DemoApplicationTests.java

package com.example.demo;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {

	@Test
	public void contextLoads() {
	}
	
	public static void main(String[] args) {
		//Triangle tr = new Triangle();
		ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); 
		Triangle tr = (Triangle)context.getBean("triangle");
		tr.draw();
	}

}