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Mockito 提供了一个应答接口, 允许 stubbing 具有泛型接口。
//add the behavior to add numberswhen(calcService.add(20.0,10.0)).thenAnswer(newAnswer<Double>(){@OverridepublicDoubleanswer(InvocationOnMockinvocation)throwsThrowable{//get the arguments passed to mockObject[]args =invocation.getArguments();//get the mock Objectmock =invocation.getMock();//return the resultreturn30.0;}});
步骤1−创建一个称为 CalculatorService 的接口, 以提供数学函数
文件: CalculatorService. java
/**
* 计算相关服务
*/
public interface CalculatorService {
/**
* 加法
*
* @param input1
* @param input2
* @return
*/
public double add(double input1, double input2);
/**
* 减法
*
* @param input1
* @param input2
* @return
*/
public double subtract(double input1, double input2);
/**
* 乘法
*
* @param input1
* @param input2
* @return
*/
public double multiply(double input1, double input2);
/**
* 除法
*
* @param input1
* @param input2
* @return
*/
public double divide(double input1, double input2);
}
步骤2−创建一个 JAVA 类来表示 MathApplication
文件: MathApplication. java
/**
* 数学应用
*/
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);
}
}
步骤3−测试 MathApplication 类
让我们测试 MathApplication 类, 通过注入一个 calculatorService 的Mock。Mock将由 Mockito 创建。
在这里, 我们添加了一个模拟方法调用, add() 到模拟对象when ()。但是在测试过程中, 我们在调用 add () 之前调用了subtract ()。当我们使用 Mockito 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 static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.runners.MockitoJUnitRunner;
import org.mockito.stubbing.Answer;
// @RunWith attaches a runner with the test class to initialize the test data
@RunWith(MockitoJUnitRunner.class)
public class MathApplicationTester {
private MathApplication mathApplication;
private CalculatorService calcService;
@Before
public void setUp(){
mathApplication = new MathApplication();
calcService = mock(CalculatorService.class);
mathApplication.setCalculatorService(calcService);
}
@Test
public void testAdd(){
//add the behavior to add numbers
when(calcService.add(20.0,10.0)).thenAnswer(new Answer<Double>() {
@Override
public Double answer(InvocationOnMock invocation) throws Throwable {
//get the arguments passed to mock
Object[] args = invocation.getArguments();
//get the mock
Object mock = invocation.getMock();
//return the result
return 30.0;
}
});
//test the add functionality
Assert.assertEquals(mathApplication.add(20.0, 10.0),30.0,0);
}
}
步骤4−执行测试用例
在C: \ > Mockito_WORKSPACE中创建名为 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());
}
}
步骤5−验证结果
使用javac编译器编译类, 如下所示−
C:\Mockito_WORKSPACE>javac CalculatorService.java MathApplication.
java MathApplicationTester.java TestRunner.java
现在运行TestRunner以查看结果−
C:\Mockito_WORKSPACE>java TestRunner
验证输出。
true
翻译自:https://www.tutorialspoint.com/mockito/mockito_callbacks.htm
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原文链接 : https://chenjianfei.blog.csdn.net/article/details/79546685
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