Added a very basic omni test as we didn't cover it previously

tests/GeoIP2/Test/WebService/ClientTest.php

@@ -141,6 +141,21 @@ class ClientTest extends \PHPUnit_Framework_TestCase
         );
     }
 
+
+    public function testOmni()
+    {
+        $omni = $this->client($this->getResponse('1.2.3.10'))
+            ->omni('1.2.3.10');
+
+        $this->assertInstanceOf('GeoIP2\Model\Omni', $omni);
+
+        $this->assertEquals(
+            42,
+            $omni->continent->geonameId,
+            'continent geoname_id is 42'
+        );
+    }
+
     public function testMe()
     {
         $client = $this->client($this->getResponse('me'));