R11BRT-1992 add information about how to execute the tests locally (#158)

Author: RicardoLucasM

test/unit/Readme.md

@@ -0,0 +1,39 @@
+# Requirements
+
+Validate if you have `Pester` version 4.10.1 at least to run the tests
+
+```
+Get-Module Pester -ListAvailable
+```
+
+By default `Powershell` comes with 3.4.0 but we need at least 4.10.1 for some of our tests otherwise they will fail.
+
+
+```
+Install-Module Pester -RequiredVersion 4.10.1
+```
+
+------
+
+# How to run tests
+
+To execute tests, we need to use `Invoke-Pester` with the test file and the `-PassThru` option.
+
+For example:
+
+```
+Invoke-Pester .\Install-OSServer.Tests.ps1 -PassThru
+```
+
+# Cleanup
+
+You can remove the `Pester` module from the `PowerShell` by executing the following command:
+
+
+```
+Uninstall-Module Pester -AllVersions
+```
+
+You may need to close the `PowerShell` that was executing the tests.
+
+Note: This will leave 3.4.0 which is the default by `PowerShell`