feat(Gatlin): Setup

Added Gatlin Setup and a test "test".

src/gatling/resources/gatling.conf

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+gatling {
+  http {
+    # Disable Google Analytics telemetry
+    enableGA = false
+  }
+}

src/gatling/resources/logback-test.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+
+	<appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%-5level] %logger{15} - %msg%n%rEx</pattern>
+		</encoder>
+		<immediateFlush>false</immediateFlush>
+	</appender>
+
+	<!-- uncomment and set to DEBUG to log all failing HTTP requests -->
+	<!-- uncomment and set to TRACE to log all HTTP requests -->
+	<!--<logger name="io.gatling.http.engine.response" level="TRACE" />-->
+
+	<root level="WARN">
+		<appender-ref ref="CONSOLE" />
+	</root>
+
+</configuration>

src/gatling/scala/base/BaseSimulation.scala

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+package base
+
+import io.gatling.core.Predef._
+import io.gatling.http.Predef._
+import io.gatling.http.protocol.HttpProtocolBuilder
+
+/**
+ * Base class for all simulations.
+ *
+ * Reads runtime configuration from JVM system properties set by Gradle:
+ *   -Dtarget.baseUrl=...       (via -PbaseUrl=... on the Gradle command line)
+ *   -Dgatling.authToken=...    (via -PauthToken=... or env GATLING_AUTH_TOKEN)
+ */
+abstract class BaseSimulation extends Simulation {
+
+  protected val baseUrl: String =
+    sys.props.getOrElse("target.baseUrl", "http://localhost:8080")
+
+  private val authToken: String =
+    sys.props.getOrElse("gatling.authToken", "")
+
+  protected val httpProtocol: HttpProtocolBuilder = http
+    .baseUrl(baseUrl)
+    .header("Authorization", s"Bearer $authToken")
+    .header("Accept", "application/json")
+}

src/gatling/scala/simulations/SmokeTestSimulation.scala

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+package simulations
+
+import base.BaseSimulation
+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))
+  ).protocols(httpProtocol)
+}