Finding unused SpecFlow step implementations with PowerShell

SpecFlow steps are public methods adorned using the [Given], [When], and [Then] attributes inside classes marked with the [Binding] attribute.

To load the assembly containing the compiled SpecFlow steps, I found it necessary to load all other assemblies inside the bin directory. Otherwise an error would occur in the assembly’s GetTypes() method stating the references to other assemblies could not be resolved.

$asm = [System.Reflection.Assembly]::LoadFrom("$basedir\$specdll", 
$null, 0)
$types = $asm.GetTypes()

Next, the SpecFlow attribute types are retrieved

$binding = [TechTalk.SpecFlow.BindingAttribute]
$given = [TechTalk.SpecFlow.GivenAttribute]
$when = [TechTalk.SpecFlow.WhenAttribute]
$then = [TechTalk.SpecFlow.ThenAttribute]

along with all [Binding] classes and there methods with the attributes listed above.

The attributes are collected in an array, as their Regex property contains the regular expression that will be used to search the .feature files using PowerShell’s select-string cmdlet.

:Outer foreach($a in $attributes) {    
foreach($ff in $featurefiles) {
        $found = $featurefilecontents[$ff] | 
select-string -Pattern $a.Regex -CaseSensitive
        if ($found.Matches.Length -gt 0) {
            #write-host "found $($a.Regex) in file $ff"
            $foundattributes += $a
            continue Outer
    write-host "did not found reference for $($a.GetType().Name) $($a.Regex)"
    $notfoundattributes += $a

The script has been developed to analyze a project using SpecFlow 2.4.0, and is available on my PowerShell Snippets repository.