slowest-tests.php

#!/usr/bin/env php
<?php declare(strict_types=1);
namespace SebastianBergmann\SlowestTests;

use const STDERR;
use function array_filter;
use function array_slice;
use function array_sum;
use function array_values;
use function arsort;
use function count;
use function fwrite;
use function is_readable;
use function printf;
use DOMDocument;
use DOMXPath;

$args     = array_slice($argv, 1);
$showMean = false;

foreach ($args as $i => $arg) {
    if ($arg === '--mean') {
        $showMean = true;
        unset($args[$i]);
    }
}

$args = array_values($args);

if (count($args) !== 1) {
    fwrite(STDERR, "Usage: {$argv[0]} [--mean] <otr.xml>\n");

    exit(1);
}

$file = $args[0];

if (!is_readable($file)) {
    fwrite(STDERR, "Cannot read {$file}\n");

    exit(1);
}

$dom = new DOMDocument;
$dom->load($file);

$xpath = new DOMXPath($dom);
$xpath->registerNamespace('e', 'https://schemas.opentest4j.org/reporting/events/0.2.0');
$xpath->registerNamespace('phpunit', 'https://schema.phpunit.de/otr/phpunit/0.2.0');

$tests = [];

foreach ($xpath->query('//e:started[.//phpunit:methodSource]') as $started) {
    $id        = $started->getAttribute('id');
    $source    = $xpath->query('.//phpunit:methodSource', $started)->item(0);
    $className = $source->getAttribute('className');
    $name      = $started->getAttribute('name');

    $tests[$id] = $className . '::' . $name;
}

$runtimes = [];

foreach ($xpath->query('//e:finished') as $finished) {
    $id = $finished->getAttribute('id');

    if (!isset($tests[$id])) {
        continue;
    }

    $usage = $xpath->query('.//phpunit:resourceUsage', $finished)->item(0);

    if ($usage === null) {
        continue;
    }

    $runtimes[$tests[$id]] = (float) $usage->getAttribute('time');
}

if ($runtimes === []) {
    fwrite(STDERR, "No tests found in {$file}\n");

    exit(1);
}

arsort($runtimes);

if ($showMean) {
    $mean    = array_sum($runtimes) / count($runtimes);
    $slower  = array_filter($runtimes, static fn (float $t): bool => $t > $mean);
    $slowest = array_slice($slower, 0, 10, true);

    printf("Mean test runtime: %.6f s (%d tests, %d slower than mean)\n\n", $mean, count($runtimes), count($slower));
    printf("%-8s  %-8s  %s\n", 'Time(s)', 'x mean', 'Test');
    printf("%-8s  %-8s  %s\n", '-------', '------', '----');

    foreach ($slowest as $id => $time) {
        printf("%8.6f  %7.2fx  %s\n", $time, $time / $mean, $id);
    }

    exit;
}

$slowest = array_slice($runtimes, 0, 10, true);

printf("%-8s  %s\n", 'Time(s)', 'Test');
printf("%-8s  %s\n", '-------', '----');

foreach ($slowest as $id => $time) {
    printf("%8.6f  %s\n", $time, $id);
}