派突变测试失败：org.pitest.munttest.engine.gregor.mutators.emptyObjectReturnvalsMutator
在进行突变测试时，有幸存的情况。原因是org.pitest.munttest.engine.gregor.mutators.mutator.emptyobjectreturnvalsmutator
确切的错误消息是：替换为collections.take/javafile for Package/javafile :: method→幸存下来
我添加了很少的测试案例，但仍然失败了，但仍然失败了。
While running mutation test , there are survived cases . The reason is org.pitest.mutationtest.engine.gregor.mutators.EmptyObjectReturnValsMutator
The exact error message is : replaced return value with Collections.emptyList for package/JavaFile::Method → SURVIVED
I added few test cases to pass the emptyList but still failed.Can anyone please help here about this and what's the test case need to be added?
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对于返回设置的方法，有一个典型的情况。
例子：
私有设置execute（）{
}
此集合始终具有值（或）为空集。
对此方法的调用“返回execute（）”显示了用Collections替换的返回值的问题。
逻辑更改为“返回可选”（execute（）），
这解决了问题。
There is a typical case for a method which returns Set.
Example:
private Set execute() {
}
This set is always with value (or) empty set.
The call to this method 'return execute()' showed the issue of replaced return value with Collections.emptyList for package/JavaFile::Method → SURVIVED.
The logic is changed like 'return Optional.of(execute())'
This solved the issue.