diff --git a/tests/HeaderCacheControlTest.php b/tests/HeaderCacheControlTest.php
index e8495cc4..879cd2fa 100644
--- a/tests/HeaderCacheControlTest.php
+++ b/tests/HeaderCacheControlTest.php
@@ -32,6 +32,11 @@ public function setUp()
                         (new Response())
                             ->withAddedHeader("Cache-Control", "max-age=2")
                     );
+                case '/2s-complex':
+                    return new FulfilledPromise(
+                        (new Response())
+                            ->withAddedHeader("Cache-Control", "invalid-token =\"yes\", max-age=2, stale-while-revalidate= 60")
+                    );
                 case '/no-store':
                     return new FulfilledPromise(
                         (new Response())
@@ -72,6 +77,19 @@ public function testMaxAgeHeader()
         $this->assertEquals(CacheMiddleware::HEADER_CACHE_MISS, $response->getHeaderLine(CacheMiddleware::HEADER_CACHE_INFO));
     }
 
+    public function testMaxAgeComplexHeader()
+    {
+        $this->client->get("http://test.com/2s-complex");
+
+        $response = $this->client->get("http://test.com/2s-complex");
+        $this->assertEquals(CacheMiddleware::HEADER_CACHE_HIT, $response->getHeaderLine(CacheMiddleware::HEADER_CACHE_INFO));
+
+        sleep(3);
+
+        $response = $this->client->get("http://test.com/2s-complex");
+        $this->assertEquals(CacheMiddleware::HEADER_CACHE_MISS, $response->getHeaderLine(CacheMiddleware::HEADER_CACHE_INFO));
+    }
+
     public function testNoStoreHeader()
     {
         $this->client->get("http://test.com/no-store");
@@ -88,4 +106,4 @@ public function testNoCacheHeader()
         $this->assertEquals(CacheMiddleware::HEADER_CACHE_HIT, $response->getHeaderLine(CacheMiddleware::HEADER_CACHE_INFO));
     }
 
-}
\ No newline at end of file
+}