pytest assertion message not displayed in helper function within same test module in pycharm

Question

I'm seeing that assertion messages do not seem to be displayed if the assertion occurs in a helper method within the same module as my test when in PyCharm.

This only seems to be happening in PyCharm - it does not happen when running from the command line.

This works:

def test_assertion_message_working():
  assert 1 == 2, "my message"

Expected :2
Actual :1
...
def test_assertion_message_working():
> assert 1 ==2, "my message"

But this doesn't (the test fails, but I do not get the failure message):

def test_assertion_message_not_working():
  do_assertion()

def do_assertion():
  assert 1 == 2, "my message"

1 != 2

Expected :2 
Actual :1
...
def test_assertion_not_working():
>  do_assertion()

Wondering if there is any setting (or workaround) I need to apply to get this working?

Answer 1

Add the next additional flag to the run configuration Additional Arguments: --tb=short

You can edit the configuration templates to make it the default.

More info can be found here: https://youtrack.jetbrains.com/issue/PY-49150/pytest-output-in-PyCharm-lacks-information-about-assertion-failures-in-helper-methods