Easymock 简明教程
EasyMock - createMock
到目前为止,我们使用注解创建了模拟。EasyMock 提供了多种方法来创建模拟对象。EasyMock.createMock() 创建模拟而不必关心模拟在执行其动作时将要进行的方法调用的顺序。
Example
Step 1: Create an interface called CalculatorService to provide mathematical functions
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);
}
Step 2: Create a JAVA class to represent 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);
}
}
Step 3: Test the MathApplication class
让我们测试 MathApplication 类,并注入一个 calculatorService 模拟。模拟将由 EasyMock 创建。
这里我们通过 expect() 向 mock 对象添加了两个模拟方法调用,add() 和 subtract()。然而,在测试期间,我们在调用 add() 之前调用了 subtract()。当我们使用 EasyMock.createMock() 创建模拟对象时,方法执行顺序无关紧要。
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.createMock(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);
}
}
Step 4: Execute test cases
在 C:> EasyMock_WORKSPACE 中创建一个名为 TestRunner 的 Java 类文件来执行测试用例。
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());
}
}
Step 5: Verify the Result
使用以下 javac 编译器编译类:
C:\EasyMock_WORKSPACE>javac MathApplicationTester.java
现在运行测试运行器以查看结果 −
C:\EasyMock_WORKSPACE>java TestRunner