Add unit test for the caterpillar project

[Gabriela20103967]

Description

The purpose of this pull request is adding a test case to verify that the 'try again' function is work as expected, to demonstrate the effectiveness of this unit test, I add a screenshot of the status of the code

A short summary of what is included in your Pull Request.

Fixes #286

• [ ] Issue_no: <286>
• [ ] Not applicable

Type of change

Choosing one or more options from the following as per the nature of your Pull request.

• [ ] New project insert
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Documentation Update

Project

• Project Name: Caterpillar Game

Checklist:

Please tick all the boxes that are fulfilled by your Pull Request.

• [ ] I have named my files and folder, according to this project's guidelines.
• [x] My code follows the style guidelines of this project.
• [ ] I have commented on my code, particularly in hard-to-understand areas.
• [ ] I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• [x] My changes do not produce any warnings.