Adding test coverage for Variable provider

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

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+Describe "Validate basic Variable provider cmdlets" -Tags "CI" {
+    BeforeAll {
+        $testVarName = "MyTestVarThatWontConflict"
+        $testVarValue = 1234
+        $testVarDescription = "This is a test variable for provider test purposes."
+    }
+
+    BeforeEach {
+        New-Variable -Name $testVarName -Value $testVarValue -Description $testVarDescription
+    }
+
+    AfterEach {
+        Remove-Variable -Name $testVarName -ErrorAction SilentlyContinue
+    }
+
+    It "Verify Get-Item" {
+        $result = Get-Item "Variable:${testVarName}"
+        $result.Name | Should Be $testVarName
+        $result.Value | Should Be $testVarValue
+    }
+
+    It "Verify New-Item" {
+        $result = New-Item -Name "MyTestVariable" -Value 5 -Path "Variable:"
+        $result.Name | Should Be "MyTestVariable"
+        $result.Value | Should Be 5
+    }
+
+    It "Verify Clear-Item" {
+        $valueBefore = (Get-Item "Variable:${testVarName}").Value
+        Clear-Item "Variable:${testVarName}"
+        $valueAfter = (Get-Item "Variable:${testVarName}").Value
+        $valueBefore | Should Be $testVarValue
+        $valueAfter | Should BeNullOrEmpty
+    }
+
+    It "Verify Copy-Item" {
+        Copy-Item -Path "Variable:${testVarName}" -Destination "Variable:${testVarName}_Copy"
+        $original = Get-Item "Variable:${testVarName}"
+        $copy = Get-Item "Variable:${testVarName}_Copy"
+        $original.Name | Should Be $testVarName
+        $copy.Name | Should Be "${testVarName}_Copy"
+        $original.Value | Should Be $copy.Value
+    }
+
+    It "Verify Remove-Item" {
+        $existsBefore = Test-Path "Variable:${testVarName}"
+        Remove-Item -Path "Variable:${testVarName}"
+        $existsAfter = Test-Path "Variable:${testVarName}"
+        $existsBefore | Should Be $true
+        $existsAfter | Should Be $false
+    }
+
+    It "Verify Rename-Item" {
+        $existsBefore = Test-Path "Variable:${testVarName}"
+        Rename-Item -Path "Variable:${testVarName}" -NewName "${testVarName}_Rename"
+        $existsAfter = Test-Path "Variable:${testVarName}"
+        $result = Get-Item "Variable:${testVarName}_Rename"
+        $existsBefore | Should Be $true
+        $existsAfter | Should Be $false
+        $result.Name | Should Be "${testVarName}_Rename"
+        $result.Value | Should Be $testVarValue
+    }
+}
+
+Describe "Validate basic negative test cases for Variable provider cmdlets" -Tags "Feature" {
+    BeforeAll {
+        $testVarName = "MyTestVarThatWontConflict"
+        $testVarValue = 1234
+        $testVarDescription = "This is a test variable for provider test purposes."
+    }
+
+    BeforeEach {
+        New-Variable -Name $testVarName -Value $testVarValue -Description $testVarDescription
+    }
+
+    AfterEach {
+        Remove-Variable -Name $testVarName -ErrorAction SilentlyContinue
+    }
+
+    It "Verify Negative New-Item" {
+        try {
+            New-Item -Name $testVarName -Value 5 -Path "Variable:" -ErrorAction Stop 
+            throw "Expected exception not thrown"
+        }
+        catch { $_.FullyQualifiedErrorId | Should be "Argument,Microsoft.PowerShell.Commands.NewItemCommand" }
+    }
+
+    It "Verify Negative Move-Item" {
+        $alreadyExistsVar = 2
+        try {
+            Move-Item -Path "Variable:${testVarName}" -Destination "Variable:alreadyExistsVar" -ErrorAction Stop 
+            throw "Expected exception not thrown"
+        } 
+        catch { $_.FullyQualifiedErrorId | Should be "GetDynamicParametersException,Microsoft.PowerShell.Commands.MoveItemCommand" }
+    }
+
+    It "Verify Negative Invoke-Item" {
+        try {
+            Invoke-Item -Path "Variable:${testVarName}" -ErrorAction Stop 
+            throw "Expected exception not thrown"
+        }
+        catch { $_.FullyQualifiedErrorId | Should be "NotSupported,Microsoft.PowerShell.Commands.InvokeItemCommand" }
+    }
+
+    It "Verify Negative Get-ItemPropertyValue" {
+        try {
+            Get-ItemPropertyValue -Path "Variable:" -Name $testVarName -ErrorAction Stop 
+            throw "Expected exception not thrown"
+        }
+        catch { $_.FullyQualifiedErrorId | Should be "NotSupported,Microsoft.PowerShell.Commands.GetItemPropertyValueCommand" }
+    }
+}
+
+Describe "Validate special variables" -Tags "CI" {
+    It "Verify `$PSVersionTable.PSEdition" {
+        $PSVersionTable["PSEdition"] | Should Be "Core"
+    }
+}