[macOS] move Pester tests to separate files/contexts/describes (#2573)

* [macOS] Fail Pester tests on error

* return it back

* added all files for testing

* common utils path changed

* linux scripts shouldn't be touched

images/macos/tests/Node.Tests.ps1

@@ -1,6 +1,8 @@
 Import-Module "$PSScriptRoot/../helpers/Common.Helpers.psm1"
 Import-Module "$PSScriptRoot/../helpers/Tests.Helpers.psm1" -DisableNameChecking
 
+$os = Get-OSVersion
+
 Describe "Node.js" {
     BeforeAll {
         $os = Get-OSVersion
@@ -48,3 +50,15 @@ Describe "nvm" {
         }
     }
 }
+
+Describe "AppCenterCLI" {
+    It "App Center CLI" {
+        "appcenter --version" | Should -ReturnZeroExitCode
+    }
+}
+
+Describe "Newman" -Skip:($os.IsHighSierra -or $os.IsMojave) {
+    It "Newman" {
+        "newman --version" | Should -ReturnZeroExitCode
+    }
+}