package org.wamblee.reflection;

import static junit.framework.Assert.*;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;

import org.junit.Test;

public class ReflectionUtilsTest {

    public static interface X {
        void x();
    }

    public static class X2 {
        private int bla;

        public void x() {

        }

        private void y() {

        }
    }

    public static class X3 extends X2 {
        public void z() {

        }
    }

    public static class X4 extends X2 {
        public void x() {

        }
    }
    
    public static class X5 extends X2 { 
        private String field; 
        private int g; 
    }

    @Test(expected = IllegalArgumentException.class)
    public void testGetAllMethodsInterface() {
        ReflectionUtils.getAllMethods(X.class);
    }

    @Test
    public void testBasicClass() {
        List<Method> res = ReflectionUtils.getAllMethods(X2.class, Object.class);
        assertEquals(2, res.size());
    }

    @Test
    public void testInheritanceAdditionalMethod() {
        List<Method> res = ReflectionUtils.getAllMethods(X3.class, Object.class);
        assertEquals(3, res.size());
    }

    @Test
    public void testInheritanceOverriddenMethod() {
        List<Method> res = ReflectionUtils.getAllMethods(X4.class, Object.class);
        assertEquals(2, res.size());
        for (Method method : res) {
            if (method.getName().equals("x")) {
                assertEquals(X4.class, method.getDeclaringClass());
            }
        }
    }
    
    @Test(expected = IllegalArgumentException.class)
    public void testGetAllFieldsInterface() {
        ReflectionUtils.getAllFields(X.class);
    }

    @Test
    public void testFieldsFromBasicClass() { 
        List<Field> fields = ReflectionUtils.getAllFields(X2.class);
        assertEquals(1, fields.size());
        assertEquals("bla", fields.get(0).getName());
    }
    
    public void testFieldsWithInheritance() { 
        List<Field> fields = ReflectionUtils.getAllFields(X5.class);
        assertEquals(3, fields.size());
    }
}