Added geo distance aggregation

Aggregation/GeoDistanceAggregationTest.php

+<?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\GeoDistanceAggregation;
+
+class GeoDistanceAggregationTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * Test if exception is thrown when field is not set.
+     *
+     * @expectedException \LogicException
+     * @expectedExceptionMessage Geo distance aggregation must have a field set.
+     */
+    public function testGeoDistanceAggregationExceptionWhenFieldIsNotSet()
+    {
+        $agg = new GeoDistanceAggregation('test_agg');
+        $agg->setOrigin('50, 70');
+        $agg->getArray();
+    }
+
+    /**
+     * Test if exception is thrown when origin is not set.
+     *
+     * @expectedException \LogicException
+     * @expectedExceptionMessage Geo distance aggregation must have an origin set.
+     */
+    public function testGeoDistanceAggregationExceptionWhenOriginIsNotSet()
+    {
+        $agg = new GeoDistanceAggregation('test_agg');
+        $agg->setField('location');
+        $agg->getArray();
+    }
+
+    /**
+     * Test if exception is thrown when field is not set.
+     *
+     * @expectedException \LogicException
+     * @expectedExceptionMessage Either from or to must be set. Both cannot be null.
+     */
+    public function testGeoDistanceAggregationAddRangeException()
+    {
+        $agg = new GeoDistanceAggregation('test_agg');
+        $agg->addRange();
+    }
+}