Update to PHPUnit namespaces

Author: peterrehm

Tests/DumperTest.php

@@ -11,10 +11,11 @@
 
 namespace Symfony\Component\Yaml\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Yaml\Parser;
 use Symfony\Component\Yaml\Dumper;
 
-class DumperTest extends \PHPUnit_Framework_TestCase
+class DumperTest extends TestCase
 {
     protected $parser;
     protected $dumper;

Tests/InlineTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Component\Yaml\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Yaml\Inline;
 
-class InlineTest extends \PHPUnit_Framework_TestCase
+class InlineTest extends TestCase
 {
     /**
      * @dataProvider getTestsForParse

Tests/ParseExceptionTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Component\Yaml\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Yaml\Exception\ParseException;
 
-class ParseExceptionTest extends \PHPUnit_Framework_TestCase
+class ParseExceptionTest extends TestCase
 {
     public function testGetMessage()
     {

Tests/ParserTest.php

@@ -11,10 +11,11 @@
 
 namespace Symfony\Component\Yaml\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Yaml\Yaml;
 use Symfony\Component\Yaml\Parser;
 
-class ParserTest extends \PHPUnit_Framework_TestCase
+class ParserTest extends TestCase
 {
     protected $parser;
 

Tests/YamlTest.php

@@ -11,9 +11,10 @@
 
 namespace Symfony\Component\Yaml\Tests;
 
+use PHPUnit\Framework\TestCase;
 use Symfony\Component\Yaml\Yaml;
 
-class YamlTest extends \PHPUnit_Framework_TestCase
+class YamlTest extends TestCase
 {
     public function testParseAndDump()
     {