How do I annotate my JUnit test so it will run the way my Spring Boot app runs? - spring-boot

Question

I have a Spring Boot web application that I launch by running this class ...
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
The web app has a JSP/HTML front end served up by Spring MVC Controllers which talk to Services which talk to DAOs which uses Hibernate to read/write Entities to a MySQL database.
All the components and services get instantiated and #Autowired and the web app runs fine.
Now, I want to build JUnit tests and test some of the functionality in the Services or the DAOs.
I started writing a JUnit test like below, but I quickly got stuck on not knowing how to instantiate all the #Autowired components and classes.
public class MySQLTests {
#Test
public void test000() {
assertEquals("Here is a test for addition", 10, (7+3));
}
#Autowired
UserService userService = null;
#Test
public void test001() {
userService.doSomething("abc123");
// ...
}
}
I basically want the web application to start up and run, and then have the JUnit tests run the methods in those Services.
I need some help getting started ... is there some kind of JUnit equivalent of the #SpringBootApplication annotation that I can use in my JUnit class?

Answer 1

Answering my own question ... I got it working like this ...
Annotated the test class with:
#RunWith(SpringRunner.class)
#SpringBootTest
The test class had to be in a package above the #Controller class ... so my test class is in com.projectname.* and the controller is is com.projectname.controller.*
The working code looks like this ...
package com.projectname;
import static org.junit.Assert.assertNotNull;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import com.projectname.controller.WebController;
#RunWith(SpringRunner.class)
#SpringBootTest
public class Test1 {
#Autowired
private WebController controller;
#Test
public void contextLoads() throws Exception {
assertNotNull("WebController should not be null", controller);
}
}