實(shí)例類：package com.mypackage.junittest;public class Calculator {private static int result; // 靜態(tài)變量，用于存儲(chǔ)運(yùn)行結(jié)果public void add(int n) {result = result + n;}public void substract(int n) {result = result - 1; // Bug: 正確的應(yīng)該是 result =result-n}public void multiply(int n) {} // 此方法尚未寫好public void divide(int n) {result = result / n;}public void square(int n) {result = n * n;}public void squareRoot(int n) {for (;;); // Bug : 死循環(huán)}public void clear() { // 將結(jié)果清零result = 0;}public int getResult() {return result;}}==================================================測(cè)試類：package com.mypackage.junittest;import static org.junit.Assert.assertEquals;import org.junit.Before;import org.junit.Ignore;import org.junit.Test;public class CalculatorTest {private static Calculator calculator = new Calculator();@Beforepublic void setUp() throws Exception {calculator.clear();}@Testpublic void testAdd() {calculator.add(2);calculator.add(3);assertEquals(5, calculator.getResult());}@Testpublic void testSubstract() {calculator.add(10);calculator.substract(2);assertEquals(8, calculator.getResult());}@Testpublic void testDivide() {calculator.add(8);calculator.divide(2);assertEquals(4, calculator.getResult());}}