Mockito可以确保是否使用重新获取的参数调用模拟方法.它是使用 verify()方法完成的.看一下下面的代码片段.
//测试添加功能 Assert.assertEquals(calcService.add(10.0, 20.0),30.0,0); //验证是否使用相同的参数调用calcService. verify(calcService).add(10.0,20.0);
步骤1去;创建一个名为CalculatorService的接口来提供数学函数
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步去;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); return 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步和第3步;测试MathApplication类
让我们通过在其中注入一个模拟的calculatorService来测试MathApplication类. Mock将由Mockito创建.
文件:MathApplicationTester.java
import static org.mockito.Mockito.verify; import static org.mockito.Mockito.when; import org.junit.Assert; import org.junit.Test; import org.junit.runner.RunWith; import org.mockito.InjectMocks; import org.mockito.Mock; import org.mockito.runners.MockitoJUnitRunner; // @RunWith attaches a runner with the test class to initialize the test data @RunWith(MockitoJUnitRunner.class) public class MathApplicationTester { //@InjectMocks annotation is used to create and inject the mock object @InjectMocks MathApplication mathApplication = new MathApplication(); //@Mock annotation is used to create the mock object to be injected @Mock CalculatorService calcService; @Test public void testAdd(){ //add the behavior of calc service to add two numbers when(calcService.add(10.0,20.0)).thenReturn(30.00); //test the add functionality Assert.assertEquals(calcService.add(10.0, 20.0),30.0,0); //verify the behavior verify(calcService).add(10.0, 20.0); } }
第4步去;执行测试用例
在 C:\>中创建名为TestRunner的java类文件Mockito_WORKSPACE 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()); } }
第5步去;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Test Runner查看结果
C:\Mockito_WORKSPACE>java TestRunner
验证输出.
true
第1步和第1步;创建一个接口CalculatorService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步去;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); return 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步和第3步;测试MathApplication类
让我们通过在其中注入一个模拟的calculatorService来测试MathApplication类. Mock将由Mockito创建.
文件:MathApplicationTester.java
import static org.mockito.Mockito.verify; import static org.mockito.Mockito.when; import org.junit.Assert; import org.junit.Test; import org.junit.runner.RunWith; import org.mockito.InjectMocks; import org.mockito.Mock; import org.mockito.runners.MockitoJUnitRunner; // @RunWith attaches a runner with the test class to initialize the test data @RunWith(MockitoJUnitRunner.class) public class MathApplicationTester { //@InjectMocks annotation is used to create and inject the mock object @InjectMocks MathApplication mathApplication = new MathApplication(); //@Mock annotation is used to create the mock object to be injected @Mock CalculatorService calcService; @Test public void testAdd(){ //add the behavior of calc service to add two numbers when(calcService.add(10.0,20.0)).thenReturn(30.00); //test the add functionality Assert.assertEquals(calcService.add(10.0, 20.0),30.0,0); //verify the behavior verify(calcService).add(20.0, 30.0); } }
第4步去;执行测试用例
在 C:\>中创建名为TestRunner的java类文件Mockito_WORKSPACE 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()); } }
第5步去;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Test Runner查看结果 :
C:\ Mockito_WORKSPACE> java TestRunner
验证输出.
testAdd(MathApplicationTester): Argument(s) are different! Wanted: calcService.add(20.0, 30.0); -> at MathApplicationTester.testAdd(MathApplicationTester.java:32) Actual invocation has different arguments: calcService.add(10.0, 20.0); -> at MathApplication.add(MathApplication.java:10) false