Question

是什么让Assert-VerifiableMocks与Pester中的Assert-MockCalled不同？我一直在读

但仍然想知道：以下代码部分是等效且可互换的吗？

使用Assert-MockCalled：

Mock Invoke-MongoCommmand {}
Set-TargetResource -UserName $test_username -Ensure "Absent"
Assert-MockCalled Invoke-MongoCommand -ParameterFilter {
    $Expression -eq "db.dropUser('$test_username')"
}

使用Assert-VerifiableMocks：

Mock Invoke-MongoCommand {} -Verifiable -ParameterFilter {
    $Expression -eq "db.dropUser('$test_username')"
}
Set-TargetResource -UserName $test_username -Ensure "Absent"
Assert-VerifiableMocks

Answer 1

在你的样本中它们是相同的，但它是关于你想要检查的方式和内容。例如，您要检查是否未调用某些内容。您可能会使用：

Assert-MockCalled xxx -Times 0 -ParameterFilter {$x -eq "foo"}

使用Assert-VerifiableMocks

这是不可能的

Answer 2

Assert-VerifiableMocks的功能不是Assert-MockCalled的一个子集，它是一个不相交的集合。使用Assert-VerifiableMocks，您可以验证同时调用多个模拟，但如前所述，您无法验证是否未调用任何模拟。我在下面有一个例子来更全面地解释测试示例'Get-ValueSum'的这两个差异。

如果您注意到Assert-verifiableMocks，则可以验证测试是否在单个断言中调用了所有预期的模拟。

Assert-Verifiable Sample

describe 'Assert-MockCalled vs Assert-VerifiableMocks in Pester' {
    function Get-Value1{ 1}
    function Get-Value2{ 2}
    function Get-Value3{ 3}

    # Should never be called by Get-ValueSum
    function Get-Value4{ 4}

    # Sums Value 1, 2 & 3, but 4 only if $include4 is specified
    function Get-ValueSum
    {
        param([switch] $inclued4 )
        if($inclued4)
        {
            return (Get-Value1) + (Get-Value2) + (Get-Value3)
        }
        else
        {
            return (Get-Value1) + (Get-Value2) + (Get-Value3)
        }
    }

    context 'assert verifiable' {
        # Mark the first 3 mocks as verifiable 
        # because they should not be called 
        mock -CommandName Get-Value1 -MockWith { 2} -Verifiable
        mock -CommandName Get-Value2 -MockWith { 3} -Verifiable
        mock -CommandName Get-Value3 -MockWith { 4} -Verifiable
        # Add this so we can verify it is not called
        mock -CommandName Get-Value4 -MockWith { 99} 

        $result = Get-ValueSum

        it 'Should call the 3 expected value calls' {
            Assert-VerifiableMocks
        }

        it 'should not call get-value 4' {
            Assert-MockCalled -CommandName Get-Value4 -Times 0
        }

        it 'should have gotten a sum of 9' {
            $result | should be 9
        }
        # add test for #$include4
    }
}

Assert-MockCalled示例

describe 'Assert-MockCalled vs Assert-VerifiableMocks in Pester' {
    function Get-Value1{ 1}
    function Get-Value2{ 2}
    function Get-Value3{ 3}

    # Should never be called by Get-ValueSum
    function Get-Value4{ 4}

    # Sums Value 1, 2 & 3, but 4 only if $include4 is specified
    function Get-ValueSum
    {
        param([switch] $inclued4 )
        if($inclued4)
        {
            return (Get-Value1) + (Get-Value2) + (Get-Value3)
        }
        else
        {
            return (Get-Value1) + (Get-Value2) + (Get-Value3)
        }
    }

    context 'assert mock called method' {
        # Add all mocks so we can verify 
        # if they were called or not individually
        mock -CommandName Get-Value1 -MockWith { 3} 
        mock -CommandName Get-Value2 -MockWith { 4} 
        mock -CommandName Get-Value3 -MockWith { 5} 
        mock -CommandName Get-Value4 -MockWith { 99} 

        $result = Get-ValueSum

        it 'Should call the 3 expected value calls' {
            Assert-MockCalled -CommandName Get-Value1 -Times 1
            Assert-MockCalled -CommandName Get-Value2 -Times 1
            Assert-MockCalled -CommandName Get-Value3 -Times 1
        }

        it 'should not call get-value 4' {
            Assert-MockCalled -CommandName Get-Value4 -Times 0
        }

        it 'should have gotten a sum of 12' {
            $result | should be 12
        }
        # add test for #$include4
    }
}

在Pester中断言-MockCalled与Assert-VerifiableMocks

2 个答案:

Assert-Verifiable Sample

Assert-MockCalled示例