When should I use overrides vs assertions?

Use overrides for read operations (GET) where parameters affect the returned data. Use assertions (recordRequests) for mutations like create, update, or delete operations.

Do I need to manually clear mocks after each test?

No, all overrides are automatically reset before each test to ensure test isolation and prevent side effects between test cases.

What is a conditional override?

A conditional override is a mechanism that allows a mock API to return different data based on specific request properties, such as query parameters or headers, rather than returning a static fixture.

What are reusable scenarios?

Scenarios are predefined overrides defined at the fixture level that can be activated by name, preventing the need to duplicate complex mock logic across multiple test files.

How do I simulate a server error with this skill?

You can use the .overrideHandler() method to return a specific HttpResponse with an error status code like 500 or simulate a network failure.

API Testing Overrides

Name: API Testing Overrides
Author: stacklok

bystacklok

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Security & Testing

Validates application behavior by dynamically overriding API responses based on request parameters like query strings and headers.

This skill provides a specialized framework for testing how your application handles varying API responses without relying on brittle implementation checks. By using conditional overrides, you can verify that components correctly render data when filtering, sorting, or paginating. It enables developers to define custom responses for specific request predicates including query params, path segments, request bodies, or headers, ensuring that tests reflect real-world user experiences while maintaining clean, maintainable mock data across test suites.

Key Features

0181 GitHub stars

02Predicate-based logic for granular control over API mock behavior

03Conditional response overrides based on query params, path, and request body

04Support for error state simulations and network failure testing

05Chaining multiple overrides to handle complex test scenarios

06Reusable scenarios to standardize mock behavior across multiple test files

Use Cases

01Testing UI components with filtered, sorted, or paginated data sets

02Verifying empty state handling when APIs return no results for specific queries

03Simulating server-side errors or network failures to test frontend resilience

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add stacklok/toolhive-studio testing-api-overrides

For use in Claude.ai and ChatGPT

Download Skill