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

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?

You probably need @SpringBootTest. Worth reading this about junits for spring-boot apps. — Smile
– Smile, Commented Apr 5, 2021 at 3:38
Thanks, your link lead me to googling and I also found this ... following their simple public class SmokeTest, I added @SpringBootTest and @Autowired and a simple null check, but my autowired service is not getting instantiated. Any idea why? — AvaTaylor
– AvaTaylor, Commented Apr 5, 2021 at 3:56
@Smile Got it working! I also needed @RunWith(SpringRunner.class) and a couple other details. I'll write up my solution as an answer. Thanks for the help! — AvaTaylor
– AvaTaylor, Commented Apr 5, 2021 at 4:05

AvaTaylor · Accepted Answer · 2021-04-05 04:09:47Z

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); } }

Collectives™ on Stack Overflow

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

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related