Using ChatGPT for Generating Test Data in Stress and Load Testing

ChatGPT open on a smartphone

In software development, making sure that applications can handle a ton of stress and load is super important. Stress and load testing help developers figure out the limits of their systems, ensuring they perform reliably when things get busy. Traditionally, generating all the test data needed for these tests can be a tedious and time-consuming task. But now, with AI tools like ChatGPT, this process can be a lot easier and more efficient. Let's dive into how ChatGPT can make generating test data for stress and load testing a breeze.

What's stress and load testing anyway?

Both stress and load testing are a subset of testing activities that fall under performance testing.

Before we get into the nitty-gritty, let’s quickly recap what stress and load testing are all about:

Stress testing is all about pushing your system to its breaking point. You want to see how it handles extreme conditions like super high traffic or massive data loads. The goal?  To find out where it starts to crumble and how gracefully it can recover from failure.

For example, imagine an e-commerce website during Black Friday sales. The traffic spikes massively compared to regular days. Stress testing beforehand helps ensure the website doesn't crash during peak times, maintaining customer trust and preventing potential revenue loss.

Load testing is more about everyday scenarios. You test your system under expected usage conditions to ensure it can handle typical traffic and identify any potential bottlenecks. This helps in verifying the system's performance and stability under normal operational load.

For example, consider a new banking application that is expected to handle a certain number of transactions per hour. Load testing can simulate this expected usage to ensure the application runs smoothly for all users during regular banking hours, avoiding slowdowns or service interruptions.

Why load and stress testing matter—Key statistics from industry giants

Person holding phone with screen that reads loading, please wait

Without stress and load testing, systems can fail under unexpected conditions, leading to poor user experiences, loss of business, and damage to a company's reputation. By conducting these tests, businesses can identify and fix potential issues before they affect end users, ensuring reliability and satisfaction. Here are some eye-opening statistics from major companies that highlight their critical role:

  • Google: According to Google, 53% of mobile site visitors leave a page that takes longer than three seconds to load. Additionally, a one-second delay in mobile load times can impact mobile conversions by up to 20%.
  • Amazon: Amazon has reported that a 100ms increase in page load time led to a 1% decrease in sales. This highlights how even minor delays can have significant financial implications for e-commerce giants.
  • Walmart: Walmart found that for every 1-second improvement in page load time, conversions increased by 2%. This demonstrates the direct correlation between performance optimization and revenue growth.
  • Akamai: A study by Akamai showed that a two-second delay in web page load time can increase bounce rates by 103%. This underscores the critical need for efficient load handling.
  • BBC: The BBC discovered that they lost an additional 10% of users for every additional second their site took to load. This illustrates the importance of maintaining quick load times to retain user engagement.

These statistics from industry leaders clearly illustrate the tangible benefits of robust performance, load, and stress testing practices. Ensuring your system can handle both expected and extreme conditions is not just about providing a good user experience—it's essential for maintaining revenue and competitive edge in today's digital landscape.

The test data generation challenge

Creating realistic test data for stress and load testing involves generating huge amounts of data that mimic real-world usage. This data has to cover various scenarios and edge cases to give you a full picture of your system's performance. Traditionally, this can be a real hassle—manual, repetitive, and prone to mistakes.

Typically, test data generation often involves manually creating datasets or using basic scripts to simulate user behavior. This method is time-consuming and requires significant effort to ensure the data is comprehensive and accurate. Testers have to consider numerous variables, such as user demographics, transaction types, and peak usage times, making the process complex and error-prone.

However, modern approaches are revolutionizing this process. For instance, tools powered by AI, like ChatGPT, can automate and streamline the generation of realistic test data. These tools can quickly produce large volumes of diverse and accurate data by understanding the context and requirements of different scenarios. This not only saves time but also reduces the likelihood of errors, ensuring a more robust and thorough testing process.

How ChatGPT can help generate test data (examples)

ChatGPT from OpenAI is a powerful tool that can understand and generate human-like text based on prompts. According to OpenAI, ChatGPT-4, the latest version, has been trained on an unprecedented dataset comprising hundreds of billions of words. This extensive training enables ChatGPT to produce highly accurate and contextually relevant text, making it an invaluable asset for generating realistic test data.

Here’s how ChatGPT  can help with test data generation:

1. Automated data generation 

ChatGPT can churn out large volumes of synthetic test data quickly. Just give it specific prompts and it can create diverse datasets reflecting different user interactions and behaviors. For instance, generating data for thousands of login attempts or transaction records can be done in no time. 

Here is an example of a prompt for data generation:

Generate 1000 records of user login attempts with the following fields: 

  • Username: random string
  • Password: random string
  • Timestamp: random date and time within the last year
  • Status: success or failure

And here is an example of the output:


2. Customizing data formats 

You can tell ChatGPT exactly how you want your data formatted. It can generate data in JSON, CSV, XML, or whatever format you need, ensuring it fits right into your testing setup.

Here is an example of a prompt for customized data formats:

Generate 200 JSON objects representing API requests with the following fields:

  • RequestID: random UUID
  • UserID: random integer
  • Action: random action (create, update, delete)
  • Timestamp: random date and time within the last week
  • Status: success or error

And here is an example of the output:


3. Covering edge cases 

Edge cases can be tricky but are super important. ChatGPT can help generate test data that includes these less common but critical scenarios, such as max and min input values or special characters.

Here is an example of a prompt that considers edge cases:

Generate 50 records of form submissions with the following fields:

  • Username: random string including special characters
  • Email: random valid and invalid email formats
  • Age: random integer between -10 and 150
  • Timestamp: random date and time within the last year
  • Status: success or error

And here is an example of the output:


4. Iterate and improve 

ChatGPT works best when you engage in a bit of back-and-forth. You can refine your prompts based on the responses you get, improving the quality of your test data over time.

Pros and cons of using ChatGPT for test data generation

While ChatGPT can be a game-changer for generating test data, it’s important to consider both the advantages and potential drawbacks.


  • Speed and efficiency. ChatGPT can generate large volumes of data quickly, saving you time and effort.
  • Versatility. It can create a wide range of data types and scenarios, ensuring comprehensive test coverage.
  • Customizable. You can specify the format and structure of the data to match your testing needs.
  • Edge case coverage. ChatGPT can help identify and generate data for rare and critical edge cases.
  • Iterative improvement. Continuous refinement of prompts can lead to increasingly accurate and useful data generation.


  • Quality control. The generated data might not always be perfect, and manual verification is still needed to ensure accuracy.
  • Dependence on prompts. The effectiveness of ChatGPT depends heavily on how well you craft your prompts. Vague or poorly defined prompts can lead to suboptimal data.
  • Security concerns. Handling sensitive data with AI tools requires caution to avoid potential data breaches or misuse.
  • Learning curve. There’s a bit of a learning curve to using ChatGPT effectively, particularly in crafting precise prompts and iterating on responses.
  • Resource intensive. Running large models like ChatGPT can be computationally expensive and might require significant resources.

Wrapping up

Using ChatGPT for generating test data for stress and load testing can save you a ton of time and effort. It automates data generation, creates realistic scenarios, customizes data formats, covers edge cases, and allows for continuous improvement. This means you can focus more on analyzing results and less on preparing data, leading to more reliable and robust software systems.

Embracing AI tools like ChatGPT can really streamline your testing processes and open up new possibilities in software development. So, next time you’re gearing up for a round of stress or load testing, give ChatGPT a try and see how it can make your life a whole lot easier. 

It’s your move

Want to streamline your software testing efforts and see how your software handles high traffic volumes, large data processing, or other stress conditions? Get in touch and let’s discuss how we can help you.  

It's also worth checking out Loadero, a robust software testing solution specialized in performance and load testing for web applications. With Loadero, businesses can proactively test and optimize their systems to deliver exceptional user experiences under various conditions.

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