Compare CC in Pester

run.ps1

$c = New-PesterConfiguration

# your Path
$c.Run.Path = "."
$c.Run.PassThru = $true

# detailed prints the CC report, but that is very verbose
# use only for tiny codebases
# $c.Output.Verbosity = "Detailed"

# optional, slows down the execution a lot on bigger runs
# $c.Debug.WriteDebugMessages = $true
# $c.Debug.WriteDebugMessagesFrom = "CodeCoverage"

$c.CodeCoverage.Enabled = $true
# makes it easier to visualize this in VSCode, if this fails
# comment this line out to use Jacoco
$c.CodeCoverage.OutputFormat = "CoverageGutters"

# use tracer CC
$c.CodeCoverage.UseBreakpoints = $false
$c.CodeCoverage.OutputPath = "coverage-with-tracer.xml"
$pp = Invoke-Pester -Configuration $c

# # use normal CC
$c.CodeCoverage.UseBreakpoints = $true
$c.CodeCoverage.OutputPath = "coverage-with-breakpoints.xml"
$bb = Invoke-Pester -Configuration $c

# compare the outputs
"is different?: " + ($bb.CodeCoverage.CommandsMissed.Count -ne $pp.CodeCoverage.CommandsMissed.Count)
"is less?: " + ($bb.CodeCoverage.CommandsMissed.Count -lt $pp.CodeCoverage.CommandsMissed.Count)

$bm =  $bb.CodeCoverage.CommandsMissed
$pm =  $pp.CodeCoverage.CommandsMissed

$m = $bm | foreach { $h = @{} } { $h["$($_.File)-$($_.Line)-$($_.StartColumn)"] = $_ } { $h }

$diff = $pm | where { -not $m.ContainsKey("$($_.File)-$($_.Line)-$($_.StartColumn)") }

"difference count?: " + $diff.Count
$diff | ft

yesno.ps1

function a () {
    if ($true) {
        "yes"
        $a = 10
    }
    else {
        "no"
    }
}

yesno.Tests.ps1

Describe "A" {
    BeforeAll {
        . "$PSScriptRoot/yesno.ps1"
    }
    It "B" {
        a
    }
}