I'm having some trouble dealing with the nested tuple which Mock.call_args_list
returns.
def test_foo(self):
def foo(fn):
fn('PASS and some other stuff')
f = Mock()
foo(f)
foo(f)
foo(f)
for call in f.call_args_list:
for args in call:
for arg in args:
self.assertTrue(arg.startswith('PASS'))
I would like to know if there is a better way to unpack that call_args_list on the mock object in order to make my assertion. This loop works, but it feels like there must be a more straight forward way.
I think that many of the difficulties here are wrapped up in the treatment of the "call" object. It can be thought of as a tuple with 2 members (args, kwargs)
and so it's frequently nice to unpack it:
args, kwargs = call
Once it's unpacked, then you can make your assertions separately for args and kwargs (since one is a tuple and the other a dict)
def test_foo(self):
def foo(fn):
fn('PASS and some other stuff')
f = Mock()
foo(f)
foo(f)
foo(f)
for call in f.call_args_list:
args, kwargs = call
self.assertTrue(all(a.startswith('PASS') for a in args))
Note that sometimes the terseness isn't helpful (e.g. if there is an error):
for call in f.call_args_list:
args, kwargs = call
for a in args:
self.assertTrue(a.startswith('PASS'), msg="%s doesn't start with PASS" % a)