diff --git a/Aggregation/CardinalityAggregationTest.php b/Aggregation/CardinalityAggregationTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..f0f4af24e005d1ddfc7c1256ce66bbb0abd51e7c
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+++ b/Aggregation/CardinalityAggregationTest.php
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+<?php
+
+/*
+ * This file is part of the ONGR package.
+ *
+ * (c) NFQ Technologies UAB <info@nfq.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace ONGR\ElasticsearchBundle\Tests\Unit\DSL\Aggregation;
+
+use ONGR\ElasticsearchBundle\DSL\Aggregation\CardinalityAggregation;
+
+/**
+ * Unit test for cardinality aggregation.
+ */
+class CardinalityAggregationTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Tests if CardinalityAggregation#getArray throws exception when expected.
+     *
+     * @expectedException \LogicException
+     * @expectedExceptionMessage Cardinality aggregation must have field or script set.
+     */
+    public function testGetArrayException()
+    {
+        $aggregation = new CardinalityAggregation('bar');
+        $aggregation->getArray();
+    }
+}