Add names to plugins & remove middleware interfaces.

Plugins do not have to implement the Application interfaces as they are
hook based plugins and not the same as applications.

While they could be the same, it doesn't make sense for plugins to add
themselves as a middleware layer when they have a middleware hook. The
Application adds itself as a middleware to ensure there is an 'end' to
the middleware queue and ensure that a response is always generated.

src/Core/PluginApp.php

@@ -13,16 +13,13 @@
  */
 namespace Cake\Core;
 
-use Psr\Http\Message\ResponseInterface;
-use Psr\Http\Message\ServerRequestInterface;
-
 /**
  * Base Plugin Class
  *
  * Every plugin should extends from this class or implement the interfaces and
  * include a plugin class in it's src root folder.
  */
-class PluginApp implements ConsoleApplicationInterface, HttpApplicationInterface, PluginInterface
+class PluginApp implements PluginInterface
 {
 
     /**
@@ -198,12 +195,4 @@ public function middleware($middleware)
     {
         return $middleware;
     }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, $next)
-    {
-        return $next($request, $response);
-    }
 }

tests/TestCase/Core/PluginAppTest.php

@@ -13,12 +13,16 @@
  */
 namespace Cake\Test\TestCase\Core;
 
+use Cake\Console\CommandCollection;
 use Cake\Core\Plugin;
 use Cake\Core\PluginApp;
+use Cake\Http\MiddlewareQueue;
 use Cake\TestSuite\TestCase;
+use Company\TestPluginThree\Plugin as TestPluginThree;
+use TestPlugin\Plugin as TestPlugin;
 
 /**
- * AppTest class
+ * PluginAppTest class
  */
 class PluginAppTest extends TestCase
 {
@@ -47,6 +51,29 @@ public function testConfigForRoutesAndBootstrap()
         ]);
 
         $this->assertFalse($plugin->isBootstrapEnabled());
-        $this->assertFalse($plugin->isRouteLoadingEnabled());
+        $this->assertFalse($plugin->isRoutesEnabled());
+    }
+
+    public function testGetName()
+    {
+        $plugin = new TestPlugin();
+        $this->assertSame('TestPlugin', $plugin->getName());
+
+        $plugin = new TestPluginThree();
+        $this->assertSame('Company/TestPluginThree', $plugin->getName());
+    }
+
+    public function testMiddleware()
+    {
+        $plugin = new PluginApp();
+        $middleware = new MiddlewareQueue();
+        $this->assertSame($middleware, $plugin->middleware($middleware));
+    }
+
+    public function testConsole()
+    {
+        $plugin = new PluginApp();
+        $commands = new CommandCollection();
+        $this->assertSame($commands, $plugin->console($commands));
     }
 }