Redirect Out-File to write to TestDrive: during Pester execution

redirect-out-file.tests.ps1

BeforeAll {
    $OutFile = Get-Command -Name 'Out-File'

    Mock Out-File -ParameterFilter { $FilePath -match 'file.txt' } -MockWith {
        $InputObject = $PesterBoundParameters['InputObject']
        & $OutFile -InputObject $InputObject -FilePath (Join-Path $TestDrive 'file.txt')
    }
}

It 'Should update the file with the expected values' {

    $FilePath = (Join-Path $TestDrive 'file.txt')

    $FilePath | Should -FileContentMatch 'expectedstring1'
    $FilePath | Should -FileContentMatch 'expectedstring2'
    $FilePath | Should -FileContentMatch 'expectedstring3'
}