diff --git a/src/Phpml/Exception/NormalizerException.php b/src/Phpml/Exception/NormalizerException.php
index d1b689a..9f88f0c 100644
--- a/src/Phpml/Exception/NormalizerException.php
+++ b/src/Phpml/Exception/NormalizerException.php
@@ -13,5 +13,4 @@ class NormalizerException extends \Exception
     {
         return new self('Unknown norm supplied.');
     }
-    
 }
diff --git a/tests/Phpml/Clustering/KMeansTest.php b/tests/Phpml/Clustering/KMeansTest.php
index 5a85b38..79b5ce7 100644
--- a/tests/Phpml/Clustering/KMeansTest.php
+++ b/tests/Phpml/Clustering/KMeansTest.php
@@ -48,4 +48,12 @@ class KMeansTest extends \PHPUnit_Framework_TestCase
         $clusters = $kmeans->cluster($samples);
         $this->assertEquals(4, count($clusters));
     }
+
+    /**
+     * @expectedException \Phpml\Exception\InvalidArgumentException
+     */
+    public function testThrowExceptionOnInvalidClusterNumber()
+    {
+        new KMeans(0);
+    }
 }