[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/System.Tests.ps1

@@ -0,0 +1,38 @@
+$os = Get-OSVersion
+
+Describe "Disk free space" {
+    It "Image has more than 10GB free space" {
+        # we should have at least 10 GB of free space on macOS images
+        # https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops#capabilities-and-limitations
+        $freeSpace = (Get-PSDrive "/").Free
+        $freeSpace | Should -BeGreaterOrEqual 10GB
+    }
+}
+
+Describe "Certificate" {
+    It "Apple Worldwide Developer Relations Certification Authority[expired: 2030-02] is installed" {
+        $sha1Hash = "06EC06599F4ED0027CC58956B4D3AC1255114F35"
+        $certs = security find-certificate -a -c Worldwide -p -Z | Out-String
+        $certs | Should -Match $sha1Hash
+    }
+}
+
+Describe "Audio device" -Skip:($os.IsHighSierra -or $os.IsBigSur) {
+    It "Sox is installed" {
+        "sox --version" | Should -ReturnZeroExitCode
+    }
+
+    It "SwitchAudioSource is installed" {
+        "SwitchAudioSource -c" | Should -ReturnZeroExitCode
+    }
+
+    It "Audio channel Soundflower (2ch)" {
+        SwitchAudioSource -c | Should -BeLikeExactly "Soundflower (2ch)"
+    }
+}
+
+Describe "Screen Resolution" -Skip:($os.IsHighSierra) {
+    It "Screen Resolution" {
+        system_profiler SPDisplaysDataType | Select-String "Resolution" | Should -Match "1176 x 885"
+    }
+}