Some functions to help with Coverlet code coverage execution from CLI.

CcHelper.ps1

# Common useful commands
# Must be sourced first.
# . .\CcHelper.ps1

# Dependencies
# donet package add coverlet.msbuild
# dotnet tool install -g dotnet-reportgenerator-globaltool
# dotnet tool install --global coverlet.console

# Useful
# https://marketplace.visualstudio.com/items?itemName=FortuneNgwenya.FineCodeCoverage

$ErrorActionPreference = "Stop"

$comma = '%2C' # URL encoded comma. 
$exclude = "[*]*.Program${comma}[*]*.Controllers.*${comma}[*]*.Models.*${comma}[*]*.Exceptions*"
$excludeByAttribute = "Obsolete${comma}GeneratedCodeAttribute${comma}CompilerGeneratedAttribute"

$testFilter = "Category!=E2E"
$coverageRunSettingsPath = "CodeCoverage.runsettings" # Unused in coverlet.msbuild.  Relevant for coverlet.collector.
$coverletOutputFormat = "cobertura${comma}json"
#$testResultsDir=".\TestResults"
$testResultsDir="$($(Get-Location).Path)\TestResults"
$coverletJson = "$testResultsDir\CodeCoverageResults.json"
$coverageReportDir = "$testResultsDir\CoverageReport"

# Update below as needed
$lineThreshold=100
$branchThreshold=100
$methodThreshold=100

$threshold = "${lineThreshold}${comma}${branchThreshold}${comma}${methodThreshold}"
$thresholdType = "line${comma}branch${comma}method"
$thresholdStat = "total"  # Minimum, Average, Total

# /p:VSTestUseMSBuildOutput=false allows percentage results to be shown to console.
# Consider /p:DeterministicSourcePaths=true `

function Invoke-CodeCoverage { 
    Remove-CodeCoverageOutput
    $files = Get-ChildItem -Path $Path -Recurse -Filter "*sln"

    #Write-Host "dotnet test $files[0] --no-build --no-restore --results-directory:$testResultsDir /p:Exclude=""$exclude"" /p:ExcludeByAttribute=""$excludeByAttribute"""

    dotnet test $files[0] --filter $testFilter --results-directory:$testResultsDir --verbosity=minimal `
        /p:CollectCoverage=true `
        /p:CoverletOutput=$coverletJson `
        /p:CoverletOutputFormat=$coverletOutputFormat  `
        /p:MergeWith=$coverletJson `
        /p:VSTestUseMSBuildOutput=false `
        /p:IncludeTestAssembly=false `
        /p:Exclude="$exclude" `
        /p:ExcludeByAttribute=$excludeByAttribute
}

function Invoke-CodeCoverageWithThresholdSln { 
    Remove-CodeCoverageOutput
    $files = Get-ChildItem -Path $Path -Recurse -Filter "*sln"

    dotnet test $files[0] --filter $testFilter --results-directory:$testResultsDir --verbosity=minimal `
        /p:CollectCoverage=true `
        /p:Threshold=$threshold `
        /p:ThresholdType=$thresholdType `
        /p:ThresholdStat=$thresholdStat `
        /p:CoverletOutputFormat=$coverletOutputFormat  `
        /p:MergeWith=$coverletJson `
        /p:VSTestUseMSBuildOutput=false `
        /p:CoverletOutput=$coverletJson `
        /p:IncludeTestAssembly=false `
        /p:Exclude="$exclude" `
        /p:ExcludeByAttribute=$excludeByAttribute
}

function Invoke-CodeCoverageWithThreshold { 
    Remove-CodeCoverageOutput
    $files = Get-ChildItem -Path $Path -Recurse -Filter "*csproj"

    foreach ($file in $files) {
        Write-Host "Processing $file" -ForegroundColor Blue
        
            dotnet test $file --no-build --no-restore --filter $testFilter `
            --results-directory:$testResultsDir  --verbosity=minimal `
            /p:CollectCoverage=true `
            /p:CoverletOutput=$coverletJson `
            /p:MergeWith=$coverletJson `
            /p:VSTestUseMSBuildOutput=false `
            /p:IncludeTestAssembly=false `
            /p:Exclude="$exclude" `
            /p:ExcludeByAttribute=$excludeByAttribute

        if ($file -eq $files[-1]) {
            dotnet test $file --no-build --no-restore --filter $testFilter `
            --results-directory:$testResultsDir  --verbosity=minimal `
            /p:CollectCoverage=true `
            /p:Threshold=$threshold `
            /p:ThresholdType=$thresholdType `
            /p:ThresholdStat=$thresholdStat `
            /p:MergeWith=$coverletJson `
            /p:VSTestUseMSBuildOutput=false `
            /p:CoverletOutput=$coverletJson `
            /p:IncludeTestAssembly=false `
            /p:Exclude="$exclude" `
            /p:ExcludeByAttribute=$excludeByAttribute
        }
    }
}


function New-CodeCoverageReport {
    Invoke-CodeCoverage
    reportgenerator -reports:"..\**\coverage.cobertura.xml" -targetdir:"$coverageReportDir" -reporttypes:Html
}

function Remove-CodeCoverageOutput {
    $ErrorActionPreference = "Continue"
    Get-ChildItem -Include TestResults,TestCoverage,coverage.json,CoverageOutput.json,coverage.cobertura.xml,CoverageResults.json -Recurse -force `
        | Remove-Item -Force -Recurse

    $ErrorActionPreference = "Stop"
}

function Remove-BinAndObjDirectories {
    Get-ChildItem -include bin,obj -recurse | remove-item -force -recurse    
}