Testing JUnit

2014-09-15 Kommentare Testing

下面是一個簡單的計算機程式

Calculator.javalink
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package com.zjw.junit4;

public class Calculator {

    public int plus(int x, int y) {
        return x + y;
    }

    public int subtraction(int x, int y) {
        return x - y;
    }

    public int multiplication(int x, int y) {
        return x * y;
    }

    public int division(int x, int y) {
        return x / y;
    }

}

測試程式

TestCalculator.javalink
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package com.zjw.junit4.test;

import static org.junit.Assert.*; //注意这边,静态导入

import org.junit.Ignore;
import org.junit.Test;

import com.zjw.junit4.Calculator;

public class TestCalculator {

    @Test
    public void testPlus() {
        Calculator cal = new Calculator();
        assertEquals(cal.plus(5, 5), 10);
    }

    @Test
    public void testSubtraction() {
        Calculator cal = new Calculator();
        assertEquals(cal.subtraction(5, 5), 0);
    }

    @Ignore
    @Test
    public void testMultiplication() {
        Calculator cal = new Calculator();
        assertTrue(cal.multiplication(5, 5) > 20);
    }


    @Test(expected = java.lang.ArithmeticException.class, timeout = 50)
    public void testDivision() {
        Calculator cal = new Calculator();
        assertEquals(cal.division(8, 0), 4); //大家注意看,除数是0
    }
}
// @Test expected后面指定你希望抛出的异常,timeout的意思是 如果测试没有在50ms内完成,那么就算测试失败.
@Test(expected = java.lang.ArithmeticException.class, timeout = 50)

JUnit的Annoation:

  1. @Test: 测试方法
    a. (expected=XXException.class)
    b. (timeout=xxx)
  2. @Ignore: 忽略测试方法
  3. @Before: 每一个测试方法之前运行
  4. @After: 每一个测试方法之后运行
  5. @BeforeClass: 所有测试开始之前运行,别忘了方法是静态的.
  6. @AfterClass: 所有测试结束之后运行

Source :

#Testing #Java #JUnit