EasyMock.createNiceMock()创建一个mock并设置mock的每个方法的默认实现.如果使用EasyMock.createMock(),则调用mock方法会抛出断言错误.
calcService = EasyMock.createNiceMock(CalculatorService.class);
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.
这里我们通过expect()添加了一个模拟方法调用add().但是在测试期间,我们也调用了subtract()和其他方法.当我们使用EasyMock.createNiceMock()创建一个模拟对象时,可以使用默认值的默认实现.
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); calcService.serviceUsed(); EasyMock.expectLastCall().times(1,3); //activate the mock EasyMock.replay(calcService); //test the add functionality Assert.assertEquals(mathApplication.add(10.0, 20.0),30.0,0); //verify call to calcService is made or not EasyMock.verify(calcService); } }
第4步: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 <h3
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 MathApplicationTester.java
现在运行Test Runner查看结果:
C: \ EasyMock_WORKSPACE> java TestRunner
验证输出.
true