Merge branch 'dopesong-abstract-handler-phpunit' into 3.x

Closes #1876

tests/Handlers/AbstractHandlerTest.php

@@ -0,0 +1,30 @@
+<?php
+/**
+ * Slim Framework (http://slimframework.com)
+ *
+ * @link      https://github.com/slimphp/Slim
+ * @copyright Copyright (c) 2011-2016 Josh Lockhart
+ * @license   https://github.com/slimphp/Slim/blob/master/LICENSE.md (MIT License)
+ */
+namespace Slim\Tests\Handlers;
+
+use Slim\Handlers\AbstractHandler;
+
+class AbstractHandlerTest extends \PHPUnit_Framework_TestCase
+{
+    public function testHalfValidContentType()
+    {
+        $req = $this->getMockBuilder('Slim\Http\Request')->disableOriginalConstructor()->getMock();
+        $req->expects($this->any())->method('getHeaderLine')->will($this->returnValue('unknown/json'));
+
+        $abstractHandler = $this->getMockForAbstractClass(AbstractHandler::class);
+
+        $class = new \ReflectionClass(AbstractHandler::class);
+        $method = $class->getMethod('determineContentType');
+        $method->setAccessible(true);
+
+        $return = $method->invoke($abstractHandler, $req);
+
+        $this->assertEquals('text/html', $return);
+    }
+}