SidenでHello Worldとテスト ref: http://qiita.com/masatsugumatsus/items/c07e13f81fea12fa590e

Application.java

import ninja.siden.App;

public class Application {
    public static void main(String[] args) {

        App app = new App();

        new HelloResource(app).defineRoute();

        app.listen();   
    }
}

build.gradle

apply plugin: 'java'
apply plugin: 'groovy'


sourceCompatibility = 1.8
version = '1.0'

repositories {
    mavenCentral()
    jcenter()
}

dependencies {
    compile 'ninja.siden:siden-core:0.2.0'
    testCompile 'org.codehaus.groovy:groovy-all:2.3.8'
    testCompile 'org.spockframework:spock-core:0.7-groovy-2.0'
    testCompile 'org.codehaus.groovy.modules.http-builder:http-builder:0.7+'
}

HelloResource.java

import ninja.siden.App;

public class HelloResource {

    private App app;

    public HelloResource(App app){
        this.app = app;
    }

    public void defineRoute(){
        app.get("/hello", (req,res)->"Hello World");
    }
}

HelloResourceSpec.groovy

import groovyx.net.http.RESTClient
import ninja.siden.App
import ninja.siden.App.Stoppable
import spock.lang.Shared;
import spock.lang.Specification

class HelloResourceSpec extends Specification {

     @Shared stop

     def setupSpec(){
        def app = new App()
        new HelloResource(app).defineRoute()
        stop = app.listen()
    }

    def "簡単な起動のテスト"(){
        setup:
        def endpoint = new RESTClient( 'http://localhost:8080/' )
        when:
        def resp = endpoint.get([ path: 'hello'])
        then:
        with(resp) { 
            status == 200
            data.text == "Hello World"
        }
    }

    def cleanupSpec(){
        stop.stop()
    }
}