如何在Pester中模拟带有必需参数的Powershell函数

Question

这是我的代码： Testcase.ps1

function Verify_AuthenticodeSignature{
Param(
   [Parameter(Mandatory=$true)]
   [string]$PSFilePath
)
    Write-Host $PSFilePath
    if (-Not (Test-Path $PSFilePath)){
        echo "file does not exist"
        exit 1
    }

    $Status=(Get-AuthenticodeSignature -FilePath $PSFilePath).Status
    if($Status -ne "Valid"){
        echo "Script is not signed"
    } 
}
Verify_AuthenticodeSignature

Testcase.Tests.ps1：

$here = Split-Path -Parent $MyInvocation.MyCommand.Path
$sut = (Split-Path -Leaf $MyInvocation.MyCommand.Path) -replace '\.Tests\.', '.'
. "$here\$sut"

Describe "Testing" {

    It "Test Path"{
       Mock Test-Path{$false}
       Mock echo{}

       Verify_AuthenticodeSignature

       Assert-MockCalled echo -Times 1
       #Verify_AuthenticodeSignature -PSFilePath 'D:\abc\xyz.ps1' |should be "file does not exist"
    }       



    It "Authentication"{
        Mock Get-AuthenticodeSignature{ return "valid" }
        Mock echo{}

        Verify_AuthenticodeSignature

        Assert-MockCalled Get-AuthenticodeSignature -Times 1
        Assert-MockCalled echo -Times 1
    }

    }

在这里，我想模拟具有强制性参数的powershell函数，而不向用户询问$ PSFilePath变量值，而是使用任何虚拟值来检查模拟函数。 每当我运行Testcase.Tests.ps1它提示$ PSFilePath值和运行源PowerShell脚本（Testcase.ps1）我坚持这一点，任何建议将是很大的帮助。

Answer 1

在TestDrive:创建一个临时文件TestDrive:

Describe 'Describing test' {

    it 'dummy test fail' {
         Test-Path TestDrive:\Test.log | Should Be $True 
    }

    it 'dummy test pass' {
        'some file' | Out-File TestDrive:\Test.log
         Test-Path TestDrive:\Test.log | Should Be $True 
    }
}