N°2651 rollback gitignore for lib tests dirs

Too dangerous ! We'll work properly on this but for 2.8

lib/symfony/http-kernel/Tests/DataCollector/MemoryDataCollectorTest.php

@@ -0,0 +1,59 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Tests\DataCollector;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\DataCollector\MemoryDataCollector;
+
+class MemoryDataCollectorTest extends TestCase
+{
+    public function testCollect()
+    {
+        $collector = new MemoryDataCollector();
+        $collector->collect(new Request(), new Response());
+
+        $this->assertIsInt($collector->getMemory());
+        $this->assertIsInt($collector->getMemoryLimit());
+        $this->assertSame('memory', $collector->getName());
+    }
+
+    /** @dataProvider getBytesConversionTestData */
+    public function testBytesConversion($limit, $bytes)
+    {
+        $collector = new MemoryDataCollector();
+        $method = new \ReflectionMethod($collector, 'convertToBytes');
+        $method->setAccessible(true);
+        $this->assertEquals($bytes, $method->invoke($collector, $limit));
+    }
+
+    public function getBytesConversionTestData()
+    {
+        return [
+            ['2k', 2048],
+            ['2 k', 2048],
+            ['8m', 8 * 1024 * 1024],
+            ['+2 k', 2048],
+            ['+2???k', 2048],
+            ['0x10', 16],
+            ['0xf', 15],
+            ['010', 8],
+            ['+0x10 k', 16 * 1024],
+            ['1g', 1024 * 1024 * 1024],
+            ['1G', 1024 * 1024 * 1024],
+            ['-1', -1],
+            ['0', 0],
+            ['2mk', 2048], // the unit must be the last char, so in this case 'k', not 'm'
+        ];
+    }
+}