What is the difference between functional and load testing in SOAP UI?

Functional Testing in SOAP UI :

  • Focus: Verifies that the API behaves as expected under normal conditions. It checks if the API performs its intended functions correctly.
  • Scope: Tests individual functionalities, such as:
    • Correctness of data processing
    • Proper handling of different input scenarios
    • Validation of responses (status codes, data format, etc.)
    • Authentication and authorization mechanisms
  • Techniques:
    • Creating TestCases with TestSteps (Request, Response, Assertions)
    • Data-driven testing using Data Sources
    • Verifying expected outcomes using Assertions (XPath Match, Script Assertions)
  • Goal: Identify bugs, defects, and unexpected behavior in the API's functionality.
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Load Testing in SOAP UI :

  • Focus: Evaluates the performance of the API under heavy load. It determines how the API behaves when multiple users access it concurrently.
  • Scope: Tests the API's ability to handle a large number of requests simultaneously. It assesses:
    • Response times under different load levels
    • System stability and resource utilization
    • Potential bottlenecks and performance degradation
  • Techniques:
    • Creating LoadTests from existing TestCases
    • Simulating multiple virtual users
    • Monitoring key performance indicators (KPIs) like response times, throughput, and error rates
  • Goal: Identify performance bottlenecks, ensure scalability, and optimize the API for high traffic.