Created tests for QrCode middlewares

module/Core/test/Middleware/QrCodeCacheMiddlewareTest.php

@@ -0,0 +1,69 @@
+<?php
+namespace ShlinkioTest\Shlink\Core\Middleware;
+
+use Doctrine\Common\Cache\ArrayCache;
+use Doctrine\Common\Cache\Cache;
+use PHPUnit_Framework_TestCase as TestCase;
+use Shlinkio\Shlink\Core\Middleware\QrCodeCacheMiddleware;
+use Zend\Diactoros\Response;
+use Zend\Diactoros\ServerRequestFactory;
+use Zend\Diactoros\Uri;
+
+class QrCodeCacheMiddlewareTest extends TestCase
+{
+    /**
+     * @var QrCodeCacheMiddleware
+     */
+    protected $middleware;
+    /**
+     * @var Cache
+     */
+    protected $cache;
+
+    public function setUp()
+    {
+        $this->cache = new ArrayCache();
+        $this->middleware = new QrCodeCacheMiddleware($this->cache);
+    }
+
+    /**
+     * @test
+     */
+    public function noCachedPathFallbacksToNextMiddleware()
+    {
+        $isCalled = false;
+        $this->middleware->__invoke(
+            ServerRequestFactory::fromGlobals(),
+            new Response(),
+            function ($req, $resp) use (&$isCalled) {
+                $isCalled = true;
+                return $resp;
+            }
+        );
+        $this->assertTrue($isCalled);
+    }
+
+    /**
+     * @test
+     */
+    public function cachedPathReturnsCacheContent()
+    {
+        $isCalled = false;
+        $uri = (new Uri())->withPath('/foo');
+        $this->cache->save('/foo', ['body' => 'the body', 'content-type' => 'image/png']);
+
+        $resp = $this->middleware->__invoke(
+            ServerRequestFactory::fromGlobals()->withUri($uri),
+            new Response(),
+            function ($req, $resp) use (&$isCalled) {
+                $isCalled = true;
+                return $resp;
+            }
+        );
+
+        $this->assertFalse($isCalled);
+        $resp->getBody()->rewind();
+        $this->assertEquals('the body', $resp->getBody()->getContents());
+        $this->assertEquals('image/png', $resp->getHeaderLine('Content-Type'));
+    }
+}