在本章中,我们将学习如何将JUnit和EasyMock集成在一起.在这里,我们将创建一个Math Application,它使用CalculatorService来执行基本的数学运算,例如加法,减法,乘法和除法.我们将使用EasyMock来模拟CalculatorService的虚拟实现.此外,我们广泛使用注释来展示它们与JUnit和EasyMock的兼容性.
下面将逐步讨论该过程.
步骤1:创建名为CalculatorService的接口以提供数学函数
文件:CalculatorService.java
public interface CalculatorService { public double add(double input1, double input2); public double subtract(double input1, double input2); public double multiply(double input1, double input2); public double divide(double input1, double input2); }
第2步:创建一个JAVA类来表示MathApplication
文件:MathApplication.java
public class MathApplication { private CalculatorService calcService; public void setCalculatorService(CalculatorService calcService){ this.calcService = calcService; } public double add(double input1, double input2){ return calcService.add(input1, input2); } public double subtract(double input1, double input2){ return calcService.subtract(input1, input2); } public double multiply(double input1, double input2){ return calcService.multiply(input1, input2); } public double divide(double input1, double input2){ return calcService.divide(input1, input2); } }
第3步:测试MathApplication类
让我们通过在其中注入一个模拟的calculatorService来测试MathApplication类.模拟将由EasyMock创建.
文件:MathApplicationTester.java
import org.easymock.EasyMock; import org.easymock.EasyMockRunner; import org.easymock.Mock; import org.easymock.TestSubject; import org.junit.Assert; import org.junit.Before; import org.junit.Test; import org.junit.runner.RunWith; // @RunWith attaches a runner with the test class to initialize the test data @RunWith(EasyMockRunner.class) public class MathApplicationTester { // @TestSubject annotation is used to identify class which is going to use the mock object @TestSubject MathApplication mathApplication = new MathApplication(); //@Mock annotation is used to create the mock object to be injected @Mock CalculatorService calcService; @Test public void testAdd(){ //add the behavior of calc service to add two numbers EasyMock.expect(calcService.add(10.0,20.0)).andReturn(30.00); //activate the mock EasyMock.replay(calcService); //test the add functionality Assert.assertEquals(mathApplication.add(10.0, 20.0),30.0,0); } }
第4步:创建一个类来执行测试用例
在 C:\> EasyMock_WORKSPACE 中创建一个名为TestRunner的java类文件,以执行测试用例.
文件:TestRunner.java
import org.junit.runner.JUnitCore; import org.junit.runner.Result; import org.junit.runner.notification.Failure; public class TestRunner { public static void main(String[] args) { Result result = JUnitCore.runClasses(MathApplicationTester.class); for (Failure failure : result.getFailures()) { System.out.println(failure.toString()); } System.out.println(result.wasSuccessful()); } }
第5步:验证结果
使用 javac 编译器编译类,如下所示:
C:\ EasyMock_WORKSPACE> javac CalculatorService.java MathApplication .java MathApplicationTester.java TestRunner.java
现在运行Test Runner查看结果:
C:\ EasyMock_WORKSPACE> java TestRunner
验证输出.
true
要了解有关JUnit的更多信息,请参阅Tutorials Point的JUnit Tutorial.