Support PHPUnit 6

tests/Spout/Writer/Common/Creator/StyleBuilderTest.php

@@ -5,11 +5,12 @@ namespace Box\Spout\Writer\Common\Creator\Style;
 use Box\Spout\Common\Entity\Style\Border;
 use Box\Spout\Common\Entity\Style\Color;
 use Box\Spout\Writer\Common\Manager\Style\StyleMerger;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class StyleManagerTest
  */
-class StyleBuilderTest extends \PHPUnit_Framework_TestCase
+class StyleBuilderTest extends TestCase
 {
     /**
      * @return void

tests/Spout/Writer/Common/Creator/WriterFactoryTest.php

@@ -3,11 +3,12 @@
 namespace Box\Spout\Writer\Common\Creator;
 
 use Box\Spout\Common\Exception\UnsupportedTypeException;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class WriterFactoryTest
  */
-class WriterFactoryTest extends \PHPUnit_Framework_TestCase
+class WriterFactoryTest extends TestCase
 {
     /**
      * @return void