powershell - Pester 5.0.2 BeforeAll block 代码未显示在 Describe block 中

Question

我最近切换到 Pester 5.0.2，开始对我编写的 Powershell 脚本进行一些测试。我能够进入 BeforeAll block 并且路径正在按照我的预期填充，但是当我到达我的 Describe block 中的 Get-ChildItem 区域时，BeforeAll 中的变量为 $null。

BeforeAll {
    $testDir = Split-Path $PSCommandPath -Parent
    $prodDir = Split-Path $testDir -Parent
}
Describe "Tests - All Files in prod" {
    Get-ChildItem $prodDir -File | ForEach-Object {
        $fileName = (Split-Path $_ -leaf).PadRight(20, ' ')
        $filePath = $_.PSPath
        It "Vars not declared or changed between function definitions" {
            [System.Collections.ArrayList]$preSource = (Get-Variable).Name
            . "$filePath" -Sourcing
            [System.Collections.ArrayList]$postSource = (Get-Variable).Name
            $postSource.Remove('preSource')
            $postSource.Remove('UnderTest')
            [array]$diff = Compare-Object $preSource $postSource -PassThru
            $diff | Should -BeNullOrEmpty
        }
        It "$fileName all #*, #?, #TODO tags are removed" {
            $_ | Should -Not -FileContentMatch $([regex]::escape('#TODO'))
            $_ | Should -Not -FileContentMatch $([regex]::escape('#*'))
            $_ | Should -Not -FileContentMatch $([regex]::escape('#?'))
        }
    }
}

Answer 1

我找到了答案，但在文档中很难找到。由于新的“发现”功能，这不再有效。这在所有 Describe、It、Context、BeforeAll、AfterAll 等 block 之前运行。然后丢弃此处运行的代码。

我最终使用了使用 -TestCase 参数的测试用例来解决问题。

编辑:

下面的版本带有关于为什么它不起作用的评论，然后是如何设置它的示例。

BeforeAll {
    # This block will run AFTER discovery. Anything you need to be evaluated in front of the tests should
    # be placed here
    $testDir = Split-Path $PSCommandPath -Parent
    $prodDir = Split-Path $testDir -Parent
}
$iWillDisappearAfterDiscovery = 'Byebye'
Describe "Describing your tests" {
    # Code placed here will be run DURING discovery, and will not be availble at runtime. Placing the code from
    # BeforeAll here instead would not work as $testDir and $prodDir would be empty when the tests ran. 
    #
    # The apparent exception to this rule is that the tests are done DURING discovery and then stashed for when
    # the tests run. That means your test cases can be set up here if not done directly inside the -TestCases parameter
    #
    Get-ChildItem $prodDir -File | ForEach-Object {
        $fileName = (Split-Path $_ -leaf).PadRight(20, ' ')
        $filePath = $_.PSPath
        It "Vars not declared or changed between function definitions" {
            [System.Collections.ArrayList]$preSource = (Get-Variable).Name
            . "$filePath" -Sourcing
            [System.Collections.ArrayList]$postSource = (Get-Variable).Name
            $postSource.Remove('preSource')
            $postSource.Remove('UnderTest')
            [array]$diff = Compare-Object $preSource $postSource -PassThru
            $diff | Should -BeNullOrEmpty
        }
        It "$fileName all #*, #?, #TODO tags are removed" {
            $_ | Should -Not -FileContentMatch $([regex]::escape('#TODO'))
            $_ | Should -Not -FileContentMatch $([regex]::escape('#*'))
            $_ | Should -Not -FileContentMatch $([regex]::escape('#?'))
        }
    }
}

# Here's a correct example:

BeforeAll {
    $testDir = Split-Path $PSCommandPath -Parent
    $prodDir = Split-Path $testDir -Parent
}
Describe "Describing your tests" {
    # You can still set them up dynamically as test cases
    [System.Collections.ArrayList]$testCases = @()
    Get-ChildItem $prodDir -File | ForEach-Object {
        $fileName = (Split-Path $_ -leaf).PadRight(20, ' ')
        $filePath = $_.PSPath
        $testCases.Add({fileName = $fileName; filePath = $filePath})
    }
    It "<fileName> Exists" -TestCases $testCases { 
        #using <varName> will dynamically name your tests with data
        # from your test cases
        $filePath | Should -Exist
    }
    It "<fileName> all #*, #?, #TODO tags are removed" {
        $filePath | Should -Not -FileContentMatch $([regex]::escape('#TODO'))
        $filePath | Should -Not -FileContentMatch $([regex]::escape('#*'))
        $filePath | Should -Not -FileContentMatch $([regex]::escape('#?'))
    }
    Context "Different Context, Run different tests" {
        $testCases = @{filename = 'file4'.PadRight(20, ' '); filepath = '/path/to/file4.ps1' },
        @{filename = 'file5'.PadRight(20, ' '); filepath = '/path/to/file5.ps1' }
        It "Exists" {
            $filePath | Should -Exist
        }
    }
    Context "You can also set them up inline like this" -TestCases @(
        $testCases = @{filename = 'file1'.PadRight(20, ' '); filepath = '/path/to/file1.ps1' },
        @{filename = 'file2'.PadRight(20, ' '); filepath = '/path/to/file2.ps1' },
        @{filename = 'file3'.PadRight(20, ' '); filepath = '/path/to/file3.ps1' }
    ) {
        It "Run some tests" {
            $fileName | Should -BeOfType [string]
        }
    }

}