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- 51 headless Web Components (45 core + 6 animation) - Shared helpers: emit(), part(), listen(), wireLabel(), initialValue() - Zero `new CustomEvent` or `static #counter` — all use shared utils - Zod schemas for all 44 core components - MCP package with discover, inspect, compose, validate tools - Showcase with Aperture Science theme, M3 Expressive motion - 81 tests passing, TypeScript strict mode clean - Signals (~500B), SPA router (~400B), zero dependencies
66 lines
2.2 KiB
TypeScript
66 lines
2.2 KiB
TypeScript
import { describe, it, expect, beforeEach } from "vitest";
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import { part, emit, initialValue, listen, wireLabel } from "../src/shared/helpers";
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describe("shared helpers", () => {
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beforeEach(() => { document.body.replaceChildren(); });
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it("part() finds child by data-part attribute", () => {
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const host = document.createElement("div");
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const child = document.createElement("input");
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child.dataset.part = "control";
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host.appendChild(child);
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expect(part(host, "control")).toBe(child);
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expect(part(host, "missing")).toBeNull();
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});
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it("emit() dispatches a bubbling petty-prefixed event", () => {
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const el = document.createElement("div");
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document.body.appendChild(el);
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let received: { value: unknown } | null = null;
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document.body.addEventListener("petty-change", (e) => { received = (e as CustomEvent).detail; });
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emit(el, "change", { value: "test" });
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expect(received).toEqual({ value: "test" });
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});
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it("initialValue() reads default-value then value then empty", () => {
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const el = document.createElement("div");
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expect(initialValue(el)).toBe("");
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el.setAttribute("value", "v");
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expect(initialValue(el)).toBe("v");
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el.setAttribute("default-value", "dv");
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expect(initialValue(el)).toBe("dv");
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});
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it("listen() attaches and cleanup removes listeners", () => {
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const el = document.createElement("button");
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let count = 0;
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const handler = () => { count++; };
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const cleanup = listen(el, [["click", handler]]);
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el.click();
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expect(count).toBe(1);
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cleanup();
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el.click();
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expect(count).toBe(1);
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});
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it("listen() returns noop for null element", () => {
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const cleanup = listen(null, [["click", () => {}]]);
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expect(typeof cleanup).toBe("function");
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cleanup();
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});
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it("wireLabel() connects label htmlFor to control id", () => {
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const control = document.createElement("input");
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const label = document.createElement("label");
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wireLabel(control, label, "test");
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expect(control.id).toMatch(/^test-/);
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expect(label.htmlFor).toBe(control.id);
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});
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it("wireLabel() does nothing with null label", () => {
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const control = document.createElement("input");
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wireLabel(control, null, "test");
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expect(control.id).toBe("");
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});
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});
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