用Junit测试计算器单元对象类(20210306074117)

1、实验报告五课程名称：软件测试 学生姓名：董月 班级：浦计1104班 学号:P1401110402 指导教师：韩志刚 实验日期：2014-5-8南京工业大学电子与信息学院实验五一、实验内容用jdVd语言编写一个计算器类，求实现加、减、乘、除、求平方根、求绝对值、 求倒数1/x,方法，并用junit进行对象类的单元测试。参阅帮助文档。（说明， 设计求除法、求倒数的方法，可在方法中不检测x是否为0,测试用例用y/0去 测试、求平方根可不检测x0,用负数测试）二、实验步骤首先新建一个项LI叫JUnit_Test,我们编写一个Calculator类，这是一个能够 简单实现加减乘除、平方、开方的计算器类，

2、然后对这些功能进行单元测试。建立一个hzg包:色 NCl*JRE Sys ten Library JevaSZ*l. i建立一个Calculator类:oource ioxaerjumx_iesv src DrowseFackagehzgBrowse.3Enclosing|Browse.ibrary JavaSE-jName：Mod: fi ers：Calcula torO publ i c: J defaul tn abstract II final Java, lang. ObjectprivsteprotectedSuperclass： Intr :把代码输进类中:package hzg

3、;public class Calculator private static int result; /静态变量，用于存储运行结果 public void add(int n) result = result + n;public void substract(int n) result = result - 1; /Bug:正确的应该是 result =resultn public void multiply(int n) result=result*n;public void divide(int n) result = result / n;public void square(int

4、 n) result = n * n;public void squareRoot(int n) result= (int) Math sqrt(n);public void clear() / 将结果淸零result = 0;public void reciprocal(int n) result=l/n;public void absolute(int n) result二Hath abs(n);public int getResult0 return result;第二步，将JUnit4单元测试包引入这个项目：在该项目上点右键，点“属性S在弹 出的属性窗口中,首先在左边选择“Java B

5、uild Path”，然后到右上选择“Libraries”标 签，之后在最右边点击“Add L让wry按钮，如下图所示：filter|鼻RfisonrcBuildersJvi Bjild Path Ft) Code Style 3 Jsa Coatpilar jj Jsa I di terJftVid&c LocationProject 礙fwenzKefactorinc HistoryRutJ IIebug SettinQJ) rskloryr:kJava Build Path| Sour” &Tojocts | Librariv 歸 Ortor and ExpcrdJAEs dd clas

6、s folders on the build palh：附或皿 Sys ten Library JaysSE-l. 7宙 3 JVnit 4然后在新弹出的对话框中选择JUnit4并点击确定，如上图所示，JUnit4软件包就被包 含进我们这个项目了。第三步，生成JUnit测试框架：在Eclipse的Package Explorer中用右键点击该类弹 出菜单，在弹出的对话框中，进行相应的选择加、减、乘、除，之后系统会自动生成一个新 类CalculatorTest,里而包含一些空的测试用例。只需要将这些测试用例稍作修改即可使 用。完整的CalculatorTest代码如下：J CalculaloT

7、. j “dhJjV tjozt& zrcB 由 hzg3) i Calculator javat) l Calculatorrest. jsva()kS/stcTi Lilx&ry JaraSE 1. 7.4I |/) CalGuLatorTest. S3punlau 丄ti at-L up f Liirmvac txtrep l iun calculator.clEar ():BAfterpublic Yoid tearDown() thrersrs Exception ( JOTestpublic void testAdd 11 calculatoraBd(2);calcu2atorad

8、d(3);package hzg;import static orgjunit .Assert*; import orgjunit .After;import orgjunitAfterClass;import orgjunit .Before;import orgjunitBeforeCloss;import org junit Test;public class CalculatorTest private static Calculator calculator = new Calculator0;BeforeClasspublic static void setUpBeforeClas

9、s0 throws Exception AfterClasspublic static void tearDownAfterClass0 throws Exception Beforepublic void setUp0 throws Exception calculator, clear ();Afterpublic void tearDown0 throws Exception Testpublic void testAddO calculator, add(3);calculator, add(4); assertEquals, calculator. getResult 0);Test

10、public void testSubstract 0 calculator, add(8);calculator, substract (2); assertEquals(A, calculator. getResult ();Testpublic void testMultiply0 calculator, add(4);calculator. multiply(5); assertEquals(20, calculator. getResult 0);Testpublic void testDivide() calculator, add(6);calculator, divide (3

11、); assertEquals(2, calculator. getResult ();Testpublic void testSquare0 calculator, square(-2); assertEqualsA, calculator. getResult 0);Testpublic void testSquareRoot0 calculator. squareRoot(100); assertEquals(10, calculator. getResult ();Testpublic void testReciprocalO calculator, reciprocal (5); a

12、ssertEquals(S), calculator. getResult 0);Testpublic void testAbsoluteO calculator, absolute(-7); assertEquals(J, calculator. getResult ();运行结果如下:(5 尿)hx召.CalculatgTzt Ruxuier： JUai I 曲 t&siAdd (0.000 z) 止J testSnbsiract (D.CCO s) 由:tesiDi vs de (0.000 s)t a s tS uir 10. OOO z)上UftSqucoBooQ (D- CCO k

13、)由testLeciprocal (0.CCG s)rtJ testKLsolut C. CCC z)tftztFlultiply (P. CCO “Diu)丄jlc Toiai tesLViviaeu cJcJcrtoradd(6| ;orcu.divide (0);0Tesc piiDlLc Told restSquare () iLatorTest Furr at 51巾 生 teslAdd . CCO s) 比；LestSubstract (0.000 s) 止 IcstDividc I. CCC sj 占tcstSqueirc (0.000 s;tcstSquttfcEcct 1.0

14、.000 s. tcztRciprccl (0. UUU z) 命 toziAbzcltc (0.000 :) tdstMul tiply (J). 000 s)fTeszpublic void testKultlply() cdlcwlacoi*. add (4| : cdJcwlacor.nriulclply(5): cuscsextEQueJs (2Dz cr2cwltftox口uRutul匕()；QTcszpublic void t-est-D ivide 11 聽i国.Runs： 8/8 0 Errors： 0 B Failures: 1( gL hx. CftlculfttbrT&

15、ct Rwmr： JUnit jfcl stXdd CO 000 5) 曲 tesinultiplz (0 ODD s) |jFJ leslSxibstract. (0. 000 s) 臣testBirido (0 ODD s) tftztSiuaro (0 000 z)止J t&stSurdRoof (0 ODD z) 出1 t estReci procal (I) 000 s) 由teslXbsoLate (0 DDO s)c2 cul ator add | 6);caJcitatordiv:ide |3);ass&rtKquals(Z,.getResult() | :6 Test pub

16、lic void testSquare()(caJcitator.squaxrm |-2);ass&rtKquals (4, cal cul at or .gmtRmsuLt:():6 Testpublic void testSquateRoot()(caJ C12J ator squareRoot (100);ass&rtKquals(10,丄eh丄getResult()|:O它0逮息珞罔6 Testpublic void testReciprocal()( cn? zm,?ac r nxcco 1 (匚、将减法的bug进行修改public void substract(int n) res

17、ult = result - 1; /Bug:正确的应该是 result =resultn隐 Packagg 班pl- shed after 0. 016 secondstorTesi. JavJ Calculator, javazg：事為叵-Rur匚：8/8 C Errors:0 Failures： 02se Calculator (te static int results n IS态变：用干存储运行结果一二 void add (int nJ ssizlt = result 4 n;H qiJ hxe. CalculatorTest tRuwir JUnit占:i lesiAlsolvtc . ODD s)(JJQ. CD3 z)El testttultiply (0. ODD s)ft its (Sul street 000 s)jj iastDividc (Q 030 z) 曲 testSQuare O.ODD s)te 叭SquacEoot (0 900 s jtflstHciprocAl (0 DOO z)Hi三Trace vo