Jacoco对switch语句的报道 [英] Jacoco coverage for switch statement

问题描述

我正在为正在使用的库获取100％的代码覆盖率，而且switch语句和覆盖率似乎有些问题，我根本无法理解。

I am working to get 100% code coverage for a library I am working on and I seem to have some issues with a switch statement and the coverage which I simply don't understand.

我当前正在使用Jacoco 0.7.2，因为每个新版本似乎都与Robolectrics一起使用。

I am currently using Jacoco 0.7.2 because every newer version seems to break with Robolectrics.

我测试了一个简单的switch语句：

I test a simple switch statement:

public enum Type {
    NONE, LEGACY, AKS
}

private static Class<?> getCipherClass(Type type) {
    switch (type) {
        case LEGACY:
            return CipherWrapperLegacy.class;
        case AKS:
            return CipherWrapperAks.class;
        default:
            return null;
    }
}

我编写的测试包含以下检查（使用反射，因为该方法是私有的）：

The test I wrote contains the following checks (I have to use reflection as the method is private):

final CipherWrapper instance = CipherWrapper.createInstance(mockContext, CipherWrapper.Type.LEGACY, ALIAS);
assertNotNull(instance);

Method getCipherMethod = TestUtils.makeMethodAccessible(CipherWrapper.class, "getCipherClass", CipherWrapper.Type.class);
assertNull(getCipherMethod.invoke(instance, CipherWrapper.Type.NONE));
assertEquals(CipherWrapperAks.class, getCipherMethod.invoke(instance, CipherWrapper.Type.AKS));
assertEquals(CipherWrapperLegacy.class, getCipherMethod.invoke(instance, CipherWrapper.Type.LEGACY));

结果不是我所期望的：

该图像有点令人困惑，因为黄线表示缺少某些内容。绿色图标告诉我覆盖了3个分支中的3个。

The image is a bit confusing as the yellow line suggests that there is something missing. The green icon tells me that 3 of 3 branches are covered.

我还测试了扩展开关盒的情况，其中 case NONE 并且掉了下来，但是它什么都没有改变。

I also tested to extend the switch case with case NONE and a fall through but it didn't change anything.

我唯一能做的就是用if / else替换开关，然后我得到100％

The only thing I can do is to replace the switch with if/else and then I get 100% coverage.

当前，我有98％的覆盖率，但根据概览，我什么都不会错过：

Currently I have 98% coverage but I nothing is missed based on the overview:

推荐答案

如果invoke方法不喜欢您输入匿名变量：

If the invoke method doesn't like you putting in an anonymous variable:

getCipherMethod.invoke(instance, (CipherWrapper.Type) null);

然后尝试使用命名变量：

Then try it with a named variable:

CipherWrapper.Type nullType = null;
getCipherMethod.invoke(instance, nullType);

此外，您应该检查调用异常是否只是包装了由调用方法引起的异常，而不是调用本身出错。

Also, you should check if the invocation exception is just wrapping an exception caused by invoking the method rather than an error with invocation itself.

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