用例规约

<span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>对用</span><span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>例作用和目的的简要描述</span>

<span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>事件流包括基本流和备选流。</span><span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>基本流描述的是用例的基本流程，<br>是指用例“正常”运行时的场景。</span>

<span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>同一个用例在实际执行的时候会有很多不同的情况发生，称之为用例场景，<br>也可以说用例场景就是用例的实例。</span>

<span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>特殊需求指的是一个用例的非功能性需求和设计约束。<br></span><span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>特殊需求通常是非功能性需求，包括可靠性、性能、可用性和可扩展性等。<br></span><span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>例如法律或法规方面的需求、应用程序标准和所构建系统的质量属性等。</span>

<span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>执行用</span><span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>例之前系统必须所处的状态。<br></span><span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>例如，前置条件是要求用户有访问的权限或是要求某个用例必须已经执行完。</span>

<span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>用例执行完毕后系统可能处于的一组状态。<br></span><span style='text-align: justify; color: rgb(51, 51, 51); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; font-style: normal; font-weight: 400; word-spacing: 0px; float: none; display: inline !important; white-space: normal; orphans: 2; widows: 2; -webkit-text-stroke-width: 0px; font-variant-ligatures: normal; font-variant-caps: normal; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;'>例如，要求在某个用例执行完后，必须执行另一个用例。</span>