Java Junit Mockito测试依赖类属性

目标是使用mockito执行单元测试。在第一个练习中，我创建了dependent class属性的dummy对象并测试了该类，它运行良好

现在我想用mockito模拟不直接测试的class属性。但是我得到了NullPointerException。请告知

        java.lang.NullPointerException
        at edu.uncc.ssdi.FlightReservation.<init>(FlightReservation.java:25)
        at edu.uncc.ssdi.FlightReservationTest.testFlightReservation_ParaConstructor(FlightReservationTest.java:44)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
        at org.mockito.internal.junit.JUnitRule$1.evaluateSafely(JUnitRule.java:52)
        at org.mockito.internal.junit.JUnitRule$1.evaluate(JUnitRule.java:43)
        at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
        at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
        at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
        at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
        at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

航班预订

     import java.util.Date;

    public class FlightReservation {

        public Flight flightType;
        public Date flightReservationDate;
        public int noOfAdult;
        public int noOfChildren;

        public FlightReservation() {

            flightType = null;
            flightReservationDate = null;
            noOfAdult = 0;
            noOfChildren = 0;
        }

        public FlightReservation(Flight flightType, Date flightReservationDate, int noOfAdult, int noOfChildren)
                throws ReservationException {
            super();
            String flightDetails = flightType.getOriginAirport() + "-->" + flightType.getDestinationAirport();

            if (flightType.getDepartureDate().compareTo(flightReservationDate) < 0)
                throw new ReservationException(
                        "Departure Date must be atleast 1 day after Reservation/System Date " + flightDetails);

            if (flightType.getArrivalDate().compareTo(flightType.getDepartureDate()) < 0)
                throw new ReservationException("Arrival Date is before Departure Date" + ": " + flightDetails);

            if (!checkAdultNo(noOfAdult))
                throw new ReservationException("No of Adult cannot be less than 1" + ": " + flightDetails);

            this.flightType = flightType;
            this.flightReservationDate = flightReservationDate;
            this.noOfAdult = noOfAdult;
            this.noOfChildren = noOfChildren;

        }

        public boolean checkAdultNo(int noOfAdult) {

            boolean flag = true;

            if (noOfAdult < 1) {

                flag = false;

            }

            return flag;
        }

    }

import java.util.Date；
公务舱机票预订{
公共航班类型；
公共日期航班预订日期；
公众舆论；
公共知识儿童；
公共航班预订（）{
flightType=null；
flightReservationDate=null；
noOfAdult=0；
无子女=0；
}
公共航班预订（航班类型、日期航班预订日期、int noofdult、int noOfChildren）
抛出ReservationException{
超级（）；
字符串flightDetails=flightType.getOriginAirport（）+“-->”+flightType.getDestinationAirport（）；
如果（flightType.getDepartureDate（）.compareTo（flightReservationDate）<0）
抛出新的ReservationException(
“起飞日期必须至少在预订/系统日期后1天”+航班详情）；
如果（flightType.getArrivalDate（）.compareTo（flightType.getDepartureDate（））<0）
抛出新的ReservationException（“到达日期早于出发日期”+：“+航班详细信息”）；
如果（！checkAdultNo（noOfAdult））
抛出新的ReservationException（“成人数量不能小于1”+：“+flightDetails”）；
this.flightType=flightType；
this.flightReservationDate=flightReservationDate；
this.noOfAdult=noOfAdult；
this.noOfChildren=noOfChildren；
}
公共布尔值checkAdultNo（int noofDult）{
布尔标志=真；
if（noofdefault<1）{
flag=false；
}
返回标志；
}
}

一旦您测试了构造函数，实际上您不需要模拟这些东西。您只需构建必要的对象即可

但是，如果您使用的是Mockito API注释，则应在类上使用@RunWith（MockitoJUnitRunner.class）注释，以使Mockito注释正常工作

PowerMock为这种特定情况提供了whenNew（）方法，但我真的不建议仅为此使用它

     import java.util.Date;

    public class FlightReservation {

        public Flight flightType;
        public Date flightReservationDate;
        public int noOfAdult;
        public int noOfChildren;

        public FlightReservation() {

            flightType = null;
            flightReservationDate = null;
            noOfAdult = 0;
            noOfChildren = 0;
        }

        public FlightReservation(Flight flightType, Date flightReservationDate, int noOfAdult, int noOfChildren)
                throws ReservationException {
            super();
            String flightDetails = flightType.getOriginAirport() + "-->" + flightType.getDestinationAirport();

            if (flightType.getDepartureDate().compareTo(flightReservationDate) < 0)
                throw new ReservationException(
                        "Departure Date must be atleast 1 day after Reservation/System Date " + flightDetails);

            if (flightType.getArrivalDate().compareTo(flightType.getDepartureDate()) < 0)
                throw new ReservationException("Arrival Date is before Departure Date" + ": " + flightDetails);

            if (!checkAdultNo(noOfAdult))
                throw new ReservationException("No of Adult cannot be less than 1" + ": " + flightDetails);

            this.flightType = flightType;
            this.flightReservationDate = flightReservationDate;
            this.noOfAdult = noOfAdult;
            this.noOfChildren = noOfChildren;

        }

        public boolean checkAdultNo(int noOfAdult) {

            boolean flag = true;

            if (noOfAdult < 1) {

                flag = false;

            }

            return flag;
        }

    }