Java junit 中 assertThat() 的自定义错误消息？
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custom error message for assertThat() in junit?
提问by Medya Gh
I was wondering if assertThat() has a way of adding a custom error message ?
我想知道 assertThat() 是否有添加自定义错误消息的方法？
for example in this :
例如在这个：
assertThat(file.exists(), is(equalTo(true)));
I would like to add some custom message, saying which file name doesnt exist
我想添加一些自定义消息，说明哪个文件名不存在
采纳答案by mleonard
I would prefer the following, to avoid the reader believing that you wish to assert that the file name doesn't exist..!
我更喜欢以下内容，以避免读者相信您希望断言文件名不存在..！
assertThat("File name should exist", file.exists(), is(equalTo(true)));
回答by Alexis C.
Use the overloaded assertThatmethod
使用重载assertThat方法
assertThat("File name doesn't exist", file.exists(), is(equalTo(true)));
回答by Guillaume Polet
You may want to simply use the assertTrue()methods with 2 args:
您可能只想使用assertTrue()带有 2 个参数的方法：
Assert.assertTrue("File "+file.getAbsoluePath()+"does not exist", file.exists());
回答by chipiik
I prefer this, since one can read it as a sentence: "assert that file 'myFile' exist: myFile exists is true"
我更喜欢这一点，因为人们可以将其理解为一句话：“断言该文件 'myFile' 存在：myFile 存在为真”
assertThat("File '" + myFile + "' exists", myFile.exists(), is(true));
And one gets also readable message with all necessary information when it fails:
当它失败时，还会收到包含所有必要信息的可读消息：
java.lang.AssertionError: File '/blah' exists
Expected: is <true>
but: was <false>
回答by BaptisteM
I use this method :
我用这个方法：
Throwable thrown = catchThrowable(() -> myTestedObject.funtion());
assertThat("Error Message", thrown, isInstanceOf(MyException.class));
