public function testContainsMultipleTypes()
{
$type = new ArticleType();
$test_entity = $type->createEntity();
$collection = new EntityList([$test_entity]);
$this->assertFalse($collection->containsMultipleTypes());
$type2 = new CategoryType();
$test_entity2 = $type2->createEntity();
$collection->addItem($test_entity2);
$this->assertTrue($collection->containsMultipleTypes());
}
