Mockito提供以下额外方法来改变预期的通话次数.
atLeast(int min) : 期待最少的电话.
atLeastOnce() : 预计至少有一次电话会议.
atMost(int max) : 期望最大通话.
步骤1号;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); } 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 static org.mockito.Mockito.atLeastOnce; import static org.mockito.Mockito.atLeast; import static org.mockito.Mockito.atMost; 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); //add the behavior of calc service to subtract two numbers when(calcService.subtract(20.0,10.0)).thenReturn(10.00); //test the add functionality Assert.assertEquals(mathApplication.add(10.0, 20.0),30.0,0); Assert.assertEquals(mathApplication.add(10.0, 20.0),30.0,0); Assert.assertEquals(mathApplication.add(10.0, 20.0),30.0,0); //test the subtract functionality Assert.assertEquals(mathApplication.subtract(20.0, 10.0),10.0,0.0); //check a minimum 1 call count verify(calcService, atLeastOnce()).subtract(20.0, 10.0); //check if add function is called minimum 2 times verify(calcService, atLeast(2)).add(10.0, 20.0); //check if add function is called maximum 3 times verify(calcService, atMost(3)).add(10.0,20.0); } }
步骤4 : 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