feat: NCS-73 Refine Gatlin tests to reflect ordinary user behaviour (#7)

Added realistic user behaviour
Smoke Test

  1 user, runs once.
  Executes the full user journey exactly once. The goal is a fast sanity check — if this passes, the system is up
  and the critical path (register, login, import, move, resign) works end-to-end. Run this before any heavier
  test.

  ---
  Load Test

  Ramps up to maxUsers (default 10) over rampDuration (default 60s).
  Simulates normal growing traffic. Users are added gradually, each completing the full journey. This reveals how
  the system behaves under typical production load and establishes a performance baseline (response times, error
  rates) to compare other tests against.

  ---
  Stress Test

  Starts at startUsers (default 2), adds usersIncrement (default 2) users every stepDuration (default 30s) for
  steps (default 2) steps, with ramps between.
  Deliberately pushes the system beyond normal capacity in controlled steps. Each step holds load steady before
  increasing, so you can pinpoint exactly at which user count the system starts degrading or failing — the
  breaking point.

  ---
  Endurance Test

  Holds concurrentUsers (default 3) constant for duration (default 300s).
  Keeps a steady number of users playing full games repeatedly over a long period. This is the most important test
   for detecting slow degradation — memory leaks, connection pool exhaustion, database lock buildup — things that
  only appear after sustained use rather than under peak load.

  ---
  Spike Test

  Baseline → sudden burst of spikeUsers (default 15) → 5s pause → back to baseline.
  Simulates an unexpected traffic surge (e.g. a news article or viral moment). Tests whether the system can absorb
   a sudden large wave of users registering and starting games simultaneously, and whether it recovers cleanly
  once the spike subsides.

---------

Co-authored-by: LQ63 <lkhermann@web.de>
Reviewed-on: #7
Reviewed-by: Janis <janis-e@gmx.de>
Co-authored-by: Leon Hermann <lq@blackhole.local>
Co-committed-by: Leon Hermann <lq@blackhole.local>

.gitignore

@@ -1,7 +1,13 @@
-# ---> Scala
+# Scala
 *.class
 *.log
 
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+# JVM crash logs
 hs_err_pid*
 
+# Gradle
+build/
+.gradle/
+
+# Gatling results
+results/

.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/.name

@@ -0,0 +1 @@
+gatlin

.idea/Gatlin.iml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/gatling/scala" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/gatling/resources" type="scala-resource" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="scala-sdk-3.5.1" level="application" />
+  </component>
+</module>

.idea/codeStyles/codeStyleConfig.xml

@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
+  </state>
+</component>

.idea/compiler.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="26" />
+  </component>
+</project>

.idea/gradle.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

.idea/libraries/Gradle__scala_sdk_2_13_16.xml

@@ -0,0 +1,19 @@
+<component name="libraryTable">
+  <library name="Gradle: scala-sdk-2.13.16" type="Scala">
+    <properties>
+      <compiler-classpath>
+        <root url="file://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-compiler/2.13.16/341e484680c23a379e9935a7343a28969ff113a/scala-compiler-2.13.16.jar" />
+        <root url="file://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.scala-sbt/compiler-bridge_2.13/1.12.0/adefab54da046304c612e5c8155e15128487bd91/compiler-bridge_2.13-1.12.0-sources.jar" />
+        <root url="file://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.scala-sbt/compiler-interface/1.12.0/8c684a52535bd2d7cd436a9f5769364a839a5bc3/compiler-interface-1.12.0.jar" />
+        <root url="file://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-reflect/2.13.16/4958d4e43faf2d6d66f18ce2aa9a3e5ba141f87b/scala-reflect-2.13.16.jar" />
+        <root url="file://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.scala-lang/scala-library/2.13.16/9e064d9304904fd7b6bd2b55a9e601b8c1c9006e/scala-library-2.13.16.jar" />
+        <root url="file://$USER_HOME$/.gradle/caches/modules-2/files-2.1/io.github.java-diff-utils/java-diff-utils/4.15/a8b782ac93bf6c714526ac880adef7c52a87dad7/java-diff-utils-4.15.jar" />
+        <root url="file://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.jline/jline/3.27.1/cf514b38110b670f7ecd965a1c4521d8b703bf47/jline-3.27.1-jdk8.jar" />
+        <root url="file://$USER_HOME$/.gradle/caches/modules-2/files-2.1/org.scala-sbt/util-interface/1.11.5/e691fff26e8814e5773084bec55639b1e7e30fed/util-interface-1.11.5.jar" />
+      </compiler-classpath>
+    </properties>
+    <CLASSES />
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/misc.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="FrameworkDetectionExcludesConfiguration">
+    <file type="web" url="file://$PROJECT_DIR$" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_X" default="true" project-jdk-name="openjdk-26" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/scala_compiler.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ScalaCompilerConfiguration">
+    <profile name="Gradle 1" modules="gatlin.gatling,gatlin.main,gatlin.test">
+      <option name="deprecationWarnings" value="true" />
+      <option name="uncheckedWarnings" value="true" />
+    </profile>
+  </component>
+</project>

.idea/scala_settings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ScalaProjectSettings">
+    <option name="scala3DisclaimerShown" value="true" />
+  </component>
+</project>

.idea/vcs.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CommitMessageInspectionProfile">
+    <profile version="1.0">
+      <inspection_tool class="CommitFormat" enabled="true" level="WARNING" enabled_by_default="true" />
+      <inspection_tool class="CommitNamingConvention" enabled="true" level="WARNING" enabled_by_default="true" />
+    </profile>
+  </component>
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

README.md

@@ -1,2 +1,76 @@
 # Gatlin
 
+Load and integration tests for the Kubernetes cluster, built with [Gatling](https://gatling.io/) (Scala DSL).
+
+## Prerequisites
+
+- A JVM (21+) — required to run the Gradle wrapper
+- No local Gradle or Scala installation required — the wrapper downloads both automatically
+
+## Running simulations
+
+```bash
+./gradlew gatlingRun \
+  -PbaseUrl=http://<cluster-service> \
+  -PauthToken=<bearer-token>
+```
+
+On Windows:
+```bat
+gradlew.bat gatlingRun -PbaseUrl=http://<cluster-service> -PauthToken=<bearer-token>
+```
+
+The bearer token can also be supplied via the environment variable `GATLING_AUTH_TOKEN` instead of `-PauthToken`.
+
+## Running a specific simulation
+
+```bash
+./gradlew gatlingRun --simulation simulations.SmokeTestSimulation \
+  -PbaseUrl=http://<cluster-service> \
+  -PauthToken=<bearer-token>
+```
+
+## Reports
+
+HTML reports are generated under `build/reports/gatling/` after each run.
+
+## Adding a new simulation
+
+1. Create a class in `src/gatling/scala/simulations/` that extends `BaseSimulation`.
+2. Define your scenario and call `setUp(...).protocols(httpProtocol)` — the bearer token and base URL are inherited automatically.
+
+```scala
+package simulations
+
+import base.BaseSimulation
+import io.gatling.core.Predef._
+import io.gatling.http.Predef._
+
+class MyServiceSimulation extends BaseSimulation {
+
+  private val scn = scenario("My Service")
+    .exec(
+      http("GET /api/resource")
+        .get("/api/resource")
+        .check(status.is(200))
+    )
+
+  setUp(
+    scn.inject(rampUsers(10).during(30))
+  ).protocols(httpProtocol)
+}
+```
+
+## Project structure
+
+```
+src/
+  gatling/
+    scala/
+      base/              - BaseSimulation (shared protocol, auth)
+      simulations/       - one class per scenario group
+    resources/
+      gatling.conf       - Gatling configuration overrides
+      data/              - CSV feeders
+      bodies/            - request body templates
+```

build.gradle

@@ -0,0 +1,44 @@
+plugins {
+    id 'scala'
+    id 'io.gatling.gradle' version '3.15.0.1'
+}
+
+gatling {
+    enterprise {
+        // Enterprise Cloud configuration reference: https://docs.gatling.io/reference/integrations/build-tools/gradle-plugin/#running-your-simulations-on-gatling-enterprise-cloud
+    }
+}
+
+tasks.withType(ScalaCompile) {
+    scalaCompileOptions.forkOptions.with {
+        jvmArgs = ['-Xss100m'] // Scala compiler may require a larger stack size when compiling Gatling simulations
+    }
+}
+
+tasks.withType(io.gatling.gradle.GatlingRunTask) {
+    jvmArgs = [
+        '--add-opens=java.base/java.lang=ALL-UNNAMED',
+        "-Dtarget.baseUrl=${findProperty('baseUrl') ?: 'http://localhost:8080'}",
+        "-Dgatling.authToken=${findProperty('authToken') ?: System.getenv('GATLING_AUTH_TOKEN') ?: ''}",
+        "-Dhealthz.path=${findProperty('healthzPath') ?: '/health'}",
+        "-DmaxUsers=${findProperty('maxUsers') ?: '10'}",
+        "-DrampDuration=${findProperty('rampDuration') ?: '60'}",
+        "-DstartUsers=${findProperty('startUsers') ?: '2'}",
+        "-DusersIncrement=${findProperty('usersIncrement') ?: '2'}",
+        "-Dsteps=${findProperty('steps') ?: '2'}",
+        "-DstepDuration=${findProperty('stepDuration') ?: '30'}",
+        "-DconcurrentUsers=${findProperty('concurrentUsers') ?: '3'}",
+        "-Dduration=${findProperty('duration') ?: '300'}",
+        "-DbaselineUsers=${findProperty('baselineUsers') ?: '2'}",
+        "-DbaselineDuration=${findProperty('baselineDuration') ?: '20'}",
+        "-DspikeUsers=${findProperty('spikeUsers') ?: '15'}"
+    ]
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'org.scala-lang:scala-library:2.13.16'
+}

gradle.properties

@@ -0,0 +1 @@
+org.gradle.configuration-cache=true

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,213 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by "Gradle".
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other POSIX-compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the normally
+#       positional parameters. For example:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for users:
+#
+#   (2) This script is auto-generated by the Gradle build system.
+#       It is not intended to be modified by users. Run ./gradlew --version to
+#       verify the Gradle version of the wrapper.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #( absolute
+      *)    app_path=$APP_HOME$link ;; #( relative
+    esac
+done
+
+# This is reliable for symlinks on Linux and macOS.
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+        ;;
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # temporary variables.  (e.g., single temporary variable) to print
+        # something that can later be joined together to form a single variable.
+        set -- "$@" "$arg"
+        shift
+    done
+fi
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set -- \
+    "-Dorg.gradle.appname=$APP_BASE_NAME" \
+    -classpath "$CLASSPATH" \
+    org.gradle.wrapper.GradleWrapperMain \
+    "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# temporary variable character.
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^a-zA-Z0-9/=@_-]~\\&~g; ' |
+        tr '\n' ' '
+    ) $@"
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle

@@ -0,0 +1 @@
+rootProject.name = 'gatlin'

src/gatling/resources/gatling.conf

@@ -0,0 +1,6 @@
+gatling {
+  http {
+    # Disable Google Analytics telemetry
+    enableGA = false
+  }
+}

src/gatling/resources/logback-test.xml

@@ -0,0 +1,19 @@
+<?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

@@ -0,0 +1,37 @@
+package base
+
+import io.gatling.core.Predef._
+import io.gatling.core.structure.ScenarioBuilder
+import io.gatling.http.Predef._
+import io.gatling.http.protocol.HttpProtocolBuilder
+
+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")
+    .header("Content-Type", "application/json")
+
+  protected def scenarioFromEndpoint(endpoint: base.Endpoint): ScenarioBuilder = {
+    val base = endpoint.method.toUpperCase match {
+      case "GET"    => http(endpoint.name).get(endpoint.path)
+      case "POST"   => http(endpoint.name).post(endpoint.path)
+      case "PUT"    => http(endpoint.name).put(endpoint.path)
+      case "DELETE" => http(endpoint.name).delete(endpoint.path)
+      case "PATCH"  => http(endpoint.name).patch(endpoint.path)
+    }
+    val withBody = endpoint.body.fold(base)(b => base.body(StringBody(b)))
+    scenario(endpoint.name).exec(
+      withBody
+        .check(status.is(endpoint.expectedStatus))
+        .check(responseTimeInMillis.lte(endpoint.maxResponseTimeMs))
+    )
+  }
+}

src/gatling/scala/base/Endpoint.scala

@@ -0,0 +1,10 @@
+package base
+
+case class Endpoint(
+  name: String,
+  method: String,
+  path: String,
+  body: Option[String] = None,
+  expectedStatus: Int = 200,
+  maxResponseTimeMs: Int = 5000
+)

src/gatling/scala/endpoints/BoardEndpoints.scala

@@ -0,0 +1,15 @@
+package endpoints
+
+import base.Endpoint
+
+object BoardEndpoints {
+
+  val createGame: Endpoint = Endpoint(
+    name = "Create Game",
+    method = "GET",
+    path = "/api/account/official-bots/",
+    //  expectedStatus = 200
+  )
+
+  val all: List[Endpoint] = List(createGame)
+}

src/gatling/scala/scenarios/ChessUserScenario.scala

@@ -0,0 +1,61 @@
+package scenarios
+
+import io.gatling.core.Predef._
+import io.gatling.core.structure.ScenarioBuilder
+import io.gatling.http.Predef._
+
+import scala.concurrent.duration._
+
+object ChessUserScenario {
+
+  private def makeMove(uci: String) =
+    http(s"Move $uci")
+      .post(session => s"/api/board/game/${session("gameId").as[String]}/move/$uci")
+      .header("Authorization", "${jwt}")
+      .check(status.in(200, 201))
+
+  val play: ScenarioBuilder = scenario("Chess User Journey")
+    .exec(session => session.set("username", s"user_${System.currentTimeMillis()}_${session.userId}_${java.util.UUID.randomUUID().toString.take(8)}"))
+    .exec(
+      http("Register")
+        .post("/api/account")
+        .body(StringBody(session =>
+          s"""{"username":"${session("username").as[String]}","email":"${session("username").as[String]}@test.com","password":"Password123!"}"""
+        ))
+        .check(status.is(200))
+    )
+    .exec(
+      http("Login")
+        .post("/api/account/login")
+        .body(StringBody(session =>
+          s"""{"username":"${session("username").as[String]}","password":"Password123!"}"""
+        ))
+        .check(status.is(200))
+        .check(jsonPath("$.token").saveAs("jwt"))
+    )
+    .exec(
+      http("Import Game")
+        .post("/api/board/game/import/fen")
+        .header("Authorization", "${jwt}")
+        .body(StringBody(session => {
+          val username = session("username").as[String]
+          s"""{
+             |  "fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
+             |  "white": {"id": "$username", "displayName": "$username"},
+             |  "black": {"id": "opponent_${session.userId}", "displayName": "Opponent"},
+             |  "timeControl": {"limitSeconds": 300, "incrementSeconds": 3}
+             |}""".stripMargin
+        }))
+        .check(status.in(200, 201))
+        .check(jsonPath("$.gameId").saveAs("gameId"))
+    )
+    .exec(makeMove("e2e4"))
+    .exec(makeMove("e7e5"))
+    .exec(makeMove("g1f3"))
+    .exec(
+      http("Resign")
+        .post(session => s"/api/board/game/${session("gameId").as[String]}/resign")
+        .header("Authorization", "${jwt}")
+        .check(status.in(200, 201, 204))
+    )
+}

src/gatling/scala/simulations/EnduranceTestSimulation.scala

@@ -0,0 +1,26 @@
+package simulations
+
+import base.BaseSimulation
+import scenarios.ChessUserScenario
+import io.gatling.core.Predef._
+import io.gatling.http.Predef._
+
+import scala.concurrent.duration._
+
+class EnduranceTestSimulation extends BaseSimulation {
+
+  private val concurrentUsers = sys.props.getOrElse("concurrentUsers", "3").toInt
+  private val duration        = sys.props.getOrElse("duration", "300").toInt
+
+  override protected val httpProtocol = http
+    .baseUrl(baseUrl)
+    .header("Accept", "application/json")
+    .header("Content-Type", "application/json")
+
+  setUp(
+    ChessUserScenario.play
+      .inject(
+        constantConcurrentUsers(concurrentUsers).during(duration.seconds)
+      )
+  ).protocols(httpProtocol)
+}

src/gatling/scala/simulations/LoadTestSimulation.scala

@@ -0,0 +1,25 @@
+package simulations
+
+import base.BaseSimulation
+import scenarios.ChessUserScenario
+import io.gatling.core.Predef._
+import io.gatling.http.Predef._
+
+import scala.concurrent.duration._
+
+class LoadTestSimulation extends BaseSimulation {
+
+  private val maxUsers     = sys.props.getOrElse("maxUsers", "5").toInt
+  private val rampDuration = sys.props.getOrElse("rampDuration", "60").toInt
+
+  // Each virtual user authenticates individually, so no global Bearer token
+  override protected val httpProtocol = http
+    .baseUrl(baseUrl)
+    .header("Accept", "application/json")
+    .header("Content-Type", "application/json")
+
+  setUp(
+    ChessUserScenario.play
+      .inject(rampUsers(maxUsers).during(rampDuration.seconds))
+  ).protocols(httpProtocol)
+}

src/gatling/scala/simulations/SmokeTestSimulation.scala

@@ -0,0 +1,19 @@
+package simulations
+
+import base.BaseSimulation
+import scenarios.ChessUserScenario
+import io.gatling.core.Predef._
+import io.gatling.http.Predef._
+
+class SmokeTestSimulation extends BaseSimulation {
+
+  override protected val httpProtocol = http
+    .baseUrl(baseUrl)
+    .header("Accept", "application/json")
+    .header("Content-Type", "application/json")
+
+  setUp(
+    ChessUserScenario.play
+      .inject(atOnceUsers(1))
+  ).protocols(httpProtocol)
+}

src/gatling/scala/simulations/SpikeTestSimulation.scala

@@ -0,0 +1,30 @@
+package simulations
+
+import base.BaseSimulation
+import scenarios.ChessUserScenario
+import io.gatling.core.Predef._
+import io.gatling.http.Predef._
+
+import scala.concurrent.duration._
+
+class SpikeTestSimulation extends BaseSimulation {
+
+  private val baselineUsers    = sys.props.getOrElse("baselineUsers", "2").toInt
+  private val baselineDuration = sys.props.getOrElse("baselineDuration", "20").toInt
+  private val spikeUsers       = sys.props.getOrElse("spikeUsers", "15").toInt
+
+  override protected val httpProtocol = http
+    .baseUrl(baseUrl)
+    .header("Accept", "application/json")
+    .header("Content-Type", "application/json")
+
+  setUp(
+    ChessUserScenario.play
+      .inject(
+        constantUsersPerSec(baselineUsers).during(baselineDuration.seconds),
+        atOnceUsers(spikeUsers),
+        nothingFor(5.seconds),
+        constantUsersPerSec(baselineUsers).during(baselineDuration.seconds)
+      )
+  ).protocols(httpProtocol)
+}

src/gatling/scala/simulations/StressTestSimulation.scala

@@ -0,0 +1,33 @@
+package simulations
+
+import base.BaseSimulation
+import scenarios.ChessUserScenario
+import io.gatling.core.Predef._
+import io.gatling.http.Predef._
+
+import scala.concurrent.duration._
+
+class StressTestSimulation extends BaseSimulation {
+
+  private val startUsers     = sys.props.getOrElse("startUsers", "2").toInt
+  private val usersIncrement = sys.props.getOrElse("usersIncrement", "2").toInt
+  private val steps          = sys.props.getOrElse("steps", "2").toInt
+  private val stepDuration   = sys.props.getOrElse("stepDuration", "30").toInt
+  private val rampDuration   = sys.props.getOrElse("rampDuration", "10").toInt
+
+  override protected val httpProtocol = http
+    .baseUrl(baseUrl)
+    .header("Accept", "application/json")
+    .header("Content-Type", "application/json")
+
+  setUp(
+    ChessUserScenario.play
+      .inject(
+        incrementConcurrentUsers(usersIncrement)
+          .times(steps)
+          .eachLevelLasting(stepDuration.seconds)
+          .separatedByRampsLasting(rampDuration.seconds)
+          .startingFrom(startUsers)
+      )
+  ).protocols(httpProtocol)
+}