# Demo Project for Online Stream #46 - Gatling Performance Tests

Demo project for online YouTube stream #46 about using Gatling tool for performance testing of backend microservice.

This project contains a Gatling performance test for the backend service located in the backend-service-under-test folder. The test simulates various user loads and interactions with the service's API endpoints.

Access to Online Stream on YouTube

You can view the online stream on YouTube after making a donation to support my volunteering initiative to help Ukrainian Armed Forces.

☕ Please, visit the Buy Me a Coffee.

Thank you in advance for your support! Слава Україні! 🇺🇦

View the announcement of the online stream on YouTube:

Simulation Details

The only simulation in this project, GetProductsSimulation, performs the following actions:

1. GET /products: Retrieves a list of products filtered by price and size.
2. GET /products/{id}: Retrieves details of a random product from the list obtained in the previous step.
3. PUT /products/{id}: Updates the stock of the retrieved product.

Injection Steps

The simulation includes different user load patterns:

• nothingFor(Duration.ofSeconds(2)): No users for the first 2 seconds.
• atOnceUsers(100): 100 users at once.
• rampUsers(100).during(5): 100 users ramping up over 5 seconds.
• constantUsersPerSec(300).during(80): 300 users per second for 80 seconds.
• constantUsersPerSec(300).during(10).randomized(): 300 users per second for 10 seconds with randomized intervals.
• stressPeakUsers(1000).during(15): 1000 users over 15 seconds.

Prerequisites

Ensure that the backend service is running before executing the Gatling test. The backend project can be found in the backend-service-under-test folder. Follow the instructions in the backend-service-under-test README to start the service.

Running the Simulation

To run the simulation using the Gradle wrapper, use the following command:

./gradlew gatlingRun

This command will execute the GetProductsSimulation and generate a report of the performance test results.

Configuration

The gatling.conf file contains the following settings:

gatling.charting.indicators.lowerBound=200
gatling.charting.indicators.higherBound=500

These settings define the lower and higher bounds for charting indicators in the generated reports.

Building the Project

To build the project, use the following command:

./gradlew build

This will compile the Java sources and prepare the project for running the simulation.

License

This project is licensed under the MIT License.