Testing Framework

Juno uses Jest for unit and snapshot testing. Test coverage is focused on pure functions, UI rendering, and signal logic — not end-to-end flows.

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Structure

Test files live in:

/tests/

And colocated *.test.ts(x) files inside component folders.

Tests cover:

• Utility functions (formatUsd, truncateAddress, timeAgo, etc)

• Signal generation logic (generateSignal, scoreConfidence)

• Component render stability (e.g. WalletTokenTable, SignalFeed)

• Snapshot diffs for key UI components

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Setup

• jest.config.js defines the environment (jsdom)

• jest.setup.js loads @testing-library/jest-dom

• ts-jest handles TypeScript transforms

• testMatch is scoped to /tests/**/*.test.(ts|tsx)

No mocks unless needed. No global test data. Tests are atomic and reproducible. If it breaks, you’ll see exactly where.

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Tests are lightweight, fast, and intended to catch regressions on render or logic. No need for full-blown browser automation, this stays focused.