Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/bklit/bklit-ui/unit-testsnpx skills add bklit/bklit-ui --skill unit-testsgit clone --depth 1 https://github.com/bklit/bklit-uiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/bklit/bklit-ui/unit-tests)<a href="https://agentmods.dev/skills/bklit/bklit-ui/unit-tests"><img src="https://agentmods.dev/badge/skills/bklit/bklit-ui/unit-tests.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00054 | $0.01025 |
| Opus 5 | $0.00027 | $0.00513 |
| Sonnet 5 | $0.00011 | $0.00205 |
| Haiku 4.5 | $0.00005 | $0.00103 |
Grade A, and why
unit-tests scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Unit Tests (bklit-ui)
Read this skill before proposing or writing tests. Default stance: fewer, higher-signal tests.
When to add tests
Add tests when they lock in behavior that is easy to break silently:
| Worth testing | Why |
|---|---|
| Pure functions / modules | Stable inputs → outputs; fast; no DOM |
| Formatters, parsers, scale math, bounds | Regression on string/number output is user-visible |
| Codegen / export / registry helpers | Output shape is the contract |
| Non-obvious edge cases | Empty data, reversed ranges, clamping |
Examples in this repo: chart-formatters.test.ts, highlight-segment-bounds.test.ts, animation.test.ts, apps/web/lib/studio/__tests__/*.
When NOT to add tests (unless explicitly requested)
Do not add tests just to increase coverage or “be thorough”:
| Skip | Why |
|---|---|
| React component render smoke tests | visx, motion, portals → brittle; manual/docs check is cheaper |
memo() / guard extractions (#65-style) |
Structural perf refactors; output unchanged; RTL mount assertions are heavy |
| Default prop passthrough | formatValue = intFmt — types + formatter tests cover it |
| Third-party library behavior | Don’t re-test d3, visx, or React |
| Trivial getters / one-line wrappers | No regression signal |
| Snapshot entire chart SVG/JSX | High churn, low signal |
If the user asks “should we test X?” — say no when X falls in this table, and suggest a lighter alternative (pure helper test, manual check, CI build).
Repo conventions
Runner: Node built-in test runner + tsx (not Jest/Vitest unless the repo adopts them later).
pnpm test # root — turbo runs packages with a test script
pnpm --filter @bklitui/ui test
cd apps/web && pnpm test
Place tests: **/__tests__/**/*.test.ts next to the code under test.
Pattern:
import assert from "node:assert/strict";
import { describe, it } from "node:test";
import { myFn } from "../my-module";
describe("myFn", () => {
it("handles empty input", () => {
assert.equal(myFn([]), expected);
});
});
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 112 lines · 54 tokens per session scan A b9b41db323b9
unit-tests is a skill published in the GitHub repository bklit/bklit-ui (1,596 stars, last pushed 1mo ago), licensed MIT. It adds 54 tokens to every session and 1,025 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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