Robolectric Activity Leak Fix

BaseTest.java

    @SuppressLint("NewApi")
    @After
    public void resetWindowManager() {
        Class clazz = ReflectionHelpers.loadClass(getClass().getClassLoader(), "android.view.WindowManagerGlobal");
        Object instance = ReflectionHelpers.callStaticMethod(clazz, "getInstance");

        // We essentially duplicate what's in {@link WindowManagerGlobal#closeAll} with what's below.
        // The closeAll method has a bit of a bug where it's iterating through the "roots" but
        // bases the number of objects to iterate through by the number of "views." This can result in
        // an {@link java.lang.IndexOutOfBoundsException} being thrown.
        Object lock = ReflectionHelpers.getField(instance, "mLock");

        ArrayList<Object> roots = ReflectionHelpers.getField(instance, "mRoots");
        //noinspection SynchronizationOnLocalVariableOrMethodParameter
        synchronized (lock) {
            for (int i = 0; i < roots.size(); i++) {
                ReflectionHelpers.callInstanceMethod(instance, "removeViewLocked",
                        ReflectionHelpers.ClassParameter.from(int.class, i),
                        ReflectionHelpers.ClassParameter.from(boolean.class, false));
            }
        }

        // Views will still be held by this array. We need to clear it out to ensure
        // everything is released.
        ArraySet<View> dyingViews = ReflectionHelpers.getField(instance, "mDyingViews");
        dyingViews.clear();
    }

The problem is in Android M??