confusion about pester

function test-PesterPipelineIssue ($filePath) {
    Get-ChildItem /Users/ | Out-File $filePath
    $list = Get-Content $filePath
    return $list
}

describe "test-PesterPipelineIssue" {
    context "running into weird issues with pester statements"  {
        It "given a list of things on the left hand side right hand side should populate"{
            test-PesterPipelineIssue /Users/me/testingDir/testPester.txt | Should beNullOrEmpty
        }
    }
}