diff --git a/src/Mailgun/Model/Message/ShowResponse.php b/src/Mailgun/Model/Message/ShowResponse.php
index 45e0926..1a1a553 100644
--- a/src/Mailgun/Model/Message/ShowResponse.php
+++ b/src/Mailgun/Model/Message/ShowResponse.php
@@ -105,7 +105,7 @@ class ShowResponse implements ApiResponse
     /**
      * @param array $data
      *
-     * @return SendResponse
+     * @return ShowResponse
      */
     public static function create(array $data)
     {
diff --git a/src/Mailgun/Model/Tag/Tag.php b/src/Mailgun/Model/Tag/Tag.php
index 34a6bac..1a88ff5 100644
--- a/src/Mailgun/Model/Tag/Tag.php
+++ b/src/Mailgun/Model/Tag/Tag.php
@@ -37,7 +37,7 @@ class Tag
      * @param \DateTime $firstSeen
      * @param \DateTime $lastSeen
      */
-    public function __construct($tag, $description, \DateTime $firstSeen, \DateTime $lastSeen)
+    public function __construct($tag, $description, \DateTime $firstSeen = null, \DateTime $lastSeen = null)
     {
         $this->tag = $tag;
         $this->description = $description;
@@ -52,7 +52,10 @@ class Tag
      */
     public static function create(array $data)
     {
-        return new self($data['tag'], $data['description'], new \DateTime($data['first-seen']), new \DateTime($data['last-seen']));
+        $firstSeen = isset($data['first-seen']) ? new \DateTime($data['first-seen']) : null;
+        $lastSeen = isset($data['last-seen']) ? new \DateTime($data['last-seen']) : null;
+
+        return new self($data['tag'], $data['description'], $firstSeen, $lastSeen);
     }
 
     /**
diff --git a/tests/Model/Event/EventResponseTest.php b/tests/Model/Event/EventResponseTest.php
new file mode 100644
index 0000000..8f75f33
--- /dev/null
+++ b/tests/Model/Event/EventResponseTest.php
@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * Copyright (C) 2013 Mailgun
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license. See the LICENSE file for details.
+ */
+
+namespace Mailgun\Tests\Model\Event;
+
+use Mailgun\Model\Event\EventResponse;
+use Mailgun\Tests\Model\BaseModelTest;
+
+class EventResponseTest extends BaseModelTest
+{
+    public function testCreate()
+    {
+        $json =
+<<<'JSON'
+{
+  "items": [
+    {
+      "tags": [],
+      "id": "czsjqFATSlC3QtAK-C80nw",
+      "timestamp": 1376325780.160809,
+      "envelope": {
+        "sender": "me@samples.mailgun.org",
+        "transport": ""
+      },
+      "event": "accepted",
+      "campaigns": [],
+      "user-variables": {},
+      "flags": {
+        "is-authenticated": true,
+        "is-test-mode": false
+      },
+      "message": {
+        "headers": {
+          "to": "foo@example.com",
+          "message-id": "20130812164300.28108.52546@samples.mailgun.org",
+          "from": "Excited User <me@samples.mailgun.org>",
+          "subject": "Hello"
+        },
+        "attachments": [],
+        "recipients": [
+          "foo@example.com",
+          "baz@example.com",
+          "bar@example.com"
+        ],
+        "size": 69
+      },
+      "recipient": "baz@example.com",
+      "method": "http"
+    }
+  ],
+  "paging": {
+    "next":
+        "https://api.mailgun.net/v3/samples.mailgun.org/events/W3siY",
+    "previous":
+        "https://api.mailgun.net/v3/samples.mailgun.org/events/Lkawm"
+  }
+}
+JSON;
+        $model = EventResponse::create(json_decode($json, true));
+        $events = $model->getItems();
+        $this->assertCount(1, $events);
+        $event = $events[0];
+        $this->assertEquals('czsjqFATSlC3QtAK-C80nw', $event->getId());
+    }
+}
diff --git a/tests/Model/Message/SendResponseTest.php b/tests/Model/Message/SendResponseTest.php
new file mode 100644
index 0000000..32cbffe
--- /dev/null
+++ b/tests/Model/Message/SendResponseTest.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * Copyright (C) 2013 Mailgun
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license. See the LICENSE file for details.
+ */
+
+namespace Mailgun\Tests\Model\Message;
+
+use Mailgun\Model\Message\SendResponse;
+use Mailgun\Tests\Model\BaseModelTest;
+
+class SendResponseTest extends BaseModelTest
+{
+    public function testCreate()
+    {
+        $json =
+<<<'JSON'
+{
+  "message": "Queued. Thank you.",
+  "id": "<20111114174239.25659.5817@samples.mailgun.org>"
+}
+JSON;
+        $model = SendResponse::create(json_decode($json, true));
+        $this->assertEquals('<20111114174239.25659.5817@samples.mailgun.org>', $model->getId());
+        $this->assertEquals('Queued. Thank you.', $model->getMessage());
+    }
+}
diff --git a/tests/Model/Route/CreateResponseTest.php b/tests/Model/Route/CreateResponseTest.php
new file mode 100644
index 0000000..b08fa5c
--- /dev/null
+++ b/tests/Model/Route/CreateResponseTest.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * Copyright (C) 2013 Mailgun
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license. See the LICENSE file for details.
+ */
+
+namespace Mailgun\Tests\Model\Route;
+
+use Mailgun\Model\Route\Response\CreateResponse;
+use Mailgun\Tests\Model\BaseModelTest;
+
+class CreateResponseTest extends BaseModelTest
+{
+    public function testCreate()
+    {
+        $json =
+<<<'JSON'
+{
+  "message": "Route has been created",
+  "route": {
+      "description": "Sample route",
+      "created_at": "Wed, 15 Feb 2012 13:03:31 GMT",
+      "actions": [
+          "forward(\"http://myhost.com/messages/\")",
+          "stop()"
+      ],
+      "priority": 0,
+      "expression": "match_recipient(\".*@samples.mailgun.org\")",
+      "id": "4f3bad2335335426750048c6"
+  }
+}
+JSON;
+        $model = CreateResponse::create(json_decode($json, true));
+
+        $this->assertEquals('Route has been created', $model->getMessage());
+        $route = $model->getRoute();
+        $this->assertEquals('Sample route', $route->getDescription());
+    }
+}
diff --git a/tests/Model/Route/IndexResponseTest.php b/tests/Model/Route/IndexResponseTest.php
new file mode 100644
index 0000000..c4826eb
--- /dev/null
+++ b/tests/Model/Route/IndexResponseTest.php
@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * Copyright (C) 2013 Mailgun
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license. See the LICENSE file for details.
+ */
+
+namespace Mailgun\Tests\Model\Route;
+
+use Mailgun\Model\Route\Response\IndexResponse;
+use Mailgun\Tests\Model\BaseModelTest;
+
+class IndexResponseTest extends BaseModelTest
+{
+    public function testCreate()
+    {
+        $json =
+<<<'JSON'
+{
+  "total_count": 266,
+  "items": [
+      {
+          "description": "Sample route",
+          "created_at": "Wed, 15 Feb 2012 12:58:12 GMT",
+          "actions": [
+              "forward(\"http://myhost.com/messages/\")",
+              "stop()"
+          ],
+          "priority": 0,
+          "expression": "match_recipient(\".*@samples.mailgun.org\")",
+          "id": "4f3babe4ba8a481c6400476a"
+      }
+  ]
+}
+JSON;
+        $model = IndexResponse::create(json_decode($json, true));
+
+        $this->assertEquals('266', $model->getTotalCount());
+        $routes = $model->getRoutes();
+        $this->assertCount(1, $routes);
+        $route = $routes[0];
+        $this->assertEquals('Sample route', $route->getDescription());
+    }
+}
diff --git a/tests/Model/Route/ShowResponseTest.php b/tests/Model/Route/ShowResponseTest.php
new file mode 100644
index 0000000..8f9ac4f
--- /dev/null
+++ b/tests/Model/Route/ShowResponseTest.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * Copyright (C) 2013 Mailgun
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license. See the LICENSE file for details.
+ */
+
+namespace Mailgun\Tests\Model\Route;
+
+use Mailgun\Model\Route\Response\ShowResponse;
+use Mailgun\Tests\Model\BaseModelTest;
+
+class ShowResponseTest extends BaseModelTest
+{
+    public function testCreate()
+    {
+        $json =
+<<<'JSON'
+{
+  "route": {
+      "description": "Sample route",
+      "created_at": "Wed, 15 Feb 2012 13:03:31 GMT",
+      "actions": [
+          "forward(\"http://myhost.com/messages/\")",
+          "stop()"
+      ],
+      "priority": 0,
+      "expression": "match_recipient(\".*@samples.mailgun.org\")",
+      "id": "4f3bad2335335426750048c6"
+  }
+}
+JSON;
+        $model = ShowResponse::create(json_decode($json, true));
+        $this->assertEquals('Sample route', $model->getRoute()->getDescription());
+    }
+}
diff --git a/tests/Model/Tag/IndexResponseTest.php b/tests/Model/Tag/IndexResponseTest.php
new file mode 100644
index 0000000..4f81efc
--- /dev/null
+++ b/tests/Model/Tag/IndexResponseTest.php
@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * Copyright (C) 2013 Mailgun
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license. See the LICENSE file for details.
+ */
+
+namespace Mailgun\Tests\Model\Tag;
+
+use Mailgun\Model\Tag\IndexResponse;
+use Mailgun\Tests\Model\BaseModelTest;
+
+class IndexResponseTest extends BaseModelTest
+{
+    public function testCreate()
+    {
+        $json =
+<<<'JSON'
+{
+  "items": [
+      {
+        "tag": "red",
+        "description": "red signup button"
+      },
+      {
+        "tag": "green",
+        "description": "green signup button"
+      }
+  ],
+  "paging": {
+    "next":
+        "https://url_to_next_page",
+    "previous":
+        "https://url_to_previous_page",
+    "first":
+        "https://url_to_first_page",
+    "last":
+        "https://url_to_last_page"
+  }
+}
+JSON;
+        $model = IndexResponse::create(json_decode($json, true));
+
+        $tags = $model->getItems();
+        $this->assertCount(2, $tags);
+        $tag = $tags[0];
+        $this->assertEquals('red', $tag->getTag());
+    }
+}