Tests for BSON array and document serialize methods

tests/Model/BSONArrayTest.php

+<?php
+
+namespace MongoDB\Tests;
+
+use MongoDB\Model\BSONArray;
+
+class BSONArrayTest extends TestCase
+{
+    public function testBsonSerializeReindexesKeys()
+    {
+        $data = [0 => 'foo', 2 => 'bar'];
+
+        $array = new BSONArray($data);
+        $this->assertSame($data, $array->getArrayCopy());
+        $this->assertSame(['foo', 'bar'], $array->bsonSerialize());
+    }
+}

tests/Model/BSONDocumentTest.php

+<?php
+
+namespace MongoDB\Tests;
+
+use MongoDB\Model\BSONDocument;
+use ArrayObject;
+
+class BSONDocumentTest extends TestCase
+{
+    public function testBsonSerializeCastsToObject()
+    {
+        $data = [0 => 'foo', 2 => 'bar'];
+
+        $document = new BSONDocument($data);
+        $this->assertSame($data, $document->getArrayCopy());
+        $this->assertEquals((object) [0 => 'foo', 2 => 'bar'], $document->bsonSerialize());
+    }
+}