Test void methods with Autowired classes

I am a begginer in Spring and I need to write test for this class if it calls methods:

class ClassOne {

    @Autowired
    AutowiredClass a1;

    @Autowired
    AutowiredClass a2;

    void methodOne() {
        a1.method1();    
    }

    void methodTwo() {
        a2.method2();
    }
}

I've tried to write test, but failed, got NPE:

class ClassOneTest {

    @Autowired
    ClassOneInterface c1i;

    @Test
    public void testMethod1() {
        c1i.methodOne();  // <- NPE appears here..
        Mockito.verify(ClassOne.class, Mockito.times(1));
    }
}

Halp..

Would be great to successfully test void methods.