Functions/Set-DefaultValue.Tests.ps1
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describe "BitTitan.Runbooks.Common/Set-DefaultValue" -Tag "module", "unit" { # Import the function to test . "$($PSScriptRoot)\Set-DefaultValue.ps1" it "sets the variable to the default value when given a variable containing null" { $Global:variable = $null $variable | Set-DefaultValue 42 $variable | Should Be 42 $Global:variable = $null $variable | Set-DefaultValue "string" $variable | Should Be "string" $Global:variable = $null $variable | Set-DefaultValue $true $variable | Should Be $true $Global:variable = $null $variable | Set-DefaultValue @(1, 2, 3) $variable | Should Be @(1, 2, 3) } it "does not change the value of the variable when given a variable already containing a value" { $Global:variable = 5 $variable | Set-DefaultValue 42 $variable | Should Be 5 $Global:variable = "foo" $variable | Set-DefaultValue "bar" $variable | Should Be "foo" $Global:variable = $false $variable | Set-DefaultValue $true $variable | Should Be $false $Global:variable = @(1, 2) $variable | Set-DefaultValue @(1, 2, 3) $variable | Should Be @(1, 2) } it "throws an exception when the variable is not passed through the pipeline" { $Global:variable = $null try { Set-DefaultValue 42 $variable # Throw an exception - this statement should not be executed $true | Should Be $false } catch { $_.Exception.Message | Should BeLike "Set-DefaultValue should be given the variable through the pipeline*" } $variable | Should Be $null } it "removes the script variable and sets the default for the global variable when given a script variable containing null" { $Global:variable = 5 $Script:variable = $null $variable | Set-DefaultValue 42 $Script:Variable | Should Be $null $Global:Variable | Should Be 42 } it "does not change the value of the global or script variable when given a script variable already containing a value" { $Global:variable = 5 $Script:variable = 10 $variable | Set-DefaultValue 42 $Global:variable | Should Be 5 $Script:variable | Should Be 10 } } |