Test stage error in the pipeline

[yufei-w]

Describe the problem
In build stage, the testing returns an error with the following messages:

ERROR: Could not find a version that satisfies the requirement nosetests (from versions: none)
ERROR: No matching distribution found for nosetests
WARNING: You are using pip version 21.2.4; however, version 21.3.1 is available.
You should consider upgrading via the '/usr/local/bin/python -m pip install --upgrade pip' command.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'devops-21fall-shopcart | Delivery Pipeline'
2. Click on 'Run stage Build'
3. See error

Expected behavior
Test job passes.

Observed behavior
Test job failed