Tests/Unit/MSFT_WindowsProcess.Tests.ps1

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[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSAvoidUsingConvertToSecureStringWithPlainText', '')]
param ()

$errorActionPreference = 'Stop'
Set-StrictMode -Version 'Latest'

$script:moduleRootPath = Split-Path -Path $PSScriptRoot -Parent
$script:testHelpersPath = Join-Path -Path $script:moduleRootPath -ChildPath 'TestHelpers'
Import-Module -Name (Join-Path -Path $script:testHelpersPath -ChildPath 'CommonTestHelper.psm1')

$script:testEnvironment = Enter-DscResourceTestEnvironment `
    -DscResourceModuleName 'PSDscResources' `
    -DscResourceName 'MSFT_WindowsProcess' `
    -TestType 'Unit'

try
{
    InModuleScope 'MSFT_WindowsProcess' {

        # Mock objects
        $script:validPath1 = 'ValidPath1'
        $script:validPath2 = 'ValidPath2'
        $script:validPath3 = 'ValidPath3'
        $script:invalidPath = 'InvalidPath'
        $script:testUserName = 'TestUserName12345'
        $testPassword = 'StrongOne7.'
        $testSecurePassword = ConvertTo-SecureString -String $testPassword -AsPlainText -Force
        $script:testCredential = New-Object PSCredential ($script:testUserName, $testSecurePassword)
        $script:exceptionMessage = 'Test Invalid Operation Exception'

        $script:mockProcess1 = @{
            Path = $script:validPath1
            CommandLine = 'C:\temp\test.exe argument1 argument2 argument3'
            Arguments = 'argument1 argument2 argument3'
            ProcessId = 12345
            Id = 12345
            PagedMemorySize64 = 1048
            NonpagedSystemMemorySize64 = 16
            VirtualMemorySize64 = 256
            HandleCount = 50
        }

        $script:mockProcess2 = @{
            Path = $script:validPath2
            CommandLine = ''
            Arguments = ''
            ProcessId = 54321
            Id = 54321
            PagedMemorySize64 = 2096
            NonpagedSystemMemorySize64 = 8
            VirtualMemorySize64 = 512
            HandleCount = 5
        }

        $script:mockProcess3 = @{
            Path = $script:validPath1
            CommandLine = 'C:\test.exe arg6'
            Arguments = 'arg6'
            ProcessId = 1111101
            Id = 1111101
            PagedMemorySize64 = 512
            NonpagedSystemMemorySize64 = 32
            VirtualMemorySize64 = 64
            HandleCount = 0
        }

        $script:mockProcess4 = @{
            Path = $script:validPath1
            CommandLine = 'C:\test.exe arg6'
            Arguments = 'arg6'
            ProcessId = 1111101
            Id = 1111101
            PagedMemorySize64 = 510
            NonpagedSystemMemorySize64 = 16
            VirtualMemorySize64 = 8
            HandleCount = 8
        }

        $script:errorProcess = @{
            Path = $script:validPath3
            CommandLine = ''
            Arguments = ''
            ProcessId = 77777
            Id = 77777
            PagedMemorySize64 = 0
            NonpagedSystemMemorySize64 = 0
            VirtualMemorySize64 = 0
            HandleCount = 0
        }

        Describe 'WindowsProcess\Get-TargetResource' {
            Mock -CommandName Expand-Path -MockWith { return $Path }
            Mock -CommandName Get-ProcessCimInstance -MockWith { 
                if ($Path -eq $script:validPath1)
                {
                    return @($script:mockProcess1, $script:mockProcess3) 
                }
                elseif ($Path -eq $script:validPath2)
                {
                    return @($script:mockProcess2)
                }
                elseif ($Path -eq $script:validPath3)
                {
                    return @($script:errorProcess)
                }
                else
                {
                    return @()
                }
            }
            Mock -CommandName Get-Process -MockWith {
                if ($ID -eq $script:mockProcess1.Id)
                {
                    return $script:mockProcess1 
                }
                elseif ($script:mockProcess2.Id)
                {
                    return $script:mockProcess2
                }
                elseif ($script:mockProcess3.Id)
                {
                    return $script:mockProcess3
                }
                else
                {
                    return $script:errorProcess
                }
            }
            Mock -CommandName New-InvalidOperationException -MockWith { Throw $script:exceptionMessage }
            Mock -CommandName New-InvalidArgumentException -MockWith { Throw $script:exceptionMessage }
            
            It 'Should return the correct properties for a process that is Absent' {
                $processArguments = 'TestGetProperties'
        
                $getTargetResourceResult = Get-TargetResource -Path $invalidPath `
                                                              -Arguments $processArguments
        
                $getTargetResourceResult.Arguments | Should Be $processArguments
                $getTargetResourceResult.Ensure | Should Be 'Absent'
                $getTargetResourceResult.Path  | Should Be $invalidPath
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
            }
        
            It 'Should return the correct properties for one process with a credential' {
        
                $getTargetResourceResult = Get-TargetResource -Path $script:validPath2 `
                                                              -Arguments $script:mockProcess2.Arguments `
                                                              -Credential $script:testCredential
                
                $getTargetResourceResult.VirtualMemorySize | Should Be $script:mockProcess2.VirtualMemorySize64
                $getTargetResourceResult.Arguments | Should Be $script:mockProcess2.Arguments
                $getTargetResourceResult.Ensure | Should Be 'Present'
                $getTargetResourceResult.PagedMemorySize | Should Be $script:mockProcess2.PagedMemorySize64
                $getTargetResourceResult.Path | Should Be $script:mockProcess2.Path
                $getTargetResourceResult.NonPagedMemorySize | Should Be $script:mockProcess2.NonpagedSystemMemorySize64
                $getTargetResourceResult.HandleCount | Should Be $script:mockProcess2.HandleCount
                $getTargetResourceResult.ProcessId | Should Be $script:mockProcess2.ProcessId
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
            }
         
            It 'Should return the correct properties when there are multiple processes' {
        
                $getTargetResourceResult = Get-TargetResource -Path $script:validPath1 `
                                                              -Arguments $script:mockProcess1.Arguments
                
                $getTargetResourceResult.VirtualMemorySize | Should Be $script:mockProcess1.VirtualMemorySize64
                $getTargetResourceResult.Arguments | Should Be $script:mockProcess1.Arguments
                $getTargetResourceResult.Ensure | Should Be 'Present'
                $getTargetResourceResult.PagedMemorySize | Should Be $script:mockProcess1.PagedMemorySize64
                $getTargetResourceResult.Path | Should Be $script:mockProcess1.Path
                $getTargetResourceResult.NonPagedMemorySize | Should Be $script:mockProcess1.NonpagedSystemMemorySize64
                $getTargetResourceResult.HandleCount | Should Be $script:mockProcess1.HandleCount
                $getTargetResourceResult.ProcessId | Should Be $script:mockProcess1.ProcessId
                
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
            }
        }
        
        Describe 'WindowsProcess\Set-TargetResource' {
            Mock -CommandName Expand-Path -MockWith { return $Path }
            Mock -CommandName Get-ProcessCimInstance -MockWith { 
                if ($Path -eq $script:validPath1)
                {
                    return @($script:mockProcess1, $script:mockProcess3) 
                }
                elseif ($Path -eq $script:validPath2)
                {
                    return @($script:mockProcess2)
                }
                elseif ($Path -eq $script:validPath3)
                {
                    return @($script:errorProcess)
                }
                else
                {
                    return @()
                }
            }
            Mock -CommandName New-InvalidOperationException -MockWith { Throw $script:exceptionMessage }
            Mock -CommandName New-InvalidArgumentException -MockWith { Throw $script:exceptionMessage }
            Mock -CommandName Stop-Process -MockWith { return $null } `
                                           -ParameterFilter { ($Id -contains $script:mockProcess1.ProcessId) -or `
                                                              ($Id -contains $script:mockProcess2.ProcessId) -or `
                                                              ($Id -contains $script:mockProcess3.ProcessId) }
            Mock -CommandName Stop-Process -MockWith { return 'error' } `
                                           -ParameterFilter { $Id -contains $script:errorProcess.ProcessId}
            Mock -CommandName Test-IsRunFromLocalSystemUser -MockWith { return $true }
            Mock -CommandName Wait-ProcessCount -MockWith { return $true }

            It 'Should not throw when Ensure set to Absent and processes are running' {
                { Set-TargetResource -Path $script:validPath1 `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Credential $script:testCredential `
                                     -Ensure 'Absent'
                } | Should Not Throw
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Stop-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 1 -Scope It
            }
        
            It 'Should not throw when Ensure set to Absent and processes are not running' {
                { Set-TargetResource -Path $script:invalidPath `
                                     -Arguments '' `
                                     -Ensure 'Absent'
                } | Should Not Throw
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Stop-Process -Exactly 0 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 0 -Scope It
            }
        
            It 'Should throw an invalid operation exception when Stop-Process throws an error' {
                { Set-TargetResource -Path $script:errorProcess.Path `
                                     -Arguments '' `
                                     -Ensure 'Absent'
                } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Stop-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName New-InvalidOperationException -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 0 -Scope It
            }
            
            Mock -CommandName Wait-ProcessCount -MockWith { return $false }

            It 'Should throw an invalid operation exception when there is a problem waiting for the processes' {
                { Set-TargetResource -Path $script:validPath1 `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Ensure 'Absent'
                } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Stop-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 1 -Scope It
                Assert-MockCalled -CommandName New-InvalidOperationException -Exactly 1 -Scope It
            }
        
            Mock -CommandName Wait-ProcessCount -MockWith { return $true }
            Mock -CommandName Start-ProcessAsLocalSystemUser -MockWith {}

            It 'Should not throw when Ensure set to Present and processes are not running and credential passed in' {
                { Set-TargetResource -Path $script:invalidPath `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Credential $script:testCredential `
                                     -Ensure 'Present'
                } | Should Not Throw
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Test-IsRunFromLocalSystemUser -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Start-ProcessAsLocalSystemUser -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 1 -Scope It
            }
            
            Mock -CommandName Start-ProcessAsLocalSystemUser -MockWith {}
            Mock -CommandName Assert-PathArgumentRooted -MockWith {}
            Mock -CommandName Assert-PathArgumentValid -MockWith {}

            It 'Should throw when Ensure set to Present, processes not running and credential and WorkingDirectory passed' {
                { Set-TargetResource -Path $script:invalidPath `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Credential $script:testCredential `
                                     -WorkingDirectory 'test working directory' `
                                     -Ensure 'Present'
                } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Test-IsRunFromLocalSystemUser -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Start-ProcessAsLocalSystemUser -Exactly 0 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 0 -Scope It
                Assert-MockCalled -CommandName Assert-PathArgumentRooted -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Assert-PathArgumentValid -Exactly 1 -Scope It
                Assert-MockCalled -CommandName New-InvalidArgumentException -Exactly 1 -Scope It
            }
            
            $testErrorRecord = 'test Start-ProcessAsLocalSystemUser error record'
            Mock -CommandName Start-ProcessAsLocalSystemUser -MockWith { Throw $testErrorRecord }

            It 'Should throw when Ensure set to Present and Start-processAsLocalSystemUser fails' {
                { Set-TargetResource -Path $script:invalidPath `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Credential $script:testCredential `
                                     -Ensure 'Present'
                } | Should Throw $testErrorRecord
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Test-IsRunFromLocalSystemUser -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Start-ProcessAsLocalSystemUser -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 0 -Scope It
            }
            
            Mock -CommandName Start-Process -MockWith {}

            It 'Should not throw when Ensure set to Present and processes are not running and no credential passed' {
                { Set-TargetResource -Path $script:invalidPath `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Ensure 'Present'
                } | Should Not Throw
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Start-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 1 -Scope It
            }
            
            $mockStartProcessException = New-Object -TypeName 'InvalidOperationException' `
                                                        -ArgumentList @('Start-Process test exception')
            Mock -CommandName Start-Process -MockWith { Throw $mockStartProcessException }

            It 'Should throw when Ensure set to Present and Start-Process fails' {
                { Set-TargetResource -Path $script:invalidPath `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Ensure 'Present'
                } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Start-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 0 -Scope It
                Assert-MockCalled -CommandName New-InvalidOperationException -Exactly 1 -Scope It
            }
            
            Mock -CommandName Wait-ProcessCount -MockWith { return $false }
            Mock -CommandName Start-Process -MockWith {}

            It 'Should throw when there is a failure waiting for the process to start' {
                { Set-TargetResource -Path $script:invalidPath `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Ensure 'Present'
                } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Start-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 1 -Scope It
            }
            
            Mock -CommandName Wait-ProcessCount -MockWith { return $true }

            It 'Should not throw when Ensure set to Present and processes are already running' {
                { Set-TargetResource -Path $script:validPath1 `
                                     -Arguments $script:mockProcess1.Arguments `
                                     -Ensure 'Present'
                } | Should Not Throw
        
                Assert-MockCalled -CommandName Expand-Path -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessCimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Start-Process -Exactly 0 -Scope It
                Assert-MockCalled -CommandName Wait-ProcessCount -Exactly 0 -Scope It
            }
        }
        
        Describe 'WindowsProcess\Test-TargetResource' {
            Mock -CommandName Expand-Path -MockWith { return $Path }
            Mock -CommandName Get-ProcessCimInstance -MockWith { 
                if ($Path -eq $script:validPath1)
                {
                    return @($script:mockProcess1, $script:mockProcess3) 
                }
                elseif ($Path -eq $script:validPath2)
                {
                    return @($script:mockProcess2)
                }
                elseif ($Path -eq $script:validPath3)
                {
                    return @($script:errorProcess)
                }
                else
                {
                    return @()
                }
            }

            It 'Should return true when Ensure set to Present and process is running' {
                $testTargetResourceResult = Test-TargetResource -Path $script:validPath1 `
                                                                -Arguments $script:mockProcess1.Arguments `
                                                                -Ensure 'Present'
                $testTargetResourceResult | Should Be $true
            }
        
            It 'Should return false when Ensure set to Present and process is not running' {
                $testTargetResourceResult = Test-TargetResource -Path $script:invalidPath `
                                                                -Arguments $script:mockProcess1.Arguments `
                                                                -Ensure 'Present'
                $testTargetResourceResult | Should Be $false
            }
        
            It 'Should return true when Ensure set to Absent and process is not running and Credential passed' {
                $testTargetResourceResult = Test-TargetResource -Path $script:invalidPath `
                                                                -Arguments $script:mockProcess1.Arguments `
                                                                -Credential $script:testCredential `
                                                                -Ensure 'Absent'
                $testTargetResourceResult | Should Be $true
            }
        
            It 'Should return false when Ensure set to Absent and process is running' {
                $testTargetResourceResult = Test-TargetResource -Path $script:validPath1 `
                                                                -Arguments $script:mockProcess1.Arguments `
                                                                -Ensure 'Absent'
                $testTargetResourceResult | Should Be $false
            }
        
        }
        
        Describe 'WindowsProcess\Expand-Path' {
            Mock -CommandName New-InvalidArgumentException -MockWith { Throw $script:exceptionMessage }
            Mock -CommandName Test-Path -MockWith { return $true }

            It 'Should return the original path when path is rooted' {
                $rootedPath = 'C:\testProcess.exe'
        
                $expandPathResult = Expand-Path -Path $rootedPath
                $expandPathResult | Should Be $rootedPath
            }
            
            Mock -CommandName Test-Path -MockWith { return $false }

            It 'Should throw an invalid argument exception when Path is rooted and does not exist' {
                $rootedPath = 'C:\invalidProcess.exe'
        
                { Expand-Path -Path $rootedPath} | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName New-InvalidArgumentException -Exactly 1 -Scope It
            }
        
            It 'Should throw an invalid argument exception when Path is unrooted and does not exist' {
                 $unrootedPath = 'invalidfile.txt'
        
                 { Expand-Path -Path $unrootedPath} | Should Throw $script:exceptionMessage
        
                 Assert-MockCalled -CommandName New-InvalidArgumentException -Exactly 1 -Scope It
            }
        }
        
        Describe 'WindowsProcess\Get-ProcessCimInstance' {
            Mock -CommandName Get-Process -MockWith { return @($script:mockProcess2) }
            Mock -CommandName Get-CimInstance -MockWith { return $script:mockProcess2 }

            It 'Should return the correct process when it exists and no arguments passed' {
                $resultProcess = Get-ProcessCimInstance -Path $script:mockProcess2.Path
                $resultProcess | Should Be @($script:mockProcess2)
        
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-CimInstance -Exactly 1 -Scope It
            }
            
            Mock -CommandName Get-Process -MockWith { return @($script:mockProcess1) }
            Mock -CommandName Get-CimInstance -MockWith { return $script:mockProcess1 }

            It 'Should return the correct process when it exists and arguments are passed' {
                $resultProcess = Get-ProcessCimInstance -Path $script:mockProcess1.Path `
                                                  -Arguments $script:mockProcess1.Arguments
                $resultProcess | Should Be @($script:mockProcess1)
        
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-CimInstance -Exactly 1 -Scope It
            }
            
            $expectedProcesses = @($script:mockProcess1, $script:mockProcess1, $script:mockProcess1)
            Mock -CommandName Get-Process -MockWith { return $expectedProcesses }
            Mock -CommandName Get-CimInstance -MockWith { return $script:mockProcess1 }

            It 'Should return the correct processes when multiple exist' {
                $resultProcess = Get-ProcessCimInstance -Path $script:mockProcess1.Path `
                                                  -Arguments $script:mockProcess1.Arguments

                Compare-Object -ReferenceObject $expectedProcesses -DifferenceObject $resultProcess | Should Be $null
        
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-CimInstance -Exactly 3 -Scope It
            }
            
            Mock -CommandName Get-Process -MockWith { return @($script:mockProcess2, $script:mockProcess2) }
            Mock -CommandName Get-CimInstance -MockWith { return @($script:mockProcess2, $script:mockProcess2) }

            It 'Should return the correct processes when they exists and cim instance threshold is lower than number of processes found' {
                $resultProcess = Get-ProcessCimInstance -Path $script:mockProcess2.Path `
                                                  -Arguments $script:mockProcess2.Arguments `
                                                  -UseGetCimInstanceThreshold 1
                $resultProcess | Should Be @($script:mockProcess2, $script:mockProcess2)
        
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-CimInstance -Exactly 1 -Scope It
            }
            
            Mock -CommandName Get-Process -MockWith { return @($script:mockProcess2) }
            Mock -CommandName Get-CimInstance -MockWith { return $script:mockProcess2 }
            Mock -CommandName Get-ProcessOwner -MockWith { return ($env:computerName + '\' + $script:testUsername) } `
                                               -ParameterFilter { ($Process -eq $script:mockProcess2) }

            It 'Should return the correct process when it exists and Credential is passed in' {
                $resultProcess = Get-ProcessCimInstance -Path $script:mockProcess2.Path `
                                                  -Credential $script:testCredential
                $resultProcess | Should Be @($script:mockProcess2)
        
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-CimInstance -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-ProcessOwner -Exactly 1 -Scope It
            }
            
            Mock -CommandName Get-Process -MockWith { return @($script:mockProcess3, $script:mockProcess3, $script:mockProcess4, $script:mockProcess2) }
            Mock -CommandName Get-CimInstance -MockWith { return @($script:mockProcess3, $script:mockProcess3, $script:mockProcess4, $script:mockProcess2) }
            Mock -CommandName Get-ProcessOwner -MockWith { return ($env:computerName + '\' + $script:testUsername) } `
                                               -ParameterFilter { ($Process -eq $script:mockProcess3) }
            Mock -CommandName Get-ProcessOwner -MockWith { return ('wrongDomain' + '\' + $script:testUsername) } `
                                               -ParameterFilter { ($Process -eq $script:mockProcess4) -or ($Process -eq $script:mockProcess2) }

            It 'Should return only processes that match Credential' {
                $resultProcess = Get-ProcessCimInstance -Path $script:mockProcess3.Path `
                                                        -Credential $script:testCredential `
                                                        -Arguments $script:mockProcess3.Arguments `
                                                        -UseGetCimInstanceThreshold 1
                $resultProcess | Should Be @($script:mockProcess3, $script:mockProcess3)
        
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-CimInstance -Exactly 1 -Scope It
            }
            
            Mock -CommandName Get-ProcessOwner -MockWith { return ($env:computerName + '\' + $script:testUsername) } `
                                               -ParameterFilter { ($Process -eq $script:mockProcess3) -or ($Process -eq $script:mockProcess2) }
            Mock -CommandName Get-ProcessOwner -MockWith { return ('wrongDomain' + '\' + $script:testUsername) } `
                                               -ParameterFilter { ($Process -eq $script:mockProcess4) }

            It 'Should return only processes that match Credential and Arguments' {
                $resultProcess = Get-ProcessCimInstance -Path $script:mockProcess3.Path `
                                                        -Credential $script:testCredential `
                                                        -Arguments $script:mockProcess3.Arguments `
                                                        -UseGetCimInstanceThreshold 1
                $resultProcess | Should Be @($script:mockProcess3, $script:mockProcess3)
        
                Assert-MockCalled -CommandName Get-Process -Exactly 1 -Scope It
                Assert-MockCalled -CommandName Get-CimInstance -Exactly 1 -Scope It
            }
        }
        
        Describe 'WindowsProcess\ConvertTo-EscapedStringForWqlFilter' {
            It 'Should return the same string when there are no escaped characters' {
                $inputString = 'testString%$.@123'
                $convertedString = ConvertTo-EscapedStringForWqlFilter -FilterString $inputString
                $convertedString | Should Be $inputString
            }
        
            It 'Should return a string with escaped characters: ("\)' {
                $inputString = '\test"string"\123'
                $expectedString = '\\test\"string\"\\123'
                $convertedString = ConvertTo-EscapedStringForWqlFilter -FilterString $inputString
                $convertedString | Should Be $expectedString
            }
        
            It "Should return a string with escaped characters: ('\)" {
                $inputString = "\test'string'\123"
                $expectedString = "\\test\'string\'\\123"
                $convertedString = ConvertTo-EscapedStringForWqlFilter -FilterString $inputString
                $convertedString | Should Be $expectedString
            }
        }
        
        Describe 'WindowsProcess\Get-ProcessOwner' {
            $mockOwner = @{
                Domain = 'Mock Domain'
                User = 'Mock User'
            } 
            Mock -CommandName Get-ProcessOwnerCimInstance -MockWith { return $mockOwner }

            It 'Should return the correct string with domain\user' {
                $owner = Get-ProcessOwner -Process $script:mockProcess1
                $owner | Should Be ($mockOwner.Domain + '\' + $mockOwner.User)
            }
        
            It 'Should return the correct string with default-domain\user when domain is not there' {
                $mockOwner.Domain = $null
                $owner = Get-ProcessOwner -Process $script:mockProcess1
                $owner | Should Be ($env:computerName + '\' + $mockOwner.User)
            }
        
        }
        
        Describe 'WindowsProcess\Get-ArgumentsFromCommandLineInput' {  
            It 'Should return the correct arguments when single quotes are used' {
                $inputString = 'test.txt a b c'
                $argumentsReturned = Get-ArgumentsFromCommandLineInput -CommandLineInput $inputString
                $argumentsReturned | Should Be 'a b c'
            }
        
            It 'Should return the correct arguments when double quotes are used' {
                $inputString = '"test file test" a b c'
                $argumentsReturned = Get-ArgumentsFromCommandLineInput -CommandLineInput $inputString
                $argumentsReturned | Should Be 'a b c'
            }
        
            It 'Should return an empty string when an empty string is passed in' {
                $inputString = $null
                $resultString = [String]::Empty
                $argumentsReturned = Get-ArgumentsFromCommandLineInput -CommandLineInput $inputString
                $argumentsReturned | Should Be $resultString
            }
        
            It 'Should return an empty string when there are no arguments' {
                $inputString = 'test.txt'
                $resultString = [String]::Empty
                $argumentsReturned = Get-ArgumentsFromCommandLineInput -CommandLineInput $inputString
                $argumentsReturned | Should Be $resultString
            }
        }
        
        Describe 'WindowsProcess\Assert-HashtableDoesNotContainKey' {
            $mockHashtable = @{
                Key1 = 'test key1'
                Key2 = 'test key2'
                Key3 = 'test key3'
            }
            Mock -CommandName New-InvalidArgumentException -MockWith { Throw $script:exceptionMessage }
        
            It 'Should not throw an exception if the hashtable does not contain a key' {
                $mockKey = @('k1', 'k2', 'k3', 'k4', 'k5')
                { Assert-HashTableDoesNotContainKey -Hashtable $mockHashtable -Key $mockKey } | Should Not Throw
            }
        
            It 'Should throw an exception if the hashtable contains a key' {
                $mockKey = @('k1', 'k2', 'Key3', 'k4', 'k5')
                { Assert-HashTableDoesNotContainKey -Hashtable $mockHashtable -Key $mockKey } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName New-InvalidArgumentException -Exactly 1 -Scope It
            }
        }
        
        Describe 'WindowsProcess\Wait-ProcessCount' {
            $mockProcessSettings = @{ 
                Path = 'mockPath' 
                Arguments = 'mockArguments'
            }
            Mock -CommandName Get-ProcessCimInstance -MockWith { return @($script:mockProcess1, $script:mockProcess3) }

            It 'Should return true when all processes are returned' {
                $processCountResult = Wait-ProcessCount -ProcessSettings $mockProcessSettings -ProcessCount 2
                $processCountResult | Should Be $true
            }
        
            It 'Should return false when not all processes are returned' {
                $processCountResult = Wait-ProcessCount -ProcessSettings $mockProcessSettings `
                                                        -ProcessCount 3 `
                                                        -WaitTime 10
                $processCountResult | Should Be $false
            }
        }
        
        Describe 'WindowsProcess\Assert-PathArgumentRooted' {
            Mock -CommandName New-InvalidArgumentException -MockWith { Throw $script:exceptionMessage }

            It 'Should not throw when path is rooted' {
                $rootedPath = 'C:\testProcess.exe'
        
                { Assert-PathArgumentRooted -PathArgumentName 'mock test name' `
                                            -PathArgument $rootedPath } | Should Not Throw
            }
        
            It 'Should throw an invalid argument exception when Path is unrooted' {
                 $unrootedPath = 'invalidfile.txt'
        
        
                 { Assert-PathArgumentRooted -PathArgumentName 'mock test name' `
                                             -PathArgument $unrootedPath } | Should Throw $script:exceptionMessage
        
                 Assert-MockCalled -CommandName New-InvalidArgumentException -Exactly 1 -Scope It
            }
        }
        
        Describe 'WindowsProcess\Assert-PathArgumentValid' {
            Mock -CommandName New-InvalidArgumentException -MockWith { Throw $script:exceptionMessage }

            It 'Should not throw when path is valid' {
                Mock -CommandName Test-Path -MockWith { return $true }
        
                { Assert-PathArgumentValid -PathArgumentName 'test name' `
                                           -PathArgument 'validPath' } | Should Not Throw
            }
        
            It 'Should throw an invalid argument exception when Path is not valid' {
                Mock -CommandName Test-Path -MockWith { return $false }
        
                { Assert-PathArgumentValid -PathArgumentName 'test name' `
                                           -PathArgument 'invalidPath' } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName New-InvalidArgumentException -Exactly 1 -Scope It
            }
        }
        
        Describe 'WindowsProcess\Split-Credential' {
            Mock -CommandName New-InvalidArgumentException -MockWith { Throw $script:exceptionMessage }

            It 'Should return correct domain and username with @ seperator' {
                $testUsername = 'user@domain'
                $testPassword = ConvertTo-SecureString -String 'dummy' -AsPlainText -Force
                $testCredential = New-Object -TypeName 'PSCredential' -ArgumentList @($testUsername, $testPassword)
        
                $splitCredentialResult = Split-Credential -Credential $testCredential
        
                $splitCredentialResult.Domain | Should Be 'domain'
                $splitCredentialResult.Username | Should Be 'user'
            }
        
            It 'Should return correct domain and username with \ seperator' {
                $testUsername = 'domain\user'
                $testPassword = ConvertTo-SecureString -String 'dummy' -AsPlainText -Force
                $testCredential = New-Object -TypeName 'PSCredential' -ArgumentList @($testUsername, $testPassword)
        
                $splitCredentialResult = Split-Credential -Credential $testCredential
        
                $splitCredentialResult.Domain | Should Be 'domain'
                $splitCredentialResult.Username | Should Be 'user'
            }
        
            It 'Should return correct domain and username with a local user' {
                $testUsername = 'localuser'
                $testPassword = ConvertTo-SecureString -String 'dummy' -AsPlainText -Force
                $testCredential = New-Object -TypeName 'PSCredential' -ArgumentList @($testUsername, $testPassword)
        
                $splitCredentialResult = Split-Credential -Credential $testCredential
        
                $splitCredentialResult.Domain | Should Be $env:computerName
                $splitCredentialResult.Username | Should Be 'localuser'
            }
        
            It 'Should throw an invalid argument exception when more than one \ in username' {
                $testUsername = 'user\domain\foo'
                $testPassword = ConvertTo-SecureString -String 'dummy' -AsPlainText -Force
                $testCredential = New-Object -TypeName 'PSCredential' -ArgumentList @($testUsername, $testPassword)
                
                { $splitCredentialResult = Split-Credential -Credential $testCredential } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName New-InvalidArgumentException -Exactly 1 -Scope It
            }
        
            It 'Should throw an invalid argument exception when more than one @ in username' {
                $testUsername = 'user@domain@foo'
                $testPassword = ConvertTo-SecureString -String 'dummy' -AsPlainText -Force
                $testCredential = New-Object -TypeName 'PSCredential' -ArgumentList @($testUsername, $testPassword)
                
                { $splitCredentialResult = Split-Credential -Credential $testCredential } | Should Throw $script:exceptionMessage
        
                Assert-MockCalled -CommandName New-InvalidArgumentException -Exactly 1 -Scope It
            }
        }
    }        
}       
finally
{
    Exit-DscResourceTestEnvironment -TestEnvironment $script:testEnvironment
}