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这是关于 Pester 中测试数据的范围。我正在测试一个函数Add-HashTableIfNotPresent，它检查哈希表中是否存在一个键，如果它不存在，则添加它，否则它返回链接到该键的值。

我有 2It个块用于我的纠缠测试，用于检查 2 个场景 - 密钥存在和密钥不存在。我期待$ht为每个It块重新创建，但如果我交换我的 2 Its的顺序则不是这样，Returns existing entry when passed existing key因为$ht.count仍然是 3。

有没有办法$ht为每个测试重置或者我需要在It块内定义它？

被测功能：

function Add-HashTableIfNotPresent {
    [CmdletBinding()]
    param(
        [hashtable] $sourceTable,
        [string] $keyToCheck
    )

    $subTable = $sourceTable.$keyToCheck
    if(-not $subTable){
        $subTable = @{}
        $sourceTable.$keyToCheck = $subTable
    }
}

测试代码：

Describe 'Add-HashTableIfNotPresent' {
    $ht = @{
        subTable1 = @{
            st1 = "abc"
        }
        subTable2 = @{
            st2 = "def"
        }
    }

    It "Returns existing entry when passed existing key" {
        Add-HashTableIfNotPresent -sourceTable $ht -keyToCheck subTable2
        $ht.Count | Should BeExactly 2
        $value = $ht.subTable2
        $value.count | Should BeExactly 1
        $value.st2 | Should -Be "def"
    }

    It "Adds entry that doesn't exist" {
        Add-HashTableIfNotPresent -sourceTable $ht -keyToCheck subTable3
        $ht.Count | Should BeExactly 3
        $addedValue = $ht.subTable3
        $addedValue | Should -Be $true
        $addedValue.count | Should BeExactly 0
    }
}
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1 回答 1

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Context和Describe块具有范围，这意味着其中定义的变量仅限于该特定块并且不存在于该特定块之外，但您的变量仍然不会为每个It测试自动重置。

我建议在每次测试之前使用函数来设置您的哈希表：

Function Set-TestHashTable {
    @{
        subTable1 = @{
            st1 = "abc"
        }
        subTable2 = @{
            st2 = "def"
        }
    }
}

Describe 'Add-HashTableIfNotPresent' {

    $ht = Set-TestHashTable

    It "Returns existing entry when passed existing key" {
        Add-HashTableIfNotPresent -sourceTable $ht -keyToCheck subTable2
        $ht.Count | Should BeExactly 2
        $value = $ht.subTable2
        $value.count | Should BeExactly 1
        $value.st2 | Should -Be "def"
    }

    $ht = Set-TestHashTable

    It "Adds entry that doesn't exist" {
        Add-HashTableIfNotPresent -sourceTable $ht -keyToCheck subTable3
        $ht.Count | Should BeExactly 3
        $addedValue = $ht.subTable3
        $addedValue | Should -Be $true
        $addedValue.count | Should BeExactly 0
    }
}
于 2017-11-22T11:09:02.590 回答