Compatibility with recent PHPUnit (8)

tests/Token/ClassTest.php

@@ -22,7 +22,7 @@ class PHP_Token_ClassTest extends TestCase
      */
     private $function;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         foreach (new PHP_Token_Stream(TEST_FILES_PATH . 'source2.php') as $token) {
             if ($token instanceof PHP_Token_CLASS) {

tests/Token/ClosureTest.php

@@ -17,7 +17,7 @@ class PHP_Token_ClosureTest extends TestCase
      */
     private $functions;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         foreach (new PHP_Token_Stream(TEST_FILES_PATH . 'closure.php') as $token) {
             if ($token instanceof PHP_Token_FUNCTION) {

tests/Token/FunctionTest.php

@@ -17,7 +17,7 @@ class PHP_Token_FunctionTest extends TestCase
      */
     private $functions;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         foreach (new PHP_Token_Stream(TEST_FILES_PATH . 'source.php') as $token) {
             if ($token instanceof PHP_Token_FUNCTION) {

tests/Token/IncludeTest.php

@@ -17,7 +17,7 @@ class PHP_Token_IncludeTest extends TestCase
      */
     private $ts;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->ts = new PHP_Token_Stream(TEST_FILES_PATH . 'source3.php');
     }

tests/Token/InterfaceTest.php

@@ -22,7 +22,7 @@ class PHP_Token_InterfaceTest extends TestCase
      */
     private $interfaces;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $ts = new PHP_Token_Stream(TEST_FILES_PATH . 'source4.php');
         $i  = 0;