Powershell Run a Command And Count Errors

RunCommandAndCountErrors.ps1

# Run command and count errors
# I use this to gather statistics about flaky tests:
# 
# > RunCommandAndCountErrors "python -mpytest -ktest_some_flaky_test .\test_tests.py" 10
# ...
# ...
# Test 10, nofErrors: 3
# Nof test runs: 10, nof errors: 3
# > _
function RunCommandAndCountErrors($cmd, $reps)
{
    $nofErrors = 0
    $cnt = 0
    for ($i = 1; $i -le $reps; $i++) {
        Invoke-Expression $cmd  
        $ec = $LASTEXITCODE
        write-host "Last exit code: $ec"
        $cnt++
        if ($ec -ne 0) {
            $nofErrors++    
            write-host "Increasing nofErrors: $nofErrors"
        }
        write-host "Test $cnt of $reps, nofErrors: $nofErrors"
    }
    write-host "Nof test runs: $cnt, nof errors: $nofErrors"
}