Resolve the issues raised in helloworld_tests.py

[7tena]

• Navigate to src\unittest\python\helloworld_tests.py
• Get rid of the bugs encountered. The screenshot of the same is attached below.
  

[7tena]

-The first problem can be resolved by running the following command:
pip install mockito

[abose]

This could be fixed by changing the file: https://github.com/aicore/Template-PythonProject/blob/main/.idea/CloudLedger.iml

• change content from <content url="file://$MODULE_DIR$" /> to

<content url="file://$MODULE_DIR$">
      <sourceFolder url="file://$MODULE_DIR$/src/main/python" isTestSource="false" />
 </content>

• Also rename from cloudLedger.iml to template_python_project.imp or something and verify loading in pycharm
  https://stackoverflow.com/questions/21236824/unresolved-reference-issue-in-pycharm