Junit单元测试

Calculator.java文件

package com.ljl.junit;
public class Calculator {

public int add(int a, int b) {
return a + b;
}

public int substract(int a, int b) {
return a - b; 
}

public int multiply(int a, int b) {
return a * b;
}

public int divide(int a, int b) throws Exception {
if(0 == b){
throw new Exception("the divisor should not be zero");
}
return a / b;
}

public int square(int n) {
return n * n;
}

public void squareRoot(int n) {
for (;;)
;
}
}

测试文件

CalculatorTest.java

package com.ljl.junit;

import static org.junit.Assert.*;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;

public class CalculatorTest {

Calculator calculator = null;

@BeforeClass
public static void setUpBeforeClass() throws Exception{
System.out.println("beforeClass");
}
@AfterClass
public static void tearDownAfterClass() throws Exception{
System.out.println("AfterClass");
}

@Before
public void setUp() throws Exception{
calculator = new Calculator();
System.out.println("before");
}

@After
public void tearDown() throws Exception{
System.out.println("after");
}

@Test
public void testAdd() {
int result = calculator.add(1, 2);
assertEquals(result,3);
}

@Test
public void testSubstract() {
int result = calculator.substract(7, 6);
assertEquals(result,1);
}

@Test
public void testMultiply() {
int result = calculator.multiply(-3, -3);
assertEquals(result,9);
}

@Test(expected = Exception.class)//异常处理
public void testDivide() throws Exception {
calculator.divide(2, 0);

}

@Test
public void testSquare() {
int result = calculator.square(-2);
assertEquals(result,4);
}

@Ignore
@Test(timeout = 100)//等待执行时间
public void testSquareRoot() {
calculator.squareRoot(4);
}

}

多个测试数据打包测试

package com.ljl.junit;

import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameters;

import java.util.Arrays;
import java.util.Collection;

@RunWith(Parameterized.class)
public class AddTest {    
    private static Calculator calculator = new Calculator();
    private int val1;
    private int val2;    
    private int sum;
    
   @Parameters
   public static Collection data() {
       return Arrays.asList(new Object[][]{
               {1,3,4},
               {2,4,6},
               {-3,3,0},
        });
    }

//构造函数，对变量进行初始化
   
   public AddTest(int val1, int val2, int sum) {
        this.val1 = val1;
        this.val2 = val2;        
        this.sum = sum;
    }

   @Test
   public void AddTest() {
        int tmp = calculator.add(val1, val2);
        assertEquals(sum,tmp);
    }

}

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