extend abstract class and testing

tests/Constraint/AbstractConstraintInstance.php

@@ -0,0 +1,16 @@
+<?php
+
+/*
+ * This file is part of composer/semver.
+ *
+ * (c) Composer <https://github.com/composer>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Composer\Semver\Constraint;
+
+class AbstractConstraintInstance extends AbstractConstraint
+{
+}

tests/Constraint/AbstractConstraintTest.php

@@ -19,14 +19,10 @@ class AbstractConstraintTest extends \PHPUnit_Framework_TestCase
     public function testAbstractConstraintWithDeprecated()
     {
         $expectedString = 'pretty string';
-        $constraint = new \ReflectionClass('\Composer\Semver\Constraint\AbstractConstraint');
-        $setPrettyString = $constraint->getMethod('setPrettyString');
-        $setPrettyString->setAccessible(true);
-        $setPrettyString->invoke($constraint, 'pretty string');
-
-        $getPrettyString = $constraint->getMethod('getPrettyString');
-        $getPrettyString->setAccessible(true);
-        $result = $setPrettyString->invoke($constraint);
+        $constraint = new AbstractConstraintInstance();
+
+        $constraint->setPrettyString('pretty-string');
+        $result = $constraint->getPrettyString();
 
         $this->assertSame($expectedString, $result);
     }