Micronaut [https://docs.micronaut.io/latest/guide/index.html] is a fast starting framework for microservices and serverless code similar to Spring Boot.
This project demonstrates creating a simple REST API that saves data in h2 with minimal code.
It also shows running the tests with TestNG instead of JUnit which is in most of their docs.
The gradle.properties contains the micronaut version.
The id("com.github.johnrengelman.shadow") version "7.0.0" plugin creates the fat jar to enable running from the
application from the command line.
Create a deployable Micronaut application as an executable JAR file by running ./gradlew assemble.
You can run the project with ./gradlew run, however, to see the fast start time (sub-second) you should run the
executable jar.
Call the API to check the application is working
curl -X POST "http://localhost:8080/accounts" -H "Content-Type: application/json" -d '{"name": "John Doe", "type": "CURRENT", "age": "25"}'
curl http://localhost:8080/accounts
The Micronaut test framework has JUnit and Spock annotations for intialising tests, creating mock beans and injecting beans etc.
However, it doesn't have these helpers for TestNG, so you need to initialise them manually as required.
Micronaut adds an annotation @MicronautTest for JUnit tests, but in order to run with these you need to add the
testRuntime to the micronaut block in the build.gradle.
micronaut {
runtime('netty')
testRuntime('junit5')
}
The annotations come from the 'io.micronaut.test:micronaut-test-junit5' dependency, however, Micronaut adds it
automatically when you modify the micronaut block.
NB: Adding the testRuntime to the micronaut block causes TestNG tests to not be found by gradle - even though the IDEA test runner finds and runs them just fine.