Replace current validates with pester testing approach #3 (#1230)

* Pester Tests Approach implementation.

* changes for netPath

images/win/scripts/Tests/Miniconda.Tests.ps1

@@ -0,0 +1,14 @@
+Describe "Miniconda" {
+    It "Miniconda Environment variables is set. " {
+        ${env:CONDA} | Should -Not -BeNullOrEmpty
+    }
+    
+    It "Miniconda $env:CONDA\<PathTest> " -TestCases @(
+        @{ PathTest = "python.exe" }
+        @{ PathTest = "Scripts\conda.exe" }
+    ) {
+        $condaPath = Join-Path ${env:CONDA} $PathTest
+        $condaPath | Should -Exist
+        "$condaPath --version" | Should -ReturnZeroExitCode
+    }
+}