mockito

MockitoAnnotationTest.java

package org.pierre.mockito;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.*;
import org.mockito.junit.MockitoJUnitRunner;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.junit.jupiter.api.Assertions.assertEquals;



@RunWith(MockitoJUnitRunner.class)
public class MockitoAnnotationTest {

    @Mock
    List<String> mockList;

    @Test
    public void whenNotUseMockAnnotation_thenCorrect() {
        mockList.add("one");
        System.out.println(mockList.size());
        Mockito.verify(mockList).add("one");
        System.out.println(mockList);
        assertEquals(0, mockList.size());
        System.out.println(mockList.size());

        Mockito.when(mockList.size()).thenReturn(100);
        assertEquals(100, mockList.size());
    }

    @Spy
    List<String> spiedList = new ArrayList<String>();

    @Test
    public void whenUseSpyAnnotation_thenSpyIsInjected() {
        spiedList.add("one");
        spiedList.add("two");

        Mockito.verify(spiedList).add("one");
        Mockito.verify(spiedList).add("two");

        assertEquals(2, spiedList.size());

        Mockito.doReturn(100).when(spiedList).size();
        assertEquals(100, spiedList.size());
    }

    @Mock
    List<String> mockedList;

    @Captor
    ArgumentCaptor<String> argCaptor;

    @Test
    public void whenUseCaptorAnnotation_thenTheSam() {
        mockedList.add("one");
        Mockito.verify(mockedList).add(argCaptor.capture());

        assertEquals("one", argCaptor.getValue());
    }


    @Mock
    Map<String, String> wordMap;

    @InjectMocks
    MyDictionary dic = new MyDictionary();

    @Test
    public void whenUseInjectMocksAnnotation_thenCorrect() {
        Mockito.when(wordMap.get("aWord")).thenReturn("aMeaning");

        assertEquals("aMeaning", dic.getMeaning("aWord"));
    }
}



class MyDictionary {
    Map<String, String> wordMap;

    public MyDictionary() {
        wordMap = new HashMap<String, String>();
    }
    public void add(final String word, final String meaning) {
        wordMap.put(word, meaning);
    }
    public String getMeaning(final String word) {
        return wordMap.get(word);
    }
}