Support PHPUnit 6

tests/Spout/Common/Helper/CellTypeHelperTest.php

@@ -2,10 +2,12 @@
 
 namespace Box\Spout\Common\Helper;
 
+use PHPUnit\Framework\TestCase;
+
 /**
  * Class CellTypeHelperTest
  */
-class CellTypeHelperTest extends \PHPUnit_Framework_TestCase
+class CellTypeHelperTest extends TestCase
 {
     /**
      * @return array

tests/Spout/Common/Helper/EncodingHelperTest.php

@@ -4,11 +4,12 @@ namespace Box\Spout\Common\Helper;
 
 use Box\Spout\Common\Exception\EncodingConversionException;
 use Box\Spout\TestUsingResource;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class EncodingHelperTest
  */
-class EncodingHelperTest extends \PHPUnit_Framework_TestCase
+class EncodingHelperTest extends TestCase
 {
     use TestUsingResource;
 

tests/Spout/Common/Helper/Escaper/ODSTest.php

@@ -3,11 +3,12 @@
 namespace Box\Spout\Common\Helper\Escaper;
 
 use Box\Spout\Common\Helper\Escaper;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class ODSTest
  */
-class ODSTest extends \PHPUnit_Framework_TestCase
+class ODSTest extends TestCase
 {
     /**
      * @return array

tests/Spout/Common/Helper/Escaper/XLSXTest.php

@@ -3,11 +3,12 @@
 namespace Box\Spout\Common\Helper\Escaper;
 
 use Box\Spout\Common\Helper\Escaper;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class XLSXTest
  */
-class XLSXTest extends \PHPUnit_Framework_TestCase
+class XLSXTest extends TestCase
 {
     /**
      * @return array

tests/Spout/Common/Helper/FileSystemHelperTest.php

@@ -3,11 +3,12 @@
 namespace Box\Spout\Common\Helper;
 
 use Box\Spout\Common\Exception\IOException;
+use PHPUnit\Framework\TestCase;
 
 /**
  * Class FileSystemHelperTest
  */
-class FileSystemHelperTest extends \PHPUnit_Framework_TestCase
+class FileSystemHelperTest extends TestCase
 {
     /** @var \Box\Spout\Writer\XLSX\Helper\FileSystemHelper */
     protected $fileSystemHelper;