Tests/dataset model

[nifedara]

What does this PR do?

Adds backend test case

• I added a new test file for core/model test
• I added a test for dataset creation
• I added factories.py file (using factory_boy) to isolate test data
• Contributes to resolving this issue: Implement Backend Test Cases for fAIr hotosm/fAIr#229

Consideration?

• Although some might suggest not testing a model that doesn't have a return statement, I added a test for this as it is nice to have
• I ensured to use Black formatter
• I used coverage to see test coverage but didn't add that to the requirement file and factory_boy to isolate test data. So to check coverage, you will have to install coverage yourself and also install factory_boy:
  • pip install coverage and pip install factory_boy

How to test?

• Clone this repo
• Follow the installation guide
• run docker exec -it api bash to run the following commands in the container:
  • coverage run --omit='*/usr/*' manage.py test tests.test_login_model
  • or just coverage run manage.py test tests.test_login_model
  • coverage report (to see a report of the test coverage)