Add tests for Callback middleware (#113)

tests/Middleware/CallbackTest.php

@@ -0,0 +1,101 @@
+<?php
+
+namespace Yiisoft\Yii\Web\Tests\Middleware;
+
+use Nyholm\Psr7\Response;
+use Nyholm\Psr7\ServerRequest;
+use PHPUnit\Framework\TestCase;
+use Psr\Container\ContainerInterface;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Psr\Http\Server\RequestHandlerInterface;
+use Yiisoft\Router\Method;
+use Yiisoft\Yii\Web\Middleware\Callback;
+
+final class CallbackTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function handlerIsPassedToCallback()
+    {
+        $middleware = new Callback(function (ServerRequestInterface $request, RequestHandlerInterface $handler) {
+            return $handler->handle($request);
+        }, $this->createContainer());
+
+        $response = $middleware->process($this->createRequest(), $this->createRequestHandler());
+        $this->assertEquals(200, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function callbackResultReturned()
+    {
+        $middleware = new Callback(function () {
+            return new Response(400);
+        }, $this->createContainer());
+
+        $response = $middleware->process($this->createRequest(), $this->createRequestHandler());
+        $this->assertEquals(400, $response->getStatusCode());
+    }
+
+    /**
+     * @test
+     */
+    public function requestIsPassedToCallback()
+    {
+        $requestMethod = Method::PUT;
+        $requestUri = '/test/request/uri';
+        $middleware = new Callback(function (ServerRequestInterface $request, RequestHandlerInterface $handler) use ($requestMethod, $requestUri) {
+            $this->assertEquals($request->getMethod(), $requestMethod);
+            $this->assertEquals($request->getUri(), $requestUri);
+            return $handler->handle($request);
+        }, $this->createContainer());
+
+        $middleware->process($this->createRequest($requestMethod, $requestUri), $this->createRequestHandler());
+    }
+
+    /**
+     * @test
+     */
+    public function checkDiContainerCalled()
+    {
+        $middleware = new Callback(function (Response $response) {
+            return $response;
+        }, $this->createContainer());
+
+        $response = $middleware->process($this->createRequest(), $this->createRequestHandler());
+        $this->assertEquals(404, $response->getStatusCode());
+    }
+
+    private function createContainer(): ContainerInterface
+    {
+        return new class implements ContainerInterface {
+            public function get($id)
+            {
+                return new Response(404);
+            }
+
+            public function has($id)
+            {
+                // do nothing
+            }
+        };
+    }
+
+    private function createRequestHandler(): RequestHandlerInterface
+    {
+        return new class implements RequestHandlerInterface {
+            public function handle(ServerRequestInterface $request): ResponseInterface
+            {
+                return new Response(200);
+            }
+        };
+    }
+
+    private function createRequest(string $method = Method::GET, string $uri = '/'): ServerRequestInterface
+    {
+        return new ServerRequest($method, $uri);
+    }
+}