издевательство над Google Guava

Question

Основной класс

public class EngineLoader {

    private final FileLoader fileLoader;
    private Cache<String, Engine> engineCache;

    public EngineLoader(final FileLoader fileLoader) {
        this.fileLoader = fileLoader;
        this.engineCache = CacheBuilder.newBuilder().expireAfterWrite(1L, TimeUnit.DAYS).build();
    }

    public Engine getEngine(final String engineName) {
        Engine engine = engineCache.getIfPresent(engineName);
        if (engine == null) {
            engine = new DroolsRuleEngine();
            engine.load(fileLoader.loadFile(engineName);
            engineCache.put(engineName, engine);
        }
        return engine;
    }
}

Тестовый класс

@ExtendWith(MockitoExtension.class)
class EngineLoaderTest {

    @Mock
    private FileLoader mockFileLoader;

    @Mock
    private Cache<String, Engine> mockEngineCache;

    private EngineLoader engineLoader;

    @BeforeEach
    public void setupTest() {
        engineLoader = new EngineLoader(mockFileLoader);
    }

    @Test
    public void test_getEngine_ABC_cacheFailure() {

        when(mockEngineCache.getIfPresent(ABC)).thenReturn(null);
        when(mockFileLoader.loadFile(ABC)).thenReturn(XYZData);

        assertNotNull(engineLoader.getEngine(ABC));
    }

    @Test
    public void test_getEngine_ABC_cacheSuccess() {

        Engine engine = new DroolsRuleEngine();

        when(mockEngineCache.getIfPresent(ABC)).thenReturn(engine);

        assertEquals(engine, engineLoader.getEngine(ABC));
    }

Я пытаюсь написать модульные тесты, имитируя кэш, но он не выполняется, поскольку кэш инициализируется экземпляром LocalCache.Таким образом, давая следующее исключение в строке, когда вызывается для mockEngineCache:

org.mockito.exceptions.misusing.UnnecessaryStubbingException: 
Unnecessary stubbings detected.
Clean & maintainable test code requires zero unnecessary code.
Following stubbings are unnecessary (click to navigate to relevant line of code):
  1. -> at loaders.EngineLoaderTest.test_getEngine_ABC_cacheFailure(EngineLoaderTest.java:54)
Please remove unnecessary stubbings or use 'lenient' strictness. More info: javadoc for UnnecessaryStubbingException class.

    at org.mockito.junit.jupiter.MockitoExtension.afterEach(MockitoExtension.java:211)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAfterEachCallbacks$11(TestMethodTestDescriptor.java:218)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$13(TestMethodTestDescriptor.java:230)
    at java.util.ArrayList.forEach(ArrayList.java:1257)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAllAfterMethodsOrCallbacks(TestMethodTestDescriptor.java:228)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAfterEachCallbacks(TestMethodTestDescriptor.java:217)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:120)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:59)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:105)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:95)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:71)
    at java.util.ArrayList.forEach(ArrayList.java:1257)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:110)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:95)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:71)
    at java.util.ArrayList.forEach(ArrayList.java:1257)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:110)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:95)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:71)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220)
    at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:188)
    at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:62)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)


Process finished with exit code 255.

Я не уверен, возможно ли это в JUnit5 или нет, но это казалось возможным согласно sage post .Я написал несколько похожих тестов для кэша гуавы, но я использовал PowerMockRunner и InjectMocks.