Verify that all getter methods are called

Question

I have the following test where I need to verify that all getters of the Person class are being called. So far I have used mockito\'s verify() to make sure that each getter

Answer 1

I can think of two solutions for your problem:

1. Generate the Builder code programmatically, so you don't need to run tests. Java code is generated by a program and never edited by a user. Test the generator instead. Use a text template and build definitions from a serialized domain model or directly from Java compiled classes (you'll need a separate module dependent on the bean's one)

2. Write your tests against a proxy library. The problem is that regular proxies can only implement interfaces, not regular classes, and it's very cumbersome to have interfaces for Javabeans. If you choose this route, I'd go with Javassist. I coded a runnable sample and put it on GitHub. The test cases use a proxy factory to instantiate beans (instead of using new)

public class CountingCallsProxyFactory {

    public  T proxy(Class classToProxy) {
        ProxyFactory factory = new ProxyFactory();
        factory.setSuperclass(classToProxy);
        Class clazz = factory.createClass();
        T instance =  (T) clazz.newInstance();
        ProxyObject proxy = (ProxyObject) instance;
        MethodCallCounter handler = new MethodCallCounter();
        proxy.setHandler(handler);
        return instance;
    }

    public void verifyAllGettersCalled(Object bean) {
        // Query the counter against the properties in the bean
    }
}

The counter is kept inside the class MethodCallCounter