how to unit test method dependent on springBoot applicationContext?

I am trying to write a unit test for a static method which takes a class and method name and does some reflection to call the method with arguments and store the results. I'm using springboot

My test actually works when I run the full suit, but when I run the test as a stand alone it fails. The problem is that I've created a mock class (a hand written mock, not mockito or easymock) which I want the static method to use. However, the reflection can not detect my mock class because the class has not been loaded into the applicationContext by spring boot. Here is the line that fails:

T proxy = SpringApplicationContext.getBean(clazz);

SpringApplicationContext definition:

@Component
public class SpringApplicationContext implements ApplicationContextAware
{
    private static ApplicationContext applicationContext_;

@Override 
public void setApplicationContext(ApplicationContext applicaitonContext) throws BeansException {
    applicationContext_=applicaitonContext;
}

public static <T> T getBean(Class<T> requiredType) throws beanException {
      return applicationContext_.getBean(requiredType);
}

*note, I had to retype by hand, please assume obvious syntax errors are typos.

so basically my applicationContext is not being set or defined. I only need one mock bean in the applicationContext, I could do it by hand, but is there a more spring approach using annotations?