ISTQB 问题：语句覆盖率和决策覆盖率

Question

我对声明和决策覆盖感兴趣并正在研究。

What type of problem will be found with 100% decision coverage that would be missed by 100% statement coverage?
        A.  A problem that occurs within a loop
        B.  A problem that occurs in an IF with an ELSE
        C.  A problem that occurs in an IF without an ELSE
        D.  A problem that occurs outside a loop

我收到了这个示例问题，我选择正确答案为 B。 因为 100% 的语句覆盖率可确保代码中的每个单独语句至少执行一次。但是，它并不能保证所有决策分支所有可能的真假结果都已被测试。

但是我朋友说正确答案应该是C。

谁能给我解释一下正确答案。

Answer 1

例如，如果您有以下代码片段

输入年龄；

如果年龄>65

显示“你是前辈”

从陈述的角度来看，你有3个陈述，通过将覆盖100%。但是，决策/分支承保范围不包括在内 - 如果年龄为 <65? this is not covered even though statement is 100%

会发生什么

决策覆盖范围1：年龄>65 决策覆盖范围 2：年龄 < 65 Testing these both decision cases will cover the tests and will catch that scenario.