408 feature unit tests for dashboard view model

[rapiddeveloper]

What It Does

• Closes FEATURE - Write New Unit Tests for DashboardViewModel #408
• Tests MaintenanceEvents CRUD methods of DashboardViewModel

How I Tested

• Created a DashboardViewModel object in the Test init(). This object was used for most test cases. For test cases that thrown an error, a FailingFirebaseService was created. This allows me to test the failure paths in each method.

Notes

• This is my first contribution to this project. Feedback will be appreciated.