NCS-59 Create Load tests (#2)

Added a load test and and slight change in structure. To execute type:

Run the load test:
  ./gradlew.bat gatlingRun --simulation simulations.LoadTestSimulation -PbaseUrl=https://st.nowchess.janis-eccarius.de
  -PauthToken=<token> -PmaxUsers=20 -PrampDuration=60

  Run smoke test:
  ./gradlew.bat gatlingRun --simulation simulations.SmokeTestSimulation -PbaseUrl=https://st.nowchess.janis-eccarius.de
  -PauthToken=<token>

---------

Co-authored-by: LQ63 <lkhermann@web.de>
Reviewed-on: #2
Reviewed-by: Janis <janis-e@gmx.de>

src/gatling/scala/simulations/SmokeTestSimulation.scala

@@ -1,35 +1,13 @@
 package simulations
 
 import base.BaseSimulation
+import endpoints.BoardEndpoints
 import io.gatling.core.Predef._
-import io.gatling.http.Predef._
 
-/**
- * Smoke test: verifies the cluster is reachable and the bearer token is accepted.
- *
- * Runs a single virtual user that hits GET /healthz and asserts:
- *   - HTTP 200
- *   - Response time under 2 000 ms
- *
- * Use this as a reference when writing new simulations.
- *
- * Run:
- *   ./gradlew gatlingRun -PbaseUrl=http://<cluster-service> -PauthToken=<token>
- */
 class SmokeTestSimulation extends BaseSimulation {
 
-  private val healthzPath: String =
-    sys.props.getOrElse("healthz.path", "/healthz")
-
-  private val scn = scenario("Smoke Test")
-    .exec(
-      http(s"GET $healthzPath")
-        .get(healthzPath)
-        .check(status.is(200))
-        .check(responseTimeInMillis.lte(2000))
-    )
-
   setUp(
-    scn.inject(atOnceUsers(1))
+    scenarioFromEndpoint(BoardEndpoints.createGame)
+      .inject(atOnceUsers(1))
   ).protocols(httpProtocol)
 }