Modernize tests

Author: fabpot

src/Pimple/Tests/PimpleServiceProviderInterfaceTest.php

@@ -27,11 +27,12 @@
 namespace Pimple\Tests;
 
 use Pimple\Container;
+use PHPUnit\Framework\TestCase;
 
 /**
  * @author Dominik Zogg <dominik.zogg@gmail.com>
  */
-class PimpleServiceProviderInterfaceTest extends \PHPUnit_Framework_TestCase
+class PimpleServiceProviderInterfaceTest extends TestCase
 {
     public function testProvider()
     {

src/Pimple/Tests/PimpleTest.php

@@ -27,11 +27,12 @@
 namespace Pimple\Tests;
 
 use Pimple\Container;
+use PHPUnit\Framework\TestCase;
 
 /**
  * @author Igor Wiedler <igor@wiedler.ch>
  */
-class PimpleTest extends \PHPUnit_Framework_TestCase
+class PimpleTest extends TestCase
 {
     public function testWithString()
     {