public function addCategoryToGroupById($groupId, $categoryId);
/** @test */ function it_add_a_category_to_a_group_by_id(NotifynderGroupCategoryDB $groupCategoryDB, NotificationGroup $group) { $group_id = 1; $category_id = 2; $groupCategoryDB->addCategoryToGroupById($group_id, $category_id)->shouldBeCalled()->willReturn($group); $this->addCategoryToGroupById($group_id, $category_id)->shouldReturnAnInstanceOf(NotificationGroup::class); }