Merge branch '4.4'

* 4.4:
  [Cache] fix cs
  Make tests support phpunit 8
  Allow Travis CI to build on PHP 7.4
  [DI] Allow dumping the container in one file instead of many files

Author: nicolas-grekas

Tests/ClockMockTest.php

@@ -13,6 +13,7 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\PhpUnit\ClockMock;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 
 /**
  * @author Dominic Tubach <[email protected]>
@@ -21,12 +22,14 @@
  */
 class ClockMockTest extends TestCase
 {
-    public static function setUpBeforeClass()
+    use ForwardCompatTestTrait;
+
+    private static function doSetUpBeforeClass()
     {
         ClockMock::register(__CLASS__);
     }
 
-    protected function setUp()
+    private function doSetUp()
     {
         ClockMock::withClockMock(1234567890.125);
     }

Tests/DnsMockTest.php

@@ -13,10 +13,13 @@
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\PhpUnit\DnsMock;
+use Symfony\Bridge\PhpUnit\ForwardCompatTestTrait;
 
 class DnsMockTest extends TestCase
 {
-    protected function tearDown()
+    use ForwardCompatTestTrait;
+
+    private function doTearDown()
     {
         DnsMock::withMockedHosts(array());
     }