(译) 12-Mockito 顺序验证

Mockito 提供了一个Inorder 类, 它负责处理在适当的时间内模拟将要做出的方法调用的顺序。

语法

//create an inOrder verifier for a single mock
InOrder inOrder = inOrder(calcService);

//following will make sure that add is first called then subtract is called.
inOrder.verify(calcService).add(20.0,10.0);
inOrder.verify(calcService).subtract(20.0,10.0);

例如

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 calculatorService 的Mock。Mock将由 Mockito 创建。

在这里, 我们添加了两个模拟方法调用, add() 和subtract(), 通过when() 的模拟对象。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 创建一个模拟对象时, 该方法的执行顺序无关紧要。使用 order 类, 我们可以确保调用顺序。

文件: MathApplicationTester. java

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import static org.mockito.Mockito.inOrder;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InOrder;
import org.mockito.junit.MockitoJUnitRunner;

// @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 testAddAndSubtract(){

        //add the behavior to add numbers
        when(calcService.add(20.0,10.0)).thenReturn(30.0);

        //subtract the behavior to subtract numbers
        when(calcService.subtract(20.0,10.0)).thenReturn(10.0);

        //test the add functionality
        Assert.assertEquals(mathApplication.add(20.0, 10.0),30.0,0);

        //test the subtract functionality
        Assert.assertEquals(mathApplication.subtract(20.0, 10.0),10.0,0);

        //create an inOrder verifier for a single mock
        InOrder inOrder = inOrder(calcService);

        //following will make sure that add is first called then subtract is called.
        inOrder.verify(calcService).add(20.0,10.0);
        inOrder.verify(calcService).subtract(20.0,10.0);
    }
}

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。

testAddAndSubtract(MathApplicationTester): 
Verification in order failure
Wanted but not invoked:
calculatorService.add(20.0, 10.0);
-> at MathApplicationTester.testAddAndSubtract(MathApplicationTester.java:48)
Wanted anywhere AFTER following interaction:
calculatorService.subtract(20.0, 10.0);
-> at MathApplication.subtract(MathApplication.java:13)
false

翻译自：https://www.tutorialspoint.com/mockito/mockito_ordered_verification.htm