API Testing Lecture 5
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Questions and Answers

What is the default address to access the Locust interface?

  • <a href="http://localhost:9000">http://localhost:9000</a>
  • <a href="http://localhost:8089">http://localhost:8089</a> (correct)
  • <a href="http://localhost:5000">http://localhost:5000</a>
  • <a href="http://localhost:8000">http://localhost:8000</a>

    • What is the primary purpose of the spawn rate in load testing?

  • To control the rate at which virtual users are generated (correct)
  • To set the host URL for the application
  • To start the load test
  • To determine the total number of users

    • What is the result of clicking 'Start Swarming' in the Locust interface?

  • The load test is reset
  • The load test is paused
  • The load test is started (correct)
  • The load test is stopped

    • What information is provided in real-time during a load test?

    <p>The number of requests, response times, failure rates, and more</p> Signup and view all the answers

    What is the purpose of defining the host URL in the Locust interface?

    <p>To specify the base URL of the application being tested</p> Signup and view all the answers

    What happens if you specify a spawn rate of 10 users per second and you want to simulate a total of 100 users?

    <p>It will take 10 seconds for all 100 users to be active</p> Signup and view all the answers

    What is the total users parameter in Locust?

    <p>The total number of virtual users you want to simulate during the load test</p> Signup and view all the answers

    What is the purpose of the Locust web interface?

    <p>To configure and run a load test</p> Signup and view all the answers

    What is the outcome of simulating a large number of users on an application?

    <p>The application's performance will be tested under load</p> Signup and view all the answers

    What is the benefit of using Locust for load testing?

    <p>It allows you to simulate a large number of users and test the application's performance under load</p> Signup and view all the answers

    Study Notes

    UI Testing

    • Focuses on verifying interactions between the User Interface (UI) and backend APIs
    • Ensures the UI displays correct data received from the API
    • Confirms the UI correctly sends requests to the API when a user performs an action
    • Checks that the API responds appropriately to these requests and the UI correctly handles the responses

    Testing Scenarios

    • Valid Operations: Testing UI actions that are expected to work
    • Error Handling: Testing how the UI displays error messages when an API call fails
    • Dynamic Interactions: Testing dynamic content, such as loading data without a full page refresh

    Tools and Methods

    • Automated Testing Frameworks: Tools like Selenium, Cypress, or Appium automate UI tests by simulating user interactions
    • Manual Testing: Human testers interact with the UI to identify issues that automated tests might miss

    UI Testing Scenario

    • Write tests that interact with the web pages as a user would
    • Use Selenium WebDriver to automate browser actions like clicking, typing, and navigating
    • Create a fixture in pytest to initialize and tear down the WebDriver
    • Use driver.find_element(By.XXX, 'value') to locate elements
    • Use methods like send_keys() to type into fields and click() to click buttons
    • Use assertions to verify the UI behaves as expected

    Load Testing

    • Evaluates the behavior and performance of a system under a specific expected load
    • Identifies the maximum operating capacity of an application and bottlenecks
    • Determines if the system can sustain the expected load over a prolonged period

    Purpose of Load Testing

    • Assesses scalability
    • Identifies bottlenecks
    • Evaluates stability and endurance
    • Verifies compliance with performance goals and service level agreements (SLAs)

    Key Components of Load Testing

    • Virtual Users (VUs): Simulated users that interact with the system
    • Workload Model: A representation of the expected load on the system
    • Test Scenarios: Specific user paths and interactions with the system tested under load
    • Metrics and KPIs: Key performance indicators like response time, throughput, error rates, and resource utilization metrics

    Process of Load Testing

    • Planning: Define objectives, scope, environment, tools, and success criteria
    • Design: Create test scenarios that realistically mimic user behavior and workload expectations
    • Environment Setup: Configure the test environment to replicate the production setting
    • Execution: Run the tests, monitor the system, and gather data
    • Analysis: Analyze the results to identify performance issues, bottlenecks, or deviations from the expected outcomes
    • Optimization: Make necessary optimizations or changes to the system
    • Retesting: Re-run tests to confirm the changes have had the desired effect on system performance

    Tools for Load Testing

    • Apache JMeter: An open-source Java application for load testing and measuring performance
    • Locust: An open-source load testing tool where you define user behavior with Python code
    • Gatling: A powerful open-source load and performance testing tool designed for ease of use

    Load Testing Scenario

    • Simulate multiple users attempting to register at the same time
    • Use Locust to define user behavior with Python code and swarm the system with millions of simultaneous users

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    Quiz Team

    Description

    Learn about UI testing in API testing, a quality assurance practice that verifies interactions between the UI and backend APIs.

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