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Testing Link Header Pagination Extraction in OpenHands

This test suite validates the extractNextPageFromLink utility function which parses GitHub API pagination links to extract the next page number. The tests verify correct handling of link headers with various pagination scenarios and edge cases.

Test Coverage Overview

The test suite provides comprehensive coverage of the link header parsing functionality.

Key areas tested include:

Standard link header with prev, next, first and last pages
Link header without a next page reference
Link header with different URL parameter structures

Integration points focus on GitHub API pagination compatibility.

Implementation Analysis

The testing approach uses Vitest’s test framework with expect assertions to validate the link parsing logic.

The implementation follows AAA (Arrange-Act-Assert) pattern and leverages string parsing to extract pagination information. Key test patterns include positive testing with complete link headers and negative testing with missing next links.

Technical Details

Testing stack includes:

Vitest as the test runner
Jest-style expect assertions
TypeScript for type safety
Unit test isolation

Best Practices Demonstrated

The test suite demonstrates several testing best practices:

Clear test case organization
Comprehensive edge case coverage
Focused unit test scope
Descriptive test naming
Efficient test data setup

all-hands-ai/openhands

frontend/__tests__/utils/extract-next-page-from-link.test.ts

            
import { expect, test } from "vitest";
import { extractNextPageFromLink } from "#/utils/extract-next-page-from-link";

test("extractNextPageFromLink", () => {
  const link = `<https://api.github.com/repositories/1300192/issues?page=2>; rel="prev", <https://api.github.com/repositories/1300192/issues?page=4>; rel="next", <https://api.github.com/repositories/1300192/issues?page=515>; rel="last", <https://api.github.com/repositories/1300192/issues?page=1>; rel="first"`;
  expect(extractNextPageFromLink(link)).toBe(4);

  const noNextLink = `<https://api.github.com/repositories/1300192/issues?page=2>; rel="prev", <https://api.github.com/repositories/1300192/issues?page=1>; rel="first"`;
  expect(extractNextPageFromLink(noNextLink)).toBeNull();

  const extra = `<https://api.github.com/user/repos?sort=pushed&page=2&per_page=3>; rel="next", <https://api.github.com/user/repos?sort=pushed&page=22&per_page=3>; rel="last"`;
  expect(extractNextPageFromLink(extra)).toBe(2);
});