Testing #

Unit tests first #

@inglorious/charts already has Vitest coverage for:

• chart renderers
• components (grid, legend, tooltip, axes, brush)
• data and layout utilities

See /packages/charts/src/**/*.test.js.

Add e2e where needed #

Use Playwright only for browser-specific assertions:

• tooltip positioning in real layout
• pointer interactions and hover behavior
• visual layering regressions

For most chart logic, unit tests are enough and faster.