Add memory usage test for #48

Author: jwage

tests/Purl/Test/MemoryUsageTest.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Purl\Test;
+
+use PHPUnit\Framework\TestCase;
+use Purl\Url;
+use function floor;
+use function log;
+use function memory_get_usage;
+use function pow;
+use function round;
+
+class MemoryUsageTest extends TestCase
+{
+    public function testMemoryUsage() : void
+    {
+        $domains = [
+            'http://google.de',
+            'http://google.com',
+            'http://google.it',
+            'https://google.de',
+            'https://google.com',
+            'https://google.it',
+            'http://www.google.de',
+            'http://www.google.com',
+            'http://www.google.it',
+        ];
+
+        $memoryStart = memory_get_usage(true);
+
+        foreach ($domains as $key => $domain) {
+            $purl[$key] = Url::parse($domain);
+        }
+
+        $memoryEnd = memory_get_usage(true);
+
+        self::assertEquals($this->roundMemoryUsage($memoryStart), $this->roundMemoryUsage($memoryEnd));
+    }
+
+    private function roundMemoryUsage(float $size) : float
+    {
+        return round($size / pow(1024, $i = floor(log($size, 1024))));
+    }
+}