Mockito 测试单独工作，但当运行在一起时，只有一个工作

Question

我遇到了一个奇怪的问题。我的测试用例有两个失败的测试，第一个和第三个。但是，如果我单独运行相同，它运行就完美了。我是 JUnit 的新手，不知道为什么会这样。我试图重新模拟并在 setUp() 方法中初始化它们，但它没有帮助。静态缓存有问题吗？

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.Mockito;

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

class CharCounterTest {

    private CharCounter charCounter;
    private CharCounter spyCharCounter;

    @BeforeEach
    public void setUp() {
        charCounter = new CharCounter();
        spyCharCounter = Mockito.spy(charCounter);
    }

    @AfterEach
    public void cleanUp(){
        Mockito.reset(spyCharCounter);
    }

    @Test
    void given3IdenticalInputs_whenGetCharacterFrequency_thenPutInputInCacheOnce() {
        //CharCounter charCounter = Mockito.spy(new CharCounter());
        spyCharCounter.getCharacterFrequency("hello world!");
        spyCharCounter.getCharacterFrequency("hello world!");
        spyCharCounter.getCharacterFrequency("hello world!");

        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("hello world!");
    }

    @Test
    void given3DiffrentsInputs_whenGetCharacterFrequency_thenPutInputInCacheThrice() {
        //CharCounter charCounter = Mockito.spy(new CharCounter());
        spyCharCounter.getCharacterFrequency("hello world!");
        spyCharCounter.getCharacterFrequency("hello!");
        spyCharCounter.getCharacterFrequency("world!");

        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("hello world!");
        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("hello!");
        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("world!");
    }

    @Test
    void given2IdenticalAnd1DiffrentInputs_whenGetCharacterFrequency_thenPutInputInCacheTwice() {
        //CharCounter charCounter = Mockito.spy(new CharCounter());
        spyCharCounter.getCharacterFrequency("hello world!");
        spyCharCounter.getCharacterFrequency("hello world!");
        spyCharCounter.getCharacterFrequency("world!");

        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("hello world!");
        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("world!");
    }
}```

/*There's a CharCounter class, maybe there is some problems with static cache?
*/

```public class CharCounter {

    private static final CacheDecorator cache = new CacheDecorator(new LinkedHashMap<>());

    public Map<String, Long> getCharacterFrequency(String text) {

        Map<String, Long> characterFrequency;
        if (cache.containsKey(text)) {
            characterFrequency = cache.getData(text);
        } else {
            characterFrequency = countCharacters(text);
            cache.putData(text, characterFrequency);
        }
        return characterFrequency;
    }

    public Map<String, Long> countCharacters(String text) {
        Map<String, Long> frequencies = Arrays.stream(text.split(""))
                .collect(Collectors.groupingBy(Function.identity(), LinkedHashMap::new, Collectors.counting()));
        return frequencies;
    }
}```

Answer 1

静态缓存有问题，这样写测试就可以了

@Test
    void given3IdenticalInputs_whenGetCharacterFrequency_thenPutInputInCacheOnce() {
        spyCharCounter.getCharacterFrequency("hello world!");
        spyCharCounter.getCharacterFrequency("hello world!");
        spyCharCounter.getCharacterFrequency("hello world!");

        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("hello world!");
    }

    @Test
    void given3DiffrentsInputs_whenGetCharacterFrequency_thenPutInputInCacheThrice() {
        spyCharCounter.getCharacterFrequency("my name is!");
        spyCharCounter.getCharacterFrequency("my!");
        spyCharCounter.getCharacterFrequency("name!");

        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("my name is!");
        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("my!");
        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("name!");
    }

    @Test
    void 
 given2IdenticalAnd1DiffrentInputs_whenGetCharacterFrequency_thenPutInputInCacheTwice() {
        spyCharCounter.getCharacterFrequency("something!");
        spyCharCounter.getCharacterFrequency("something!");
        spyCharCounter.getCharacterFrequency("problem!");

        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("something!");
        Mockito.verify(spyCharCounter, Mockito.times(1)).countCharacters("problem!");
    }

Mockito 测试单独工作，但当运行在一起时，只有一个工作

Mockito tests work separately but when run together only one works

java

mockito

junit5

Mockito 测试单独工作，但当 运行 在一起时，只有一个工作

Mockito tests work separately but when run together only one works

java

mockito

junit5

Mockito 测试单独工作，但当运行在一起时，只有一个工作