Description

Revisited tests (except screens folder) Added documentation for tests and made corrections.

Fixes #\

Type of change

Delete unchecked boxes (only for Type of change)

[X] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] This change requires a documentation update

Added documentation for tests. Tested using the Flutter framework to make sure the test is correct. using VS code and Android Studio.

Development Configuration Type "flutter --version" and "dart --version" in your CMD to check versions.

[x ] My code follows the style guidelines of this project
[x ] I have performed a self-review of my own code
[x] I have commented my code, particularly in hard-to-understand areas, if necessary
[x ] I have made corresponding changes to the documentation, if necessary
[x ] My changes generate no new warnings
[x ] I have added tests that prove my fix is effective or that my feature works, if necessary
[x] New and existing unit tests pass locally with my changes
[x] Any dependent changes have been merged and published in downstream modules
[ ] I have Acceptance Tested this on an iOS device
[ ] I have Acceptance Tested this on an Android device