Syntax 小黄瓜，如何编写一个有可选给定步骤的场景？

我正在编写一个简单的添加项场景。此项具有必填字段名称、编号、日期，并且该项具有可选字段类别、说明。如何指定字段：

scenario: add item
   given name
   and  number
   and  date
   but category is not null
   and description is no null
   then save item

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这是对的吗？

我会将其分为多个场景，因为每个场景都应该测试一件事情

此外，你应该始终有一个When步骤。给定是一个先决条件，并不总是需要，什么时候是一个行动，什么时候是该行动的预期结果。如果没有一个步骤，你是说你有一个什么都不做的预期结果

我会将功能文件编写为如下内容：

Feature: Add Item
    As a stock control manager
    I want to be able to add items to an inventory
    So that I have a catalogue of al items in stock

Business Rules:
    - Name, number and date are mandatory data
    - category and description are optional

Sceanrio: Add item witout category
    When I add an item without a category
    Then the Item will be saved

Sceanrio: Add item without descritpion 
    When I add an item without a descritpion 
    Then the Item will be saved

Sceanrio: Add item without name
    When I add an item without a name
    Then the item will not be saved
    And I will be informed the name is maditory

Sceanrio: Add item without number
    When I add an item without a number
    Then the item will not be saved
    And I will be informed the number is maditory

Sceanrio: Add item without date
    When I add an item without a date
    Then the item will not be saved
    And I will be informed the date is maditory

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为了完整起见，您可能还需要添加一个包含所有数据的场景。