Pester 模拟 CmdLets

发布于 2025-01-09 23:05:51 字数 739 浏览 5 评论 0原文

我对 Pester 中的模拟机制有疑问。我有一个想要测试的脚本 Script.ps1 。这些测试位于 Script.Tests.ps1 中。在 Script.ps1 中，我实现了以下函数：

function Start-Executable {
    param([string]$Executable)

    Start-Process $Executable
}

出于测试目的，我想模拟 Start-Process。 Script.Tests.ps1 包含以下测试。

BeforeAll{
   . $PSScriptRoot/Script.ps1
}

Describe 'Start-Executable' {
    Mock -CommandName 'Start-Process' -MockWith {return $null}
    
    It 'Start-Process is called.'{

       Start-Executable -Executable 'Test.exe'
       Assert-MockCalled 'Start-Process'
    }
}

如果我执行测试，真正的 Start-Process 会抛出找不到“Test.exe”的异常。如果我将模拟移动到 It 块中，测试就会通过。我想在描述块中添加模拟（或者稍后，随着更多测试的编写，在上下文块中），让一个模拟覆盖一系列测试。这可能吗？我做错了什么？

原文

I have question regarding to the mocking mechanism in Pester. I have a script Script.ps1 that I want to test. The tests are located in Script.Tests.ps1. In Script.ps1 I implemented the following function:

function Start-Executable {
    param([string]$Executable)

    Start-Process $Executable
}

For testing purpose I want to mock Start-Process. The Script.Tests.ps1 contains the following test.

BeforeAll{
   . $PSScriptRoot/Script.ps1
}

Describe 'Start-Executable' {
    Mock -CommandName 'Start-Process' -MockWith {return $null}
    
    It 'Start-Process is called.'{

       Start-Executable -Executable 'Test.exe'
       Assert-MockCalled 'Start-Process'
    }
}

If I execute the test, the real Start-Process throws an exception that 'Test.exe' could not be found. If I move the mock in the It-block, the test passes. I would like to add the mock in the Describe-block (or later, as more tests are getting written, in the Context-block) to have one mock covering a bench of tests. Is this possible and what I am doing wrong?

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浅唱ヾ落雨殇 2025-01-16 23:05:51

看起来您可能正在使用 Pester v5。因此，您的模拟需要位于 BeforeAll 或 BeforeEach 块中。

这应该有效：

BeforeAll{
   . $PSScriptRoot/Script.ps1
}

Describe 'Start-Executable' {
    BeforeAll {
        Mock -CommandName 'Start-Process' -MockWith {return $null}
    }

    It 'Start-Process is called.'{

       Start-Executable -Executable 'Test.exe'
       Assert-MockCalled 'Start-Process'
    }
}

所有代码都放置在It、BeforeAll之外的Describe主体中，
BeforeEach、AfterAll、AfterEach 将在发现期间运行，它是
状态可能对测试代码可用，也可能不可用，请参阅 Discovery
并运行
-- https://pester-docs.netlify .app/docs/migrations/writing-changes-in-v5

It looks like you're probably using Pester v5. As such your mock needs to be in a BeforeAll or BeforeEach block.

This should work:

BeforeAll{
   . $PSScriptRoot/Script.ps1
}

Describe 'Start-Executable' {
    BeforeAll {
        Mock -CommandName 'Start-Process' -MockWith {return $null}
    }

    It 'Start-Process is called.'{

       Start-Executable -Executable 'Test.exe'
       Assert-MockCalled 'Start-Process'
    }
}

All code placed in the body of Describe outside of It, BeforeAll,
BeforeEach, AfterAll, AfterEach will run during discovery and it's
state might or might not be available to the test code, see Discovery
and Run
-- https://pester-docs.netlify.app/docs/migrations/breaking-changes-in-v5

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