Testing is a crucial part of application development and should not be overlooked. SeedStack can help you to test your application by providing the necessary tools.

Unit testing

SeedStack doesn’t provide specific tools for unit-testing. Just write your unit tests as usual.

Integration testing

SeedStack provides several features to do integration testing. You can do things like altering configuration, defining launch arguments or set system properties. This can be done either for the execution of a full test class, for a specific test only, or both.

SeedStack can support various testing frameworks but is shipping for now with support for JUnit 4, which is demonstrated here.

To test our domain service, add a GreeterServiceIT in the org.generated.project.domain.services under the src/test/java folder:

package org.generated.project.domain.services;

import static org.assertj.core.api.Assertions.assertThat;

import javax.inject.Inject;
import org.generated.project.domain.model.person.Person;
import org.generated.project.domain.model.person.PersonId;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.seedstack.seed.testing.junit4.SeedITRunner;

public class GreeterServiceIT {
    private GreeterService greeterService;

    public void testGreeting() throws Exception {
        Person person = new Person(new PersonId("test@some.org"));
        person.changeName("testFirstName", "testLastName");
        assertThat(greeterService.greet(person)).isEqualTo("Hello testFirstName testLastName!");

The runner:

  • Starts SeedStack before executing test methods,
  • Apply the requested alterations (configuration, system properties, …) before running each test,
  • Shutdown SeedStack properly after test execution.

All SeedStack features work as usual during the test. The test class itself can be injected and be the target of AOP interception. For instance a test method can be made transactional.

Web integration testing

If you already explored the project structure, you have probably found the HelloResourceIT class in the test part of the application (src/test/java).

A Web integration test is similar to a normal integration test but uses a different launcher to run the application. Here we will use the @LaunchWithUndertow annotation on the test class to run the application with the Undertow embedded server.

Let’s update the HelloResourceIT class to correspond to the current state of our application:

package org.generated.project.interfaces.rest;

import static io.restassured.RestAssured.given;
import static org.assertj.core.api.Assertions.assertThat;

import io.restassured.response.Response;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.seedstack.seed.Configuration;
import org.seedstack.seed.testing.junit4.SeedITRunner;
import org.seedstack.seed.undertow.LaunchWithUndertow;

public class HelloResourceIT {
    private String baseUrl;

    public void testHelloWorld() throws Exception {
        Response response = given()
                .auth().basic("demo", "demo")
                .when().get(baseUrl + "hello");

        assertThat(response.body().asString()).isEqualTo("Hello Ella FITZGERALD!");

The base URL of the application is available as the web.runtime.baseUrl configuration property and is retrieved with the @Configuration annotation.

The test method body uses RestAssured and AssertJ to do the testing job.

The test request contains basic authentication credentials, which can be of use if you uncomment the security configuration in the application.yaml file.

Now what ?

What we learned

In this page you have learned:

  • That you can write unit tests as usual without any SeedStack specificity.
  • How to write a standard (non-Web) integration test.
  • How to write a Web integration test.


If you can’t get this to work, check the troubleshooting page.

Missing accomplished!

We are done with the tutorial. Congratulations for getting this far!

You can now go further and explore the samples or start to read the reference documentation


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