adds Test-Module pester tests

tests/Helper/01_Test-Module.Tests.ps1

@@ -0,0 +1,43 @@
+#region HEADER
+$RepoRoot = (Get-GitDirectory).replace('\.git', '')
+$sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path) -replace '\.Tests\.', '.'
+$sut = $sut -replace "\d{2}`_", ''
+$suthome = (Get-ChildItem -Path $RepoRoot -Exclude ".\tests\" -Filter $sut -Recurse).FullName
+# Skip try loading the source file if it doesn't exists.
+If ($suthome.Length -gt 0) {
+    . $suthome
+}
+Else {
+    Write-Warning ("Could not find source file {0}" -f $sut)
+}
+
+# load additional functions defined in the repository. Replace the expression <FunctionName>.
+#. (Get-ChildItem -Path $RepoRoot -Filter "<FunctionName>.ps1" -Recurse).FullName
+
+#endregion HEADER
+
+Describe "Test-ModuleName" {
+    Context "Basic input tests" {
+        It "Testing standard module should not throw" {
+            { Test-Module -Name 'PowerShellGet' -Type Module } | Should -Not -Throw
+        }
+        It "Existing module should return true" {
+            Test-Module -Name 'PowerShellGet' -Type Module | Should -Be $true
+        }
+    }
+    Context "Custom Type tests" {
+        It "Using custom type should throw" {
+            { Test-Module -Name "foobarr" -Type Custom} | Should -Throw
+        }
+    }
+    Context "Working with PSSnapins" {
+        It "Loading first PSSnaping should not throw " {
+            $Snap = Get-PSSnapin -Registered | Select-Object -First 1
+            { $loaded = Test-Module -Name $Snap.Name -Type PSSnapin } | Should -Not -Throw
+            Remove-PSSnapin -Name $Snap.Name
+        }
+        It "Loading first PSSnaping should return true" {
+            $loaded | Should -Be $true
+        }
+    }
+}