Java 使用 JUnit assertEquals 的自定义异常消息？
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Custom exception message using JUnit assertEquals?
提问by Lorm
I'm using assert equals to compare two numbers
我正在使用断言等于比较两个数字
Assert.assertEquals("My error message", First , Second);
Then, when I generate the Test Report I get
然后，当我生成测试报告时，我得到
"My error message expected(First) was(Second)"
“我预期的错误信息（第一）是（第二）”
How can I customize the part I've put in italic? And the format of the numbers?
如何自定义斜体部分？以及数字的格式？
回答by Duncan Jones
The message is hard-coded in the Assertclass. You will have to write your own code to produce a custom message:
该消息在Assert类中进行了硬编码。您必须编写自己的代码来生成自定义消息：
if (!first.equals(second)) {
throw new AssertionFailedError(
String.format("bespoke message here", first, second));
}
(Note: the above is a rough example - you'll want to check for nulls etc. See the code of Assert.javato see how it's done).
（注意：上面是一个粗略的例子 - 您需要检查空值等。请参阅 的代码Assert.java以了解它是如何完成的）。
回答by Salem
You can use something like this:
你可以使用这样的东西：
int a=1, b=2;
String str = "Failure: I was expecting %d to be equal to %d";
assertTrue(String.format(str, a, b), a == b);
回答by Lorm
Thanks to your answer I've found in the Assert class this
感谢您的回答，我在 Assert 类中找到了这个
static String format(String message, Object expected, Object actual) {
String formatted= "";
if (message != null && !message.equals(""))
formatted= message + " ";
String expectedString= String.valueOf(expected);
String actualString= String.valueOf(actual);
if (expectedString.equals(actualString))
return formatted + "expected: "
+ formatClassAndValue(expected, expectedString)
+ " but was: " + formatClassAndValue(actual, actualString);
else
return formatted + "expected:<" + expectedString + "> but was:<"
+ actualString + ">";
}
I guess I can't modify Junit Assert class, but I can create a new class in my project with the same name, just changing format, am I right? Or I can just change format in my class and it will affect the Exception thrown?
我想我不能修改 Junit Assert 类，但是我可以在我的项目中创建一个同名的新类，只是更改格式，对吗？或者我可以在我的班级中更改格式，它会影响抛出的异常？
