如何为add方法编写junit testCase？
这是多项式的 add 方法
public Polynomilal add (Polynomial poly){
//getA()..etc getters for the coefficients of the polynomial.
MyDouble aVal=getA().add(poly.getA());
MyDouble bVal=getB().add(poly.getB());
MyDouble cVal=getC().add(poly.getC());
Polynomial addedPoly=new Polynomial(aVal, bVal, cVal);
return addedPoly;
}
，add 方法的测试用例以
public void testAdd() {
........
........
}
here is the add method for polynomial
public Polynomilal add (Polynomial poly){
//getA()..etc getters for the coefficients of the polynomial.
MyDouble aVal=getA().add(poly.getA());
MyDouble bVal=getB().add(poly.getB());
MyDouble cVal=getC().add(poly.getC());
Polynomial addedPoly=new Polynomial(aVal, bVal, cVal);
return addedPoly;
}
and the test case for add method starts with
public void testAdd() {
........
........
}
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以下是一些基础知识...
单元测试的总体思路是将“您想要的”与“您得到的”进行比较。一个简单的断言就像
如果你知道 aVal 应该是什么，你可以做
“double”值有一个特殊的细节，因为舍入导致它们通常不完全是你所期望的，所以你说：
无论如何，这就是单位的要点测试。对你能看到的事物的断言。非常方便的东西。
（assertEquals 等都可以从 TestCase 静态访问，大多数单元测试都源自 TestCase。）
Here's some of the basics...
The general idea of a unit test is to compare "What you want" with "What you got". A simple assertion is like
If you know what aVal should be, you can do
There's a special detail for "double" values, because roundoff causes them to often be not exactly what you expect, so you say:
Anyway, that's the gist of unit tests. Assertions of things you can see. Very handy stuff.
(assertEquals, and friends, are all statically accessible from TestCase, which most unit tests descend from.)
除了大卫的回答之外，我建议您使用此处描述的自定义断言模式。另外，我会考虑对输入和预期数据使用参数化测试，如此处所述，并使用一些特定于 JUnit 的测试例如以下内容。
希望这有帮助！
As addition to david's answer I recommend you to use Custom Assertion pattern described here. Also I'd consider using parametrized tests for input and expected data as described here and using some JUnit specific examples like the following.
Hope this helps!