Question

我遇到了一个奇怪的问题。我的测试用例有一个失败的测试，welcometest。但是，如果我单独运行它，它运行完美。我是JUnit的新手，不知道为什么会发生这种情况。

package com.twu.biblioteca;

org.junit.After;
import org.junit.Before; 
import org.mockito.Mockito;
import org.mockito.Mockito.*;
import org.junit.Test;

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.*;


public class ExampleTest {
    @Test
    public void welcometest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        test.welcome(asker);
        verify(asker).printLine("**** Welcome Customer! We are glad to have you at Biblioteca! ****");
    }

    @Test
    public void addBooksTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        test.addBooks();

        assertEquals("Head First Java", test.booksList[1].name);
        assertEquals("Dheeraj Malhotra", test.booksList[2].author);
        assertEquals(2009, test.booksList[3].publication);
    }

    @Test
    public void CustomersaddedTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        test.addCustomers();

        assertEquals("Ritabrata Moitra", test.customerList[1].name);
        assertEquals("121-1523", test.customerList[2].libraryNumber);
        assertEquals("0987654321", test.customerList[3].number);
    }

    @Test
    public void addMoviesTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        test.addMovies();

        assertEquals("Taken", test.moviesList[1].name);
        assertEquals("Steven Spielberg", test.moviesList[2].director);
        assertEquals(2004, test.moviesList[3].year);
    }


    @Test
    public void getBoundIntegerFromUserTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        when(asker.ask("Enter your choice. ")).thenReturn(99);
        when(asker.ask("Select a valid option! ")).thenReturn(1);

        BibliotecaApp.getBoundIntegerFromUser(asker, "Enter your choice. ", 1, 2);

        verify(asker).ask("Select a valid option! ");
    }

    @Test
    public void mainMenuTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        when(asker.ask("Enter your choice. ")).thenReturn(test.numberOfMainMenuOptions);

        test.mainMenu(asker);

        verify(test).mainMenuaction(3, asker);
    }

    @Test
    public void checkoutTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        when(asker.ask("Enter the serial number of the book that you want to checkout")).thenReturn(2);

        test.addBooks();
        test.checkout(asker);

        assertEquals(0, test.booksList[2].checkoutstatus);
    }

    @Test
    public void returnTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        when(asker.ask("Enter the serial number of the book that you want to return")).thenReturn(2);

        test.addBooks();
        test.booksList[2].checkoutstatus = 0;
        test.returnBook(asker);

        assertEquals(1, test.booksList[2].checkoutstatus);
    }

    @Test
    public void checkoutMovieTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        when(asker.ask("Enter the serial number of the movie that you want to checkout")).thenReturn(2);

        test.addMovies();
        test.checkoutMovie(asker);

        assertEquals(0, test.moviesList[2].checkoutstatus);
    }

    @Test
    public void returnMovieTest() {
        BibliotecaApp test = mock(BibliotecaApp.class);
        BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
        when(asker.ask("Enter the serial number of the movie that you want to return")).thenReturn(2);

        test.addMovies();
        test.moviesList[2].checkoutstatus = 0;
        test.returnMovie(asker);

        assertEquals(1, test.moviesList[2].checkoutstatus);
    }

//    @Test
//    public void checkoutWithoutLoginTest(){
//        BibliotecaApp test = mock(BibliotecaApp.class);
//        BibliotecaApp.IntegerAsker asker =          mock(BibliotecaApp.IntegerAsker.class);
//        when(asker.ask("Enter your choice. ")).thenReturn(8);
//        test.loginStatus = false;
//
//
//        test.mainMenuaction(3,asker);
//
//        verify(test,times(0)).checkout(asker);
//    }
}

如果我注释掉最后一个测试（已经注释掉了），我的所有测试都会成功运行！但是，如果我不评论它，一个测试失败，但这不是这个测试！ welcometest失败了！

Answer 1

 BibliotecaApp test = mock(BibliotecaApp.class);
 BibliotecaApp.IntegerAsker asker = mock(BibliotecaApp.IntegerAsker.class);
 test.welcome(asker);
 verify(asker).printLine("**** Welcome Customer! We are glad to have you at Biblioteca! ****");

创建MOCK BibliotecaApp
创建MOCK BibliotecaApp.IntegerAsker
使用MOCK作为参数在MOCK上运行method欢迎
期待您的MOCK确实调用另一种方法。

问题：为什么要这样做？你从来没有告诉过它。您的test对象将返回null，而不会调用任何printLine方法。

所以，就个人而言，我非常怀疑这项测试是否会成功运行，无论是孤立还是其他方式。它也没有任何意义，因为您正在测试模拟对象的行为。但我们可以假设Mockito本身已经测试得相当好。您（可能）需要使用真实的BibliotecaApp而不是模拟。

Mockito和Junit测试单独运行但在一起运行时失败

1 个答案: