In a previous blog post we made an API with spray. Now we're going to load test it. For this, we will use http://gatling.io/#/. In a scala class we can write exactly what and how we want to run the test. In this test, we will do a post to our API and create a new robot called C3PO. We will do this 1000 times per second and keep doing this for 10 seconds. For a total of 10000 C3POs! RobotsLoadTest.scala:

import io.gatling.core.Predef._
import io.gatling.http.Predef._
import scala.concurrent.duration._

class RobotsLoadTest extends Simulation {
	val baseUrl = "http://localhost:8080" //We need to have our API running here

	val httpProtocol = http
		.baseURL(baseUrl)
		.inferHtmlResources()
		.acceptEncodingHeader("gzip,deflate")
		.contentTypeHeader("application/json")
		.userAgentHeader("Apache-HttpClient/4.1.1 (java 1.5)")

	val s = scenario("Simulation")
		.exec(http("request_0")
		.post("/robots")
		.body(StringBody("""{
						|  "name": "C3PO",
						|  "amountOfArms": 2
						|}""".stripMargin))
		)

	setUp(s.inject(constantUsersPerSec(1000) during(10 seconds))).protocols(httpProtocol)
}

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