/**
* This method tests the merge method
* of the hash map.
*
* @return void
*/
public function testMerge()
{
// initialize a new HashMap
$map = new HashMap();
// initialize a new hash map and add some elements
$mergeMap = new HashMap();
$mergeMap->add(1, "test_merge_1");
$mergeMap->add(3, "test_merge_3");
// add some elements to the original hash map
$map->add(1, "test_original_1");
$map->add(2, "test_original_2");
// merge the original map with the new one
$map->merge($mergeMap);
// check the merge result
$this->assertEquals(3, $map->size());
$this->assertEquals("test_original_1", $map->get(1));
}