EasyMock createMock

到目前爲止，我們已經使用註解來創建Mocks。 EasyMock提供了各種方法來創建模擬對象。 EasyMock.createMock()創建的模擬，但沒有理會方法的順序調用模擬會在作出其行動的適當時機。

語法

calcService = EasyMock.createMock(CalculatorService.class);

示例

創建一個接口CalculatorService，其目的是提供各種計算相關的功能。

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); }

創建一個Java類用來表示MathApplication。

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); } }

讓我們來測試MathApplication類，通過它注入CalculatorService作一個模擬。Mock將由EasyMock創建。

在這裏，我們已經添加了兩個模擬方法調用，add()和subtract()來模擬對象，通過expect()。但在測試過程中，我們調用Add()方法前調用subtract()。當我們創建模擬對象使用EasyMock.createMock()，以便執行方法。

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.createMock(CalculatorService.class); mathApplication.setCalculatorService(calcService); } @Test public void testAddAndSubstract(){ //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 substract 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); } }

創建一個Java類在文件夾 C:\ > EasyMock_WORKSPACE 執行測試用例

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()); } }

驗證結果

使用javac編譯如下類

C:\EasyMock_WORKSPACE>javac MathApplicationTester.java

現在運行測試運行看結果

C:\EasyMock_WORKSPACE>java TestRunner

驗證輸出

true