Load Testing with Locust

Load test web applications with Locust: users and tasks, wait times, events, HTTP requests, response validation, step load and distributed mode.

Lessons

• Why Load Testing ?
  • What is Load Testing?
  • Why is Load Testing Important?
  • Real-Time Load Testing Examples
  • Key Metrics to Monitor in Load Testing
  • Best Practices for Effective Load Testing
• Locust Installation
  • Prerequisites
  • Step 1: Install Python (If Not Already Installed)
  • Step 2: Create a Virtual Environment (Recommended)
  • Step 3: Install Locust
  • Step 4: Set up a Simple Locust Test
• Understanding Locust Wait Times with Complete Examples
  • What Are Wait Times in Locust?
  • FastAPI App Overview
  • 1. Constant Wait Time Example
  • 2. Between wait time Example
  • 3. Custom Wait Time Example
  • Full Test Example
  • Running Locust for FastAPI
• Simulating Multiple User Types in Locust
  • Why Use Multiple User Types?
  • Understanding User Classes and Weights
  • Example: Simulating Web and Mobile Users
  • How Locust Uses Weights
  • Running the Locust Test
• Why on_start and on_stop are Essential for Locust Users
  • What Are on_start and on_stop?
  • Why Use on_start and on_stop?
  • Examples
• How to use test_start and test_stop Events in Locust
  • What Are test_start and test_stop?
  • Why Use test_start and test_stop?
  • Example: Basic Usage of test_start and test_stop
  • Example: Logging Test Details
• @task decorator
  • What Is the @task Decorator?
  • Example: Printing DateTime and a Greeting
  • Fine-Tuning Tasks with Weights
• task attribute
  • What Is task_attribute?
  • Use Cases for task_attribute
  • Example: Using task_attribute
  • Explanation of the Code
  • Accessing task_attribute at Runtime
• Sequential Task Set
  • What Is SequentialTaskSet?
  • Example: Sequential Task Execution
  • Explanation of the Code
  • Benefits of SequentialTaskSet
• HTTP Load Testing with Locust's HttpUser
  • What Is HttpUser?
  • Example: HTTP GET Request with HttpUser
  • Enhancing the Example: Error Handling
  • Adding Headers and Query Parameters
• Load Testing with HTTP POST Requests in Locust
  • Understanding HTTP POST in Load Testing
  • Example: Performing POST Requests with Locust
• Using catch_response in Locust for Custom Response Validation
  • Example Code: Validating a Response Using catch_response
  • Breakdown of the Code
  • Why Use catch_response?
  • Sample Output
  • When to Cache Responses?
  • Enhancements and Next Steps
• Iterative Load Testing with Step Size in Locust
  • Why Use Step-Load Testing?
  • Example Code: Step-Load with Locust
  • How the Step-Load Works
• Enhancing Your Locust Tests with Custom Logging
  • Why Use Logging in Locust?
  • Setting Up Logging in Locust
  • Example: Logging in a Locust Test
  • Breakdown of the Code
  • Running the Test
• Running Locust in Distributed Mode with Master and Workers
  • Why Distributed Testing?
  • Locust Distributed Architecture
  • Setting Up Locust in Distributed Mode
  • Step 1: Prepare Your Locust Script
  • Step 2: Start the Master Node
  • Step 3: Start the Worker Nodes
  • Step 4: Control the Test
  • Key Parameters
  • Scaling the Test
  • Example: Running on Docker
  • Monitoring Distributed Tests
  • Tips for Distributed Locust