test: add Jest test suite with 46 tests across contract utils, API routes, and components

[Copilot]

The codebase had zero test coverage — no framework, no test files, no test scripts.

Test infrastructure

• Added jest, jest-environment-jsdom, @testing-library/react, @testing-library/jest-dom, @types/jest
• jest.config.js via next/jest (SWC transform, @/ path alias, per-file environment overrides)
• jest.setup.ts loads jest-dom matchers
• test and test:coverage scripts in package.json

Test suites

Suite	Tests	Focus
__tests__/lib/contract.test.ts	16	All 6 exported functions; mocks fetch for getCurrentDelegation error and success paths
__tests__/api/delegation-example.test.ts	12	POST handler actions (delegate, undelegate, unknown); isValidAddress edge cases (too short/long, non-hex, mixed-case); malformed body → 500
__tests__/api/frame-image.test.ts	10	GET handler status/headers; SVG structure; all 4 action variants; unknown action fallback; delegate address interpolation
__tests__/components/GridCard.test.tsx	8	handleStatus for all 6 execution-status values plus empty string and unknown value

API route tests use @jest-environment node to get the Web Fetch API Request available in the Node.js runtime (required by NextRequest); component tests use the default jsdom environment.

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Project	Deployment	Actions	Updated (UTC)
ecosystem-contributions	Ready	Preview, Comment	May 21, 2026 2:09am

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