Enhance PHPUnit fixtures

.travis.yml

@@ -16,7 +16,7 @@ before_install:
   - phpenv config-rm xdebug.ini || echo "xdebug not available"
   - echo "memory_limit=-1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
   - export PATH="$PATH:$HOME/.composer/vendor/bin"
-  - wget -O phpunit.phar https://phar.phpunit.de/phpunit-6.5.phar
+  - wget -O phpunit.phar https://phar.phpunit.de/phpunit-7.5.phar
   - if [[ $coverage = 1 ]]; then mkdir -p build/logs; fi
   - if [[ $coverage = 1 ]]; then wget https://github.com/satooshi/php-coveralls/releases/download/v2.0.0/php-coveralls.phar; fi
   - if [[ $lint = 1 ]]; then wget https://github.com/FriendsOfPHP/PHP-CS-Fixer/releases/download/v2.10.0/php-cs-fixer.phar; fi

tests/AnnotationGenerator/ApiPlatformCoreAnnotationGeneratorTest.php

@@ -28,7 +28,7 @@ class ApiPlatformCoreAnnotationGeneratorTest extends TestCase
      */
     private $generator;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $graph = new \EasyRdf_Graph();
         $myEnum = new \EasyRdf_Resource('http://schema.org/MyEnum', $graph);

tests/Command/GenerateTypesCommandTest.php

@@ -28,7 +28,7 @@ class GenerateTypesCommandTest extends TestCase
      */
     private $fs;
 
-    public function setUp()
+    protected function setUp(): void
     {
         $this->fs = new Filesystem();
     }