Basic PowerShell Convertor for MSTest to xUnit

This is just a quick script that can help convert a .Tests.csproj which was originally written for MS Test over to using xUnit. It probably doesn’t cover every conversion aspect, but it can get you moving in the right direction.

What it will convert:

• Replace using Microsoft.VisualStudio.TestTools.UnitTesting; with using Xunit;
• Remove [TestClass]
• Replace [TestMethod] with [Fact]
• Replace Assert.AreEqual with Assert.Equal
• Replace Assert.IsTrue with Assert.True
• Replace Assert.IsFalse with Assert.False
• Replace Assert.IsNull with Assert.Null
• Replace Assert.IsNotNull with Assert.NotNull

	function Convert-VisualStudioTestsToXunit {
	param(
	[string] $Path
	)
	# input validation
	Test-ProjFilePath -Path $Path
	# conversion
	#. $codeFormatter $Path
	$parent = Split-Path -Path $Path
	$csfiles = dir -Path $parent -Recurse -Include *.cs
	function replaceTestClass($Line, [ref] $touched) {
	if($Line -eq $null) { return $null }
	if($Line -match "\[TestClass\]") {
	$touched.Value = $true
	return $null
	}
	return $Line
	}
	function replaceTestMethod($Line, [ref] $touched) {
	if($Line -eq $null) { return $null }
	if($Line -match "(.*)\[TestMethod\](.*)") {
	$touched.Value = $true
	$l = "{0}[Fact]{1}" -f $Matches[1], $Matches[2]
	return $l
	}
	return $Line
	}
	function replaceAreEqual($Line, [ref] $touched) {
	if($Line -eq $null) { return $null }
	if($Line -match "(.*)Assert\.AreEqual(.*)") {
	$touched.Value = $true
	$l = "{0}Assert.Equal{1}" -f $Matches[1], $Matches[2]
	return $l
	}
	return $Line
	}
	function replaceIsTrue($Line, [ref] $touched) {
	if($Line -eq $null) { return $null }
	if($Line -match "(.*)Assert\.IsTrue(.*)") {
	$touched.Value = $true
	$l = "{0}Assert.True{1}" -f $Matches[1], $Matches[2]
	return $l
	}
	return $Line
	}
	function replaceIsFalse($Line, [ref] $touched) {
	if($Line -eq $null) { return $null }
	if($Line -match "(.*)Assert\.IsFalse(.*)") {
	$touched.Value = $true
	$l = "{0}Assert.False{1}" -f $Matches[1], $Matches[2]
	return $l
	}
	return $Line
	}
	function replaceIsNull($Line, [ref] $touched) {
	if($Line -eq $null) { return $null }
	if($Line -match "(.*)Assert\.IsNull(.*)") {
	$touched.Value = $true
	$l = "{0}Assert.Null{1}" -f $Matches[1], $Matches[2]
	return $l
	}
	return $Line
	}
	function replaceIsNotNull($Line, [ref] $touched) {
	if($Line -eq $null) { return $null }
	if($Line -match "(.*)Assert\.IsNotNull(.*)") {
	$touched.Value = $true
	$l = "{0}Assert.NotNull{1}" -f $Matches[1], $Matches[2]
	return $l
	}
	return $Line
	}
	function replaceUsing($Line, [ref] $touched) {
	if($Line -eq $null) { return $null }
	if($Line -match "(.*)using Microsoft\.VisualStudio\.TestTools\.UnitTesting;(.*)") {
	$touched.Value = $true
	$l = "{0}using Xunit;{1}" -f $Matches[1], $Matches[2]
	return $l
	}
	return $Line
	}
	foreach($f in $csfiles) {
	$content = Get-Content -Path $f.FullName
	$touched = $false
	$converted = @()
	foreach($line in $content) {
	$updated = $line
	$updated = replaceTestClass -Line $updated -Touched ([ref] $touched)
	$updated = replaceTestMethod -Line $updated -Touched ([ref] $touched)
	$updated = replaceAreEqual -Line $updated -Touched ([ref] $touched)
	$updated = replaceIsTrue -Line $updated -Touched ([ref] $touched)
	$updated = replaceIsFalse -Line $updated -Touched ([ref] $touched)
	$updated = replaceIsNull -Line $updated -Touched ([ref] $touched)
	$updated = replaceUsing -Line $updated -Touched ([ref] $touched)
	if($null -ne $updated) {
	$converted += @($updated)
	}
	}
	#Write-Host ($f.FullName + ": ") -NoNewline
	if($touched) {
	#Write-Host "Updated" -ForegroundColor Green
	$converted | Set-Content -Path $f.FullName -Force
	} else {
	#Write-Host "Untouched" -ForegroundColor Gray
	}
	}
	}

view raw Convert-VisualStudioTestsToXunit.ps1 hosted with ❤ by GitHub

	function Test-ProjFilePath {
	param(
	[string] $Path
	)
	# input validation
	if((Test-Path -Path $Path) -eq $false) {
	throw "Could not find a file at $Path. Please ensure the path was entered correctly."
	}
	$fi = Get-Item -Path $Path
	$ext = $fi.Extension
	if($null -eq $ext) {
	throw "No file extension was found for the file at $Path. This can only convert .csproj and .vbproj files at the moment."
	}
	$ext = $ext.ToLower()
	if(@(".csproj", ".vbproj") -notcontains $ext) {
	throw "Could not find a .csproj/.vbproj file at $Path. This can only convert .csproj and .vbproj files at the moment."
	}
	}

view raw Test-ProjFilePath.ps1 hosted with ❤ by GitHub