assertEquals的delta或epsilon参数的含义，用于双精度值 [英] Meaning of delta or epsilon argument of assertEquals for double values

问题描述

我有一个关于JUnit assertEquals以测试double值的问题.阅读 API文档我可以看到:

I have a question about JUnit assertEquals to test double values. Reading the API doc I can see:

@Deprecated
public static void assertEquals(double expected, double actual)

已弃用.改为使用assertEquals(double expected, double actual, double delta).

(注意:在较早的文档版本中，delta参数称为epsilon)

delta(或epsilon)参数是什么意思?

What does the delta (or epsilon) parameter mean?

推荐答案

Epsilon是两个数字之间可取的值.因此，只要Math.abs(expected - actual) < epsilon

Epsilon is the value that the 2 numbers can be off by. So it will assert to true as long as Math.abs(expected - actual) < epsilon

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