Sokil\Mongo\CollectionTest::testEnsureUniqueIndex PHP Method

    public function testEnsureUniqueIndex()
    {
        $this->collection->ensureUniqueIndex(array('uniqueAsc' => 1, 'uniqueDesc' => -1), true);
        $indexes = $this->collection->getIndexes();
        /*
           v.2.6.8
           array (
               0 => array (
                   'v' => 1,
                   'key' => array (
                       '_id' => 1,
                   ),
                   'name' => '_id_',
                   'ns' => 'test.phpmongo_test_collection',
               ),
               1 => array (
                   'v' => 1,
                   'unique' => true,
                   'key' => array (
                       'uniqueAsc' => 1,
                       'uniqueDesc' => -1,
                   ),
                   'name' => 'uniqueAsc_1_uniqueDesc_-1',
                   'ns' => 'test.phpmongo_test_collection',
                   'dropDups' => true,
               ),
           )
        
           v.3.0.0
           array(
               0 => array(
                   'v' => 1,
                   'key' => array (
                       '_id' => 1,
                   ),
                   'name' => '_id_',
                   'ns' => 'test.phpmongo_test_collection',
               ),
               1 => array (
                   'v' => 1,
                   'unique' => true,
                   'key' => array (
                       'uniqueAsc' => 1,
                       'uniqueDesc' => -1,
                   ),
                   'name' => 'uniqueAsc_1_uniqueDesc_-1',
                   'ns' => 'test.phpmongo_test_collection',
               ),
           )
        */
        $this->assertEquals(array('uniqueAsc' => 1, 'uniqueDesc' => -1), $indexes[1]['key']);
        $currentVersion = $this->collection->getDatabase()->getClient()->getDbVersion();
        if (version_compare($currentVersion, '3', '<')) {
            $this->assertArrayHasKey('dropDups', $indexes[1]);
            $this->assertEquals(1, $indexes[1]['dropDups']);
        }
    }