public function testBuild()
{
$this->getRepositoryConfigMock()->expects($this->once())->method('getRepositoryConfig')->willReturn(['fields_groups' => ['list' => ['group_a', 'group_b'], 'default' => 'group_a']]);
$this->getTranslatorMock()->expects($this->any())->method('trans')->will($this->returnArgument(0));
$factory = new RepositoryConfigFieldsGroupsListFactory($this->getRepositoryConfigMock());
$list = $factory->build($this->getTranslatorMock());
self::assertEquals(['group_a' => 'group_a', 'group_b' => 'group_b'], $list->getGroups());
self::assertEquals('group_a', $list->getDefaultGroup());
}