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Create a load test for Azure Functions

Learn how to create a load test for an app in Azure Functions with Azure Load Testing. In this article, you'll learn how to create a URL-based load test for your function app in the Azure portal, and then use the load testing dashboard to analyze performance issues and identify bottlenecks.

With the integrated load testing experience in Azure Functions, you can:

  • Create a URL-based load test for functions with an HTTP trigger
  • View the load test runs associated with a function app
  • Create a load testing resource

Prerequisites

  • An Azure account with an active subscription. If you don't have an Azure subscription, create a free account before you begin.
  • A function app with at least one function with an HTTP trigger. If you need to create a function app, see Getting started with Azure Functions.

Create a load test for a function app

You can create a URL-based load test directly from your Azure Function App in the Azure portal. You can either create by entering your HTTP requests directly in portal or by uploading a JMeter or Locust test script.

To create a load test for a function app:

  1. In the Azure portal, go to your function app.

  2. On the left pane, select Load Testing (Preview) under the Performance section.

    On this page, you can see the list of tests and the load test runs for this function app.

    Screenshot that shows Load Testing page in an app in Azure Functions.

  3. Select Create test to start load test for the function app. Select Create a URL-based test if you don't have a test script. Select Upload a script if you have a JMeter or Locust test script.

    1. On the Create test page, first enter the test details:

      Field Description
      Load Testing Resource Select your load testing resource. Create new if you don't have one in the Azure subscription.
      Test name Enter a unique test name.
      Test description (Optional) Enter a load test description.
      Run test after creation When selected, the load test starts automatically after creating the test.

  4. For a URL-based test, select Add request to add HTTP requests to the load test:

    On the Add request page, enter the details for the request:

    Field Description
    Request name Unique name within the load test to identify the request. You can use this request name when defining test criteria.
    URL Select the base URL for the HTTP endpoint
    Path (Optional) Enter a URL path name within the HTTP endpoint. The path is appended to the URL to form the endpoint that is load tested.
    HTTP method Select an HTTP method from the list. Azure Load Testing supports GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS.
    Query parameters (Optional) Enter query string parameters to append to the URL.
    Headers (Optional) Enter HTTP headers to include in the HTTP request.
    Body (Optional) Depending on the HTTP method, you can specify the HTTP body content. Azure Load Testing supports the following formats: raw data, JSON view, JavaScript, HTML, and XML.

    Learn more about adding HTTP requests to a load test.

  5. For a script-based test, upload your test script in the Test plan tab. Learn more about creating a test by uploading a test script.

  6. After entering all the required details, select Review + create to review the test configuration, and then select Create to create the load test.

    Azure Load Testing now creates the load test. If you selected Run test after creation previously, the load test starts automatically.

View test runs

You can view the list of test runs and a summary overview of the test results directly from within the function app configuration in the Azure portal.

  1. In the Azure portal, go to your Azure Function App.

  2. On the left pane, select Load testing.

  3. In the Test runs tab, you can view the list of test runs for your function app.

    For each test run, you can view the test details and a summary of the test outcome, such as average response time, throughput, and error state.

  4. Select a test run to go to the Azure Load Testing dashboard and analyze the test run details.

    Screenshot that shows the test runs list for an app in Azure Functions.

Next steps