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# Licensed under the MIT License.
Describe "Clear-Variable DRT Unit Tests" -Tags "CI" {
It "Clear-Variable normal variable Name should works"{
Set-Variable foo bar
Clear-Variable -Name foo
$var1=Get-Variable -Name foo
$var1.Name | Should -BeExactly "foo"
$var1.Value | Should -BeNullOrEmpty
$var1.Options | Should -BeExactly "None"
$var1.Description | Should -BeNullOrEmpty
}
It "Clear-Variable ReadOnly variable Name should throw exception and force Clear-Variable should works"{
Set-Variable foo bar -Option ReadOnly
$e = { Clear-Variable -Name foo -Scope 1 -ErrorAction Stop } | Should -Throw -ErrorId "VariableNotWritable,Microsoft.PowerShell.Commands.ClearVariableCommand" -PassThru
$e.CategoryInfo | Should -Match "SessionStateUnauthorizedAccessException"
Clear-Variable -Name foo -Force
$var1=Get-Variable -Name foo
$var1.Name | Should -BeExactly "foo"
$var1.Value | Should -BeNullOrEmpty
$var1.Options | Should -BeExactly "ReadOnly"
$var1.Description | Should -BeNullOrEmpty
}
It "Clear-Variable normal variable Name with local scope should works"{
Set-Variable foo bar
&{
Set-Variable foo baz
$foo | Should -Be baz
Clear-Variable -Name foo -Scope "local"
$var1=Get-Variable -Name foo -Scope "local"
$var1.Name | Should -BeExactly "foo"
$var1.Value | Should -BeNullOrEmpty
$var1.Options | Should -BeExactly "None"
$var1.Description | Should -BeNullOrEmpty
}
$var1=Get-Variable -Name foo
$var1.Name | Should -BeExactly "foo"
$var1.Value | Should -BeExactly "bar"
$var1.Options | Should -BeExactly "None"
$var1.Description | Should -BeNullOrEmpty
}
It "Clear-Variable Private variable Name should works and Get-Variable with local scope should throw exception"{
Set-Variable foo bar -Option Private
&{
$e = { Get-Variable -Name foo -Scope local -ErrorAction Stop } |
Should -Throw -ErrorId "VariableNotFound,Microsoft.PowerShell.Commands.GetVariableCommand" -PassThru
$e.CategoryInfo | Should -Match "ItemNotFoundException"
}
$var1=Get-Variable -Name foo
$var1.Name | Should -BeExactly "foo"
$var1.Value | Should -BeExactly "bar"
$var1.Options | Should -BeExactly "Private"
$var1.Description | Should -BeNullOrEmpty
}
It "Clear-Variable normal variable Name with local scope should works in different scope"{
Set-Variable foo bar
&{
Set-Variable foo baz
Clear-Variable -Name foo -Scope "local"
$var1=Get-Variable -Name foo -Scope "local"
$var1.Name | Should -BeExactly "foo"
$var1.Value | Should -BeNullOrEmpty
$var1.Options | Should -BeExactly "None"
$var1.Description | Should -BeNullOrEmpty
}
$var1=Get-Variable -Name foo
$var1.Name | Should -BeExactly "foo"
$var1.Value | Should -BeExactly "bar"
$var1.Options | Should -BeExactly "None"
$var1.Description | Should -BeNullOrEmpty
$var1=Get-Variable -Name foo -Scope "local"
$var1.Name | Should -BeExactly "foo"
$var1.Value | Should -BeExactly "bar"
$var1.Options | Should -BeExactly "None"
$var1.Description | Should -BeNullOrEmpty
}
}
Describe "Clear-Variable" -Tags "CI" {
BeforeEach {
$var1 = 3
}
It "Should be able to clear a variable using the Name switch" {
Clear-Variable -Name var1
$var1 | Should -BeNullOrEmpty
{ Get-Variable var1 } | Should -Not -Throw
}
It "Should be able to clear a variable without using the Name switch" {
Clear-Variable var1
$var1 | Should -BeNullOrEmpty
{ Get-Variable var1 } | Should -Not -Throw
}
It "Should be able to include a set of variables to clear" {
$var1 = 2
$var2 = 3
$var3 = 4
$variable1 = 23
$variable2 = 4
$variable3 = 2
$w = 3
Clear-Variable -Name w, vari* -Include w, vari*
$variable1 | Should -BeNullOrEmpty
$variable2 | Should -BeNullOrEmpty
$variable3 | Should -BeNullOrEmpty
$w | Should -BeNullOrEmpty
$var1 | Should -Not -BeNullOrEmpty
$var2 | Should -Not -BeNullOrEmpty
$var3 | Should -Not -BeNullOrEmpty
}
It "Should be able to exclude a set of variables to clear" {
$var1 = 2
$var2 = 3
$var3 = 4
$variable1 = 23
$variable2 = 4
$variable3 = 2
$w = 3
Clear-Variable -Name w, vari* -Exclude var*
$variable1 | Should -Not -BeNullOrEmpty
$variable2 | Should -Not -BeNullOrEmpty
$variable3 | Should -Not -BeNullOrEmpty
$var1 | Should -Not -BeNullOrEmpty
$var2 | Should -Not -BeNullOrEmpty
$var3 | Should -Not -BeNullOrEmpty
$w | Should -BeNullOrEmpty
}
It "Should be able to pass the cleared object through the pipeline using the passthru switch" {
{ Clear-Variable -Name var1 -PassThru | Format-Wide -Property Value } | Should -Not -Throw
}
It "Should not clear environment variables" {
$env:TEMPVARIABLE = "test data"
{ Clear-Variable -Name env:TEMPVARIABLE -ErrorAction Stop } | Should -Throw
}
It "Should clear variable even if it is read-only using the Force parameter" {
try
{
New-Variable -Name var2 -Option ReadOnly -Value 100
Clear-Variable -Name var1
Clear-Variable -Name var2 -Force
$var1 | Should -BeNullOrEmpty
$var2 | Should -BeNullOrEmpty
}
finally
{
Remove-Variable -Name var2 -Force
}
}
It "Should throw error when trying to clear variable that is read-only without using the Force parameter" {
New-Variable -Name var2 -Option ReadOnly -Value 100
{ Clear-Variable -Name var2 -Scope 1 -ErrorAction stop } | Should -Throw -ErrorId "VariableNotWritable,Microsoft.PowerShell.Commands.ClearVariableCommand"
$var2 | Should -Not -BeNullOrEmpty
Remove-Variable -Name var2 -Force
}
Context "Scope Tests" {
# This will violate the DRY principle. Tread softly.
It "Should be able to clear a global scope variable using the global switch" {
New-Variable globalVar -Value 1 -Scope global -Force
Clear-Variable -Name globalVar -Scope global
$globalVar | Should -BeNullOrEmpty
}
It "Should not be able to clear a global scope variable using the local switch" {
New-Variable globalVar -Value 1 -Scope global -Force
{ Clear-Variable -Name globalVar -Scope local -ErrorAction Stop } |
Should -Throw -ErrorId "VariableNotFound,Microsoft.PowerShell.Commands.ClearVariableCommand"
}
It "Should not be able to clear a global variable using the script scope switch" {
New-Variable globalVar -Value 1 -Scope global -Force
{ Clear-Variable -Name localVar -Scope script -ErrorAction Stop } | Should -Throw -ErrorId "VariableNotFound,Microsoft.PowerShell.Commands.ClearVariableCommand"
}
It "Should be able to clear an item locally using the local switch" {
New-Variable localVar -Value 2 -Scope local -Force
Clear-Variable -Name localVar -Scope local
$localVar | Should -BeNullOrEmpty
{ Clear-Variable -Name localVar -Scope script -ErrorAction Stop } | Should -Throw -ErrorId "VariableNotFound,Microsoft.PowerShell.Commands.ClearVariableCommand"
}
It "Should not be able to clear an item locally using the global switch" {
New-Variable localVar -Value 2 -Scope local -Force
{ Clear-Variable -Name localVar -Scope global -ErrorAction Stop } | Should -Throw -ErrorId "VariableNotFound,Microsoft.PowerShell.Commands.ClearVariableCommand"
}
It "Should not be able to clear a local variable using the script scope switch" {
New-Variable localVar -Value 2 -Scope local -Force
{ Clear-Variable -Name localVar -Scope script -ErrorAction Stop } | Should -Throw -ErrorId "VariableNotFound,Microsoft.PowerShell.Commands.ClearVariableCommand"
}
It "Should be able to clear a script variable created using the script switch" {
{
New-Variable -Name derp2 -Value 3 -Scope script -Force
Clear-Variable -Name derp2 -Scope script
} | Should -Not -Throw
}
It "Should be able to clear a global script variable that was created using the script scope switch" {
{
New-Variable -Name derpx -Value 4 -Scope script -Force
Clear-Variable -Name derpx -Scope script
} | Should -Not -Throw
}
}
}
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