Adding test coverage for Alias provider

test/powershell/Modules/Microsoft.PowerShell.Management/Alias.Tests.ps1

@@ -0,0 +1,55 @@
+Describe "Basic Validation of Alias Provider" -Tags "CI" {
+    BeforeAll {
+        $testAliasName = 'TestAlias'
+        $testAliasValue = 'Get-Date'
+    }
+
+    BeforeEach {
+        New-Item -Path Alias:\ -Name $testAliasName -Value $testAliasValue > $null
+    }
+
+    AfterEach {
+        Remove-Item -Path "Alias:\${testAliasName}" -ErrorAction SilentlyContinue
+    }
+    
+    It "Test number of alias not Zero" {
+        $aliases = Get-ChildItem Alias:\
+        $aliases.Count | Should Not Be 0
+    }
+
+    It "Test alias 'dir'" {
+        $dirAlias = Get-Item Alias:\dir
+        $dirAlias.CommandType | Should Be 'Alias'
+        $dirAlias.Name | Should Be 'dir'
+        $dirAlias.Definition | Should Be 'Get-ChildItem'
+    }
+
+    It "Test creating new alias" {
+        $newAlias = New-Item -Path Alias:\ -Name 'NewTestAlias' -Value $testAliasValue
+        try {
+            $newAlias.CommandType | Should Be 'Alias'
+            $newAlias.Name | Should Be 'NewTestAlias'
+            $newAlias.Definition | Should Be $testAliasValue
+        }
+        finally {
+            Remove-Item -Path 'Alias:\NewTestAlias' -ErrorAction SilentlyContinue
+        }
+    }
+
+    It "Test get-item on alias provider" {
+        $alias = Get-Item -Path "Alias:\${testAliasName}"
+        $alias.CommandType | Should Be 'Alias'
+        $alias.Name | Should Be $testAliasName
+        $alias.Definition | Should Be $testAliasValue
+    }
+
+    It "Test test-path on alias provider" {
+        $aliasExists = Test-Path Alias:\testAlias
+        $aliasExists | Should Be $true
+    }
+
+    It "Test executing the new alias" {
+        $result = testAlias
+        $result.GetType().Name | Should Be 'DateTime'
+    }
+}