How to use newThread method of org.mockitoutil.ClassLoaders class

Best Mockito code snippet using org.mockitoutil.ClassLoaders.newThread

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...86 }87 public void execute(final Runnable task) throws Exception {88 ExecutorService executorService = Executors.newSingleThreadExecutor(new ThreadFactory() {89 @Override90 public Thread newThread(Runnable r) {91 Thread thread = Executors.defaultThreadFactory().newThread(r);92 thread.setContextClassLoader(classLoader);93 return thread;94 }95 });96 try {97 Future<?> taskFuture = executorService.submit(new Runnable() {98 @Override99 public void run() {100 try {101 reloadTaskInClassLoader(task).run();102 } catch (Throwable throwable) {103 throw new IllegalStateException(format("Given task could not be loaded properly in the given classloader '%s', error '%s",104 task,105 throwable.getMessage()),...

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newThread

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1ClassLoader newClassLoader = ClassLoaders.newThread();2Class<?> clazz = newClassLoader.loadClass("com.example.MyClass");3Object instance = clazz.newInstance();4Method method = clazz.getMethod("myMethod");5method.invoke(instance);6Method staticMethod = clazz.getMethod("myStaticMethod");7staticMethod.invoke(null);8assertThat(Thread.currentThread().getContextClassLoader(), sameInstance(newClassLoader));9assertThat(Thread.currentThread().getContextClassLoader(), not(sameInstance(ClassLoaders.getClassLoader())));10assertThat(ClassLoaders.getClassLoader(), sameInstance(this.getClass().getClassLoader()));11assertThat(ClassLoaders.getClassLoader(), not(sameInstance(newClassLoader)));12assertThat(ClassLoaders.getClassLoader(), not(sameInstance(ClassLoaders.getClassLoader(this.getClass()))));13assertThat(ClassLoaders.getClassLoader(this.getClass()), sameInstance(this.getClass().getClassLoader()));14assertThat(ClassLoaders.getClassLoader(this.getClass()), not(sameInstance(newClassLoader)));15assertThat(ClassLoaders.getClassLoader(this.getClass()), not(sameInstance(ClassLoaders.getClassLoader())));16assertThat(ClassLoaders.getClassLoader(this.getClass()), not(sameInstance(ClassLoaders.getClassLoader(this.getClass()))));17assertThat(ClassLoaders.getClassLoader(ClassLoaders.class), sameInstance(ClassLoaders.class

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First of all, you should always mock the direct dependencies of an object, and not its transitive dependencies. So you should mock B, and not C, to test A. Then you would write a unit test for B by mocking C.

Second: you're not injecting the mock anywhere in the unit test. What you should have is:

public class Test {

    // not autowired here
    private A a;

    private B mockB;

    @Test
    public void testA() {
        mockB = mock(B.class);
        when(b.bFn(), anyInt()).thenReturn(something);

        // the missing part: injecting the mock into the tested object
        a = new A(mockB);
        // or a = new A();
        //    a.setB(mockB);

        assertEquals(0, a.aFn());
    }
}

When you use mock(B.class), you get one mock instance of B. That doesn't mean that all the other instances of B will do what the mock does.

Mocking C to test A is a bad practice: unit tests should test one class in isolation of the others. But if you really want that, then create a mock C, create a B and inject the mock C inside it, then create an A and inject the B inside it.

A --> B --> mockC
https://stackoverflow.com/questions/18361034/nested-method-mocking-in-mockito

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