minor #3111 Fix compatibility with PHPUnit 8 (jderusse)

This PR was merged into the 2.x branch.

Discussion
----------

Fix compatibility with PHPUnit 8

adds `: void` return typehint on methods `setup` and `teardown`

Commits
-------

f348f6ea Fix compatibility with PHPUnit 8

.travis.yml

@@ -5,10 +5,6 @@ cache:
         - vendor
         - $HOME/.composer/cache/files
 
-env:
-    global:
-        - SYMFONY_PHPUNIT_REMOVE_RETURN_TYPEHINT=1
-
 before_install:
     - phpenv config-rm xdebug.ini || return 0
 

tests/Cache/FilesystemTest.php

@@ -21,7 +21,7 @@ class FilesystemTest extends TestCase
     private $directory;
     private $cache;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $nonce = hash('sha256', uniqid(mt_rand(), true));
         $this->classname = '__Twig_Tests_Cache_FilesystemTest_Template_'.$nonce;
@@ -29,7 +29,7 @@ class FilesystemTest extends TestCase
         $this->cache = new FilesystemCache($this->directory);
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         if (file_exists($this->directory)) {
             FilesystemHelper::removeDir($this->directory);

tests/Extension/SandboxTest.php

@@ -28,7 +28,7 @@ class SandboxTest extends TestCase
     protected static $params;
     protected static $templates;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         self::$params = [
             'name' => 'Fabien',

tests/TokenStreamTest.php

@@ -20,7 +20,7 @@ class TokenStreamTest extends TestCase
 {
     protected static $tokens;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         self::$tokens = [
             new Token(Token::TEXT_TYPE, 1, 1),