EasyMock.createStrictMock()创建一个模拟,并且还会处理模拟将在其操作过程中进行的方法调用的顺序.
语法
calcService = EasyMock.createStrictMock(CalculatorService.class);
示例
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()向模拟对象添加了两个模拟方法调用add()和subtract().但是在测试期间,我们在调用add()之前调用了subtract().当我们使用EasyMock.createStrictMock()创建一个模拟对象时,该方法的执行顺序很重要.
文件:MathApplicationTester.java
import org.easymock.EasyMock;import org.easymock.EasyMockRunner;import org.junit.Assert;import org.junit.Before;import org.junit.Test;import org.junit.runner.RunWith;@RunWith(EasyMockRunner.class)public class MathApplicationTester { private MathApplication mathApplication; private CalculatorService calcService; @Before public void setUp(){ mathApplication = new MathApplication(); calcService = EasyMock.createStrictMock(CalculatorService.class); mathApplication.setCalculatorService(calcService); } @Test public void testAddAndSubtract(){ //add the behavior to add numbers EasyMock.expect(calcService.add(20.0,10.0)).andReturn(30.0); //subtract the behavior to subtract numbers EasyMock.expect(calcService.subtract(20.0,10.0)).andReturn(10.0); //activate the mock EasyMock.replay(calcService); //test the subtract functionality Assert.assertEquals(mathApplication.subtract(20.0, 10.0),10.0,0); //test the add functionality Assert.assertEquals(mathApplication.add(20.0, 10.0),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
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.
testAddAndSubtract(com.IT屋.mock.MathApplicationTester): Unexpected method call CalculatorService.subtract(20.0, 10.0): CalculatorService.add(20.0, 10.0): expected: 1, actual: 0false