Mastering Windows PowerShell Scripting - Third Edition

Assert-MockCalled

Pester tracks calls made to mocked commands. The number of times a Mock has been called by a command can be tested by using the Assert-MockCalled command. The following function makes a single call to Get-CimInstance:

function Get-OperatingSystemName { 
    (Get-CimInstance Win32_OperatingSystem).Caption 
} 

If a Mock of Get-CimInstance is created, the number of times that the command is called can be tested. In this example, the test asserts that Get-CimInstance is called at least once:

Describe Get-OperatingSystemName {    BeforeAll {
        Mock Get-CimInstance { 
            [PSCustomObject]@{ 
                Caption = 'OSName' 
            } 
        }     }    It 'Gets the name of the operating system' { 
        Get-OperatingSystemName | Should -Be 'OSName' Assert-MockCalled Get-CimInstance } } ...