Terminal

Test Runner

Simulates a watch-mode test runner: spec suites stream in with green PASS ticks, one flaky spec fails red then retries and recovers, a live pass/fail tally and per-suite timings update in real time, and the run closes with a Stmts/Branch/Funcs/Lines coverage table before restarting on a loop.

csslight complexitymoderate motion

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Live demo — the real component, running in a sandbox. One self-contained HTML file, zero dependencies. Open it on the canvas →

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When to use it

Developer-tool landing pages, CI/testing dashboards, loading screens, or any terminal-aesthetic hero that needs a credible "tests are running" ambient backdrop.

When not to

Light-background UIs (background is hardcoded dark #0d1117) and non-technical audiences for whom spec output and coverage percentages carry no meaning.

Working with an AI agent

Every component ships agent-ready metadata. An example instruction for this one:

Add a suite {f:'payments/refund.spec.ts', ms:190, specs:['issues a full refund','rejects a double refund']} to the suites array, change the flaky spec's assertion message, and slow the per-spec streaming from 95ms to 160ms.

Safe to edit

suite/spec data (suites array: file names, per-suite ms, spec descriptions, flaky index)
coverage table rows and percentages (cov array)
per-spec / per-suite streaming delays (sleep 95/170ms and retry 280/300ms)
max visible lines (MAX=30)
loop restart pause (sleep 2800ms)
accent and level colors (.ttr-ok/.ttr-warn/.ttr-err CSS)

Keep intact

IIFE with "use strict"
visibilitychange running-flag stop/resume guard
prefers-reduced-motion staticFrame() early-return path
role=img + aria-label on the wrapper and aria-hidden corner caption
live tally element updated via tally()

Known limitations

Background and terminal palette are hardcoded dark — must edit CSS to re-theme
Not themeable: exposes no --pro-* custom-property block
Purely ambient with no click interactivity
With justify-content:flex-end older lines scroll out of view on short viewports; only the newest MAX lines render

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