Merge branch '3.4' into 4.1

* 3.4:
  [php_cs] disable fopen_flags
  [DI] fix error in dumped container
  [CS] Remove unused variables passed to closures
  [DI] fix dumping setters before their inlined instances
  [CS] Remove empty comment
  [CS] Enforces null type hint on last position in phpDocs
  [CS] Use combined assignment operators when possible
  Fix a typo in error messages
  Don't return early as this bypasses the auto exit feature
  [Console] Add missing null to input values allowed types
  [PHPUnitBridge] Fix microtime() format
  bumped Symfony version to 3.4.17
  updated VERSION for 3.4.16
  updated CHANGELOG for 3.4.16
  bumped Symfony version to 2.8.47
  update CONTRIBUTORS for 2.8.46
  updated VERSION for 2.8.46
  updated CHANGELOG for 2.8.46

Author: nicolas-grekas

ClockMock.php

@@ -66,7 +66,7 @@ public static function microtime($asFloat = false)
             return self::$now;
         }
 
-        return sprintf('%0.6f %d', self::$now - (int) self::$now, (int) self::$now);
+        return sprintf('%0.6f00 %d', self::$now - (int) self::$now, (int) self::$now);
     }
 
     public static function register($class)

Tests/ClockMockTest.php

@@ -0,0 +1,60 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bridge\PhpUnit\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bridge\PhpUnit\ClockMock;
+
+/**
+ * @author Dominic Tubach <[email protected]>
+ *
+ * @covers \Symfony\Bridge\PhpUnit\ClockMock
+ */
+class ClockMockTest extends TestCase
+{
+    public static function setUpBeforeClass()
+    {
+        ClockMock::register(__CLASS__);
+    }
+
+    protected function setUp()
+    {
+        ClockMock::withClockMock(1234567890.125);
+    }
+
+    public function testTime()
+    {
+        $this->assertSame(1234567890, time());
+    }
+
+    public function testSleep()
+    {
+        sleep(2);
+        $this->assertSame(1234567892, time());
+    }
+
+    public function testMicrotime()
+    {
+        $this->assertSame('0.12500000 1234567890', microtime());
+    }
+
+    public function testMicrotimeAsFloat()
+    {
+        $this->assertSame(1234567890.125, microtime(true));
+    }
+
+    public function testUsleep()
+    {
+        usleep(2);
+        $this->assertSame(1234567890.125002, microtime(true));
+    }
+}