Simple script which attempts to count the hard coded Test Doubles used by a PHPUnit test suite.

test-double-counter.php

<?php

/**
 * Purpose of the exercise is to analyse test case files. Any classes defined
 * therein in addition to the actual test case class is assumed to be a
 * hard coded Test Double. Now, where's my pinch of salt...
 *
 * Script's sole argument is the path (to a test directory) to analyse.
 */

$classCount = 0;
$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($argv[1]));
foreach ($iterator as $file) {
    $localClassCount = 0;
    if ($file->isDir()) continue;
    if (!preg_match("/\.php$/", $file->getFilename())) continue;
    $tokens = token_get_all(file_get_contents($file->getRealPath()));
    foreach ($tokens as $index=>$token) {
        if (!is_array($token)) continue;
        if ($token[0] === T_CLASS) {
            $localClassCount++;
            continue;
        }
        /**
         * Sweet chaos. We track forward to first curly bracket, then track back
         * to find last element of a possibly namespaced class name. If the last
         * element ends in Test, or includes PHPUnit, we assume it's a TestCase
         * and not a Test Double. Will need to be revised for PHPUnit 4
         */
        if ($token[0] === T_EXTENDS) {
            $i = $index++;
            while (true) {
                if (is_array($tokens[$i])) $i++;
                if (!is_array($tokens[$i])) break;
            }
            while (true) {
                if (!is_array($tokens[$i])) {
                    $i--; continue;
                }
                if ($tokens[$i][0] === T_EXTENDS) break;
                if ($tokens[$i][1] == '\\') break;
                if (preg_match("/PHPUnit/i", $tokens[$i][1])
                || preg_match("/Test$/i", $tokens[$i][1])) {
                    $localClassCount--;
                    break;
                }
                $i--;
            }
        }
    }
    $classCount += $localClassCount;
    if ($localClassCount) echo $localClassCount, ' ', $file->getPathname(), PHP_EOL;
}
echo PHP_EOL, 'Approximate Test Doubles: ', $classCount, PHP_EOL;