[Tutor] Problem with testing - container

[Shall, Sydney]

I have a problem with a specific test, I think.

I use a Mac with OS X 10.13.3
I use Anaconda with Python 3.5

I have been writing tests for a Class that I have written. I am not 
finished yet, but there are already nearly 400 tests. The tests run and 
return OK. [After cleaning up many silly mistakes that I made.]

However, now, when I run the tests (Unittest) I get the following warning:
....
lib/python3.5/unittest/case.py:1092: FutureWarning: elementwise 
comparison failed; returning scalar instead, but in the future will 
perform elementwise comparison
   if member in container:
...

No other information is given.

My problem is, how do I find out where exactly the problem originates.
-- 
Sydney
-- 

_________

Professor Sydney Shall
Department of Haematology/Oncology
Phone: +(0)2078489200
E-Mail: sydney.shall
[Correspondents outside the College should add @kcl.ac.uk]