📅  最后修改于: 2020-12-06 10:17:29             🧑  作者: Mango
行为驱动开发是编写测试的样式使用给定的,当再格式的测试方法。 Mockito提供了特殊的方法。看一下下面的代码片段。
//Given
given(calcService.add(20.0,10.0)).willReturn(30.0);
//when
double result = calcService.add(20.0,10.0);
//then
Assert.assertEquals(result,30.0,0);
在这里,我们使用给定的BDDMockito类方法,而不是when方法。
步骤1-创建一个名为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
让我们通过向其注入一个CalculatorService模拟来测试MathApplication类。模拟将由Mockito创建。
文件:MathApplicationTester.java
package com.tutorialspoint.mock;
import static org.mockito.BDDMockito.*;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.runners.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 testAdd(){
//Given
given(calcService.add(20.0,10.0)).willReturn(30.0);
//when
double result = calcService.add(20.0,10.0);
//then
Assert.assertEquals(result,30.0,0);
}
}
步骤4-执行测试用例
在C:\> Mockito_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());
}
}
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
现在运行测试运行器以查看结果-
C:\Mockito_WORKSPACE>java TestRunner
验证输出。
true