code_coverage_4.java

package com.example.demo;

import com.example.demo.calculator.Calculator;
import com.example.demo.calculator.CalculatorImpl;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class DemoApplication {

 	public static void main(String[] args) {
      		SpringApplication.run(DemoApplication.class, args);
 	}

 	@Bean
	public Calculator calculator() {
 		return new CalculatorImpl();
	}
}