Fenos\Notifynder\Contracts\NotifynderGroupCategoryDB::addCategoryToGroupByName PHP Method

    public function addCategoryToGroupByName($groupName, $categoryName);

 /** @test */
 function it_add_a_category_to_a_group_by_name(NotifynderGroupCategoryDB $groupCategoryDB, NotificationGroup $group)
 {
     $group_name = 'mygroup';
     $category_name = 'mycategory';
     $groupCategoryDB->addCategoryToGroupByName($group_name, $category_name)->shouldBeCalled()->willReturn($group);
     $this->addCategoryToGroupByName($group_name, $category_name)->shouldReturnAnInstanceOf(NotificationGroup::class);
 }