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

问题描述

我有一个 Java 课程.我如何单元测试?

I have a Java class. How can I unit test it?

在我的例子中，我有类做一个二进制和.它需要两个 byte[] 数组，将它们相加，然后返回一个新的二进制数组.

In my case, I have class does a binary sum. It takes two byte[] arrays, sums them, and returns a new binary array.

推荐答案

1. 使用正确的输入定义正常情况下的预期和期望输出.

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，将其命名为任何名称(通常类似于 TestAddingModule)，并向其添加 testAdd 方法(即如下所示):

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) :

• 编写一个方法，并在其上方添加@Test 注解.
• 在该方法中，运行二进制和和assertEquals(expectedVal,calculatedVal).

• 通过运行来测试您的方法(在 Eclipse 中，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));
}

根据需要添加其他案例.

Add other cases as desired.

• 如果存在整数溢出，请测试您的二进制和不会引发意外异常.

• 测试您的方法是否优雅地处理 Null 输入(下面的示例).

• 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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