Unit tests run only if `adb` is installed on the systems

## Expected Behavior
Unit tests should run on all systems, regardless of tools being installed on the system.

## Current Behavior
Unit tests run only on systesm that have `adb` installed.

## Possible Solution
The current unit test make use of the real fileSystem - one possible solution would be to use the `FakeFileSystem` that is part of `Cake.Testing`

## Steps to Reproduce (for bugs)
1. make sure `adb` is not installed
2. build solution
3. run unit tests

## Context
Having the unit test not run makes it a bit hard to try to work on this project.

## Your Environment
* Module version used: Source
* Operating System and PowerShell version: PowerShell 7.1.4 on Win10