Testing Data Visualizations

Overview

Use this skill when the main question is how to verify a visualization, not just how to render one. Testing charts means protecting analytical truth, interaction behavior, rendering stability, and product integration without turning every pixel into a brittle contract.

Default assumption: use the smallest test mix that catches wrong numbers, broken interactions, and obvious visual regressions. Favor deterministic fixtures and targeted image baselines over giant snapshot suites.

Choose This Skill When

• the user asks how to test a chart, dashboard, or visualization component
• screenshot testing, image diffing, or visual regression is the main concern
• the user needs help deciding what to mock and where to mock it
• the question is about unit versus component versus E2E coverage
• a live dashboard, export flow, or embedded chart needs QA strategy
• the user wants help trimming a brittle or overgrown chart test suite

Working Pattern