如何在Android中对Log.e进行单元测试? [英] How to unit test Log.e in android?

问题描述

我需要执行单元测试，当我的应用程序中发生某种情况时，我需要检查是否记录了错误消息.

I need to perform an unit test where I need to check if an error message is logged when a certain condition occurs in my app.

  try {
        //do something
    } catch (ClassCastException | IndexOutOfBoundsException e) {
        Log.e(INFOTAG, "Exception "+e.getMessage());
    }

我该如何测试?单元测试时出现以下错误.

How can I test this? I am getting the below error while unit testing.

Caused by: java.lang.RuntimeException: Method e in android.util.Log not mocked.

推荐答案

有两种方法可以做到这一点:

There are two ways to do this:

1. 您转向Powermock或Powermokito；因为那些模拟框架将允许您模拟/检查对Log.e()的静态调用.
2. 您可以考虑替换静态调用.

示例:

interface LogWrapper {
   public void e( whatever Log.e needs);
}

class LogImpl implements LogWrapper {
   @Override 
   e ( whatever ) { 
    Log.e (whatever) ; 
   }

然后，您必须使用依赖注入在要记录的类中提供一个LogWrapper对象.对于正常的生产"用法，该对象只是LogImpl的一个实例.为了进行测试，您可以使用自写的impl(跟踪发送给它的日志)；或者您可以使用任何非强大的模拟框架(例如EasyMock或Mokito)对其进行模拟.然后，您可以使用模拟框架的检查/验证方面来检查使用预期参数调用了日志".

And then, you have to use dependency injection to make a LogWrapper object available within the classes you want to log. For normal "production" usage, that object is simply an instance of LogImpl; for testing, you can either use a self-written impl (that keeps track of the logs send to it); or you can use any of the non-power mocking frameworks (like EasyMock or Mokito) to mock it. And then you use the checking/verification aspect of the mocking framework to check "log was called with the expected parametes".

请注意:根据您的设置，选项2可能会过大.但就我个人而言，我避免使用Powermock.仅仅是因为我浪费了太多时间来寻找Powermock的怪异问题.而且我喜欢进行覆盖率测量；有时Powermock也会在那给您带来麻烦.

Please note: depending on your setup, option 2 might be overkill. But me, personally, I avoid any usage of Powermock; simply because I have wasted too many hours of my life hunting down bizarre problems with Powermock. And I like to do coverage measurements; and sometimes Powermock gives you problems there, too.

但是，当您询问有关Powermock的信息时，您基本上希望查看此处(powermockito)或此处(powermock).作为记录:下次尝试使用您喜欢的搜索引擎.真的不像您是第一个问这个的人.

But as you are asking about Powermock, you basically want to look here (powermockito) or here (powermock). And for the record: try using your favorite search engine the next time. It is really not like you are the first person asking this.

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