Fixed phpUnit test

phpunit.xml

@@ -7,7 +7,6 @@
          convertWarningsToExceptions="true"
          processIsolation="false"
          stopOnFailure="false"
-         syntaxCheck="false"
          bootstrap="./tests/bootstrap.php">
     <testsuites>
         <testsuite name="Default">

tests/ClassValidatorTest.php

@@ -3,8 +3,9 @@
 namespace CloudObjects\PhpMAE;
 
 use ML\IRI\IRI;
+use PHPUnit\Framework\TestCase;
 
-class ClassValidatorTest extends \PHPUnit_Framework_TestCase {
+class ClassValidatorTest extends TestCase {
 
     private $validator;
 
@@ -12,11 +13,12 @@ class ClassValidatorTest extends \PHPUnit_Framework_TestCase {
         return file_get_contents(__DIR__.'/fixtures/'.$filename);
     }
 
-    protected function setUp() {
+    protected function setUp(): void {
         $this->validator = new ClassValidator;
     }
 
     public function testValidate() {
+        $this->addToAssertionCount(1);
         $this->validator->validate($this->loadFromFile('class1.php'),
             new IRI('coid://example.com/TestClass1'));
     }