Added Exception tests

Check if all exceptions implements ExceptionInteface - marker interface
for package-specific exceptions

Author: michalbundyra

src/Exception/InvalidConfigException.php

@@ -1,14 +1,14 @@
 <?php
 /**
  * @see       https://github.com/zendframework/zend-expressive-authentication for the canonical source repository
- * @copyright Copyright (c) 2017 Zend Technologies USA Inc. (https://www.zend.com)
+ * @copyright Copyright (c) 2017-2018 Zend Technologies USA Inc. (https://www.zend.com)
  * @license   https://github.com/zendframework/zend-expressive-authentication/blob/master/LICENSE.md New BSD License
  */
 
 declare(strict_types=1);
 
 namespace Zend\Expressive\Authentication\Exception;
 
-class InvalidConfigException extends RuntimeException implements ExceptionInterface
+class InvalidConfigException extends RuntimeException
 {
 }

src/Exception/RuntimeException.php

@@ -1,15 +1,14 @@
 <?php
 /**
  * @see       https://github.com/zendframework/zend-expressive-authentication for the canonical source repository
- * @copyright Copyright (c) 2017 Zend Technologies USA Inc. (https://www.zend.com)
+ * @copyright Copyright (c) 2017-2018 Zend Technologies USA Inc. (https://www.zend.com)
  * @license   https://github.com/zendframework/zend-expressive-authentication/blob/master/LICENSE.md New BSD License
  */
 
 declare(strict_types=1);
 
 namespace Zend\Expressive\Authentication\Exception;
 
-class RuntimeException extends \RuntimeException implements
-    ExceptionInterface
+class RuntimeException extends \RuntimeException implements ExceptionInterface
 {
 }

test/ExceptionTest.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * @see       https://github.com/zendframework/zend-expressive-authentication for the canonical source repository
+ * @copyright Copyright (c) 2018 Zend Technologies USA Inc. (https://www.zend.com)
+ * @license   https://github.com/zendframework/zend-expressive-authentication/blob/master/LICENSE.md New BSD License
+ */
+
+declare(strict_types=1);
+
+namespace ZendTest\Expressive\Authentication;
+
+use Generator;
+use PHPUnit\Framework\TestCase;
+use Psr\Container\ContainerExceptionInterface;
+use Zend\Expressive\Authentication\Exception\ExceptionInterface;
+
+class ExceptionTest extends TestCase
+{
+    public function exception() : Generator
+    {
+        $namespace = substr(ExceptionInterface::class, 0, strrpos(ExceptionInterface::class, '\\') + 1);
+
+        $exceptions = glob(__DIR__ . '/../src/Exception/*.php');
+        foreach ($exceptions as $exception) {
+            $class = substr(basename($exception), 0, -4);
+
+            yield $class => [$namespace . $class];
+        }
+    }
+
+    /**
+     * @dataProvider exception
+     */
+    public function testExceptionIsInstanceOfExceptionInterface(string $exception) : void
+    {
+        $this->assertContains('Exception', $exception);
+        $this->assertTrue(is_a($exception, ExceptionInterface::class, true));
+    }
+}