Update Asset view helper tests to PHPUnit 5.7/6.0

- Use namespaced version of `PHPUnit\Framework\TestCase`
- Convert `setExpectedException()` calls to `expectException()` +
  `expectExceptionMessage()`.

Author: weierophinney

test/Helper/AssetTest.php

@@ -7,7 +7,7 @@
 
 namespace ZendTest\View\Helper;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Zend\ServiceManager\ServiceManager;
 use Zend\View\Exception;
 use Zend\View\Helper\Asset;
@@ -50,7 +50,8 @@ public function testHelperPluginManagerReturnsAssetHelperByClassName()
 
     public function testInvalidAssetName()
     {
-        $this->setExpectedException(Exception\InvalidArgumentException::class, 'Asset is not defined.');
+        $this->expectException(Exception\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Asset is not defined');
 
         $this->asset->__invoke('unknown');
     }

test/Helper/Service/AssetFactoryTest.php

@@ -7,7 +7,7 @@
 
 namespace ZendTest\View\Helper\Service;
 
-use PHPUnit_Framework_TestCase as TestCase;
+use PHPUnit\Framework\TestCase;
 use Zend\ServiceManager\ServiceManager;
 use Zend\View\Exception;
 use Zend\View\Helper\Asset;
@@ -68,7 +68,8 @@ public function testInvalidConfiguration()
 
         $assetFactory = new AssetFactory();
 
-        $this->setExpectedException(Exception\RuntimeException::class, 'Invalid resource map configuration.');
+        $this->expectException(Exception\RuntimeException::class);
+        $this->expectExceptionMessage('Invalid resource map configuration');
         $assetFactory($services, '');
     }