如何编写单元测试？ [英] How to write a Unit Test?

问题描述

我有一个执行二进制求和的java类，我仍在试图弄清楚如何进行单元测试，但我不知道该怎么做。我已经用Google搜索了，我得到的最佳解释是来自维基百科的页面： http：//en.wikipedia。 org / wiki / Unit_testing

I have a java class that does a binary sum, I am still trying to figure out how to do unit tests but I don't know how to do it. I've googled around and the best explanation I had was the page from Wikipedia: http://en.wikipedia.org/wiki/Unit_testing

但我仍然不确定如何为此程序进行测试。该程序所做的基本上是2字节[]并添加它们并返回新的二进制数组。用Java编写。我该如何测试呢？

but I'm still unsure how to do my test for this program. What the program does is basically take 2 byte[] and add them and return the new binary array. Written in Java. How can I test it?

推荐答案

1. 定义正常的预期和期望输出案例，输入正确。

1. Define the expected and desired output for a normal case, with correct input.

现在，通过声明一个类来实现测试，将它命名为任何东西（通常类似于TestAddingModule），并将testAdd方法添加到它（即像一个下面）：

Now, implement the test by declaring a class, name it anything (Usually something like TestAddingModule), and add the testAdd method to it (i.e. like the one below) :

• 写一个方法，在它上面添加@Test注释。


• In方法，运行你的二进制和和$ code> assertEquals（expectedVal，calculatedVal）。



• 通过运行方法测试你的方法（在Eclipse，右键单击，选择Run as→JUnit test）。

• Write a method, and above it add the @Test annotation.
• In the method, run your binary sum and assertEquals(expectedVal,calculatedVal).

• Test your method by running it (in Eclipse, right click, select Run as → JUnit test).

//for normal addition 
@Test
public void testAdd1Plus1() 
{
    int x  = 1 ; int y = 1;
    assertEquals(2, myClass.add(x,y));
}

添加其他情况。

• 如果存在整数溢出，请测试二进制和不会引发意外异常。



• 测试您的方法是否正常处理空输入（例如下面的例子）。

• Test that your binary sum does not throw a unexpected exception if there is an integer overflow.

• Test that your method handles Null inputs gracefully (example below).

//if you are using 0 as default for null, make sure your class works in that case.
@Test
public void testAdd1Plus1() 
{
    int y = 1;
    assertEquals(0, myClass.add(null,y));
}

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