[Ubuntu] Migrate tests for Android to Pester (#2313)

* Add Pester tests for Android on Ubuntu

* Minor fix

* Move Get-AndroidPackages to common helpers

* Minor fix

* Delete Android test name for invoke_tests script

images/linux/scripts/tests/Android.Tests.ps1

@@ -0,0 +1,50 @@
+Describe "Android" {
+    $androidSdkManagerPackages = Get-AndroidPackages
+    [int]$platformMinVersion = Get-ToolsetValue "android.platform_min_version"
+    [version]$buildToolsMinVersion = Get-ToolsetValue "android.build_tools_min_version"
+
+    $platforms = (($androidSdkManagerPackages | Where-Object { "$_".StartsWith("platforms;") }) -replace 'platforms;', '' |
+    Where-Object { [int]$_.Split("-")[1] -ge $platformMinVersion } | Sort-Object { [int]$_.Split("-")[1] } -Unique |
+    ForEach-Object { "platforms/${_}" })
+
+    $buildTools = (($androidSdkManagerPackages | Where-Object { "$_".StartsWith("build-tools;") }) -replace 'build-tools;', '' |
+    Where-Object { [version]$_ -ge $buildToolsMinVersion } | Sort-Object { [version]$_ } -Unique |
+    ForEach-Object { "build-tools/${_}" })
+
+    $androidPackages = @(
+        $platforms,
+        $buildTools,
+        (Get-ToolsetValue "android.extra_list" | ForEach-Object { "extras/${_}" }),
+        (Get-ToolsetValue "android.addon_list" | ForEach-Object { "add-ons/${_}" }),
+        (Get-ToolsetValue "android.additional_tools" | ForEach-Object { "${_}" })
+    ) | ForEach-Object { $_ }
+
+    BeforeAll {
+        $ANDROID_SDK_DIR = "/usr/local/lib/android/sdk"
+
+        function Validate-AndroidPackage {
+            param (
+                [Parameter(Mandatory=$true)]
+                [string]$PackageName
+            )
+
+            # Convert 'm2repository;com;android;support;constraint;constraint-layout-solver;1.0.0-beta1' ->
+            #         'm2repository/com/android/support/constraint/constraint-layout-solver/1.0.0-beta1'
+            #         'cmake;3.6.4111459' -> 'cmake/3.6.4111459'
+            #         'patcher;v4' -> 'patcher/v4'
+            $PackageName = $PackageName.Replace(";", "/")
+            $targetPath = Join-Path $ANDROID_SDK_DIR $PackageName
+            $targetPath | Should -Exist
+        }
+    }
+
+
+    Context "Packages" {
+        $testCases = $androidPackages | ForEach-Object { @{ PackageName = $_ } }
+
+        It "<PackageName>" -TestCases $testCases {
+            param ([string] $PackageName)
+            Validate-AndroidPackage $PackageName
+        }
+    }
+}