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/TimeDataCollectorTest.php

@@ -0,0 +1,57 @@
+<?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\TimeDataCollector;
+use Symfony\Component\Stopwatch\Stopwatch;
+
+/**
+ * @group time-sensitive
+ */
+class TimeDataCollectorTest extends TestCase
+{
+    public function testCollect()
+    {
+        $c = new TimeDataCollector();
+
+        $request = new Request();
+        $request->server->set('REQUEST_TIME', 1);
+
+        $c->collect($request, new Response());
+
+        $this->assertEquals(0, $c->getStartTime());
+
+        $request->server->set('REQUEST_TIME_FLOAT', 2);
+
+        $c->collect($request, new Response());
+
+        $this->assertEquals(2000, $c->getStartTime());
+
+        $request = new Request();
+        $c->collect($request, new Response());
+        $this->assertEquals(0, $c->getStartTime());
+
+        $kernel = $this->getMockBuilder('Symfony\Component\HttpKernel\KernelInterface')->getMock();
+        $kernel->expects($this->once())->method('getStartTime')->willReturn(123456.0);
+
+        $c = new TimeDataCollector($kernel);
+        $request = new Request();
+        $request->server->set('REQUEST_TIME', 1);
+
+        $c->collect($request, new Response());
+        $this->assertEquals(123456000, $c->getStartTime());
+        $this->assertSame(class_exists(Stopwatch::class, false), $c->isStopwatchInstalled());
+    }
+}