, Aug 02 '16 at 19:37

score 1 · Answer 1 · answered Aug 02 '16 at 18:07

The documentation recommends that you use with to run assertRaises tests, like this:

with self.assertRaises(FileNotFoundError):
    my_rm(bad_file_path)

Otherwise, you would have to pass in the function and arguments separately, like this:

self.assertRaises(FileNotFoundError, my_rm, bad_file_path)

What you're currently doing is calling my_rm(bad_file_path) and trying to pass the result of that call to self.assertRaises(). Since an exception occurs, the test crashes.

Does assertRaises work on builtin exceptions

1 Answers1