Printing after assert with unittesting in Python

Question

I am trying to print the item that rose as exception when I run my unit tests. For example:

def test_string(self):
   my_str = "new string"
   self.assertTrue(len(my_str) == 5)

This is a very simplified example but it shows what I am trying to achieve. I want, in that case, for the test to print "new string" after I get 'F'.

In regular assert I can achieve that by doing:

assert (len(my_str) == 5), "new string"

But when using unittest it won't work.

Is there a way to do that with unittest ?

For starters, use self.assertEqual(len(my_str), 5). Also, use pytest if you can, then you can write regular asserts and it'll still show you the failing values. — Alex Hall
– Alex Hall, Commented Jul 5, 2021 at 10:45

Ofir Gottesman · Accepted Answer · 2021-07-05 10:04:40Z

2

You can use

 self.assertTrue(len(str) == 5, msg="new string")

answered Jul 5, 2021 at 10:04

Ofir Gottesman

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