mirror of https://github.com/garrytan/gstack.git
191 lines
7.8 KiB
TypeScript
191 lines
7.8 KiB
TypeScript
/**
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* Unit tests for the image width policy + conservative auto-landscape
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* (image-policy.ts). Pure HTML-in/HTML-out — no browse daemon.
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*
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* The promotion heuristic is deliberately conservative (eng-review P4):
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* false negatives are cheap (add {page=landscape}), false positives feel
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* broken. The negative cases here are the load-bearing ones.
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*/
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import { describe, expect, test } from "bun:test";
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import {
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applyImageDirectives,
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applyImagePolicy,
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parseDirectives,
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} from "../src/image-policy";
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const silent = { warn: () => {} };
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// 6.5in content box → threshold = 6.5 × 96 × 2.5 = 1560 CSS px.
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const OPTS = { contentWidthIn: 6.5, ...silent };
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function img(attrs: string): string {
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return `<p><img ${attrs}></p>`;
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}
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// ─── directive parsing ────────────────────────────────────────────────
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describe("parseDirectives", () => {
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test("width grammar", () => {
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expect(parseDirectives("width=full")).toEqual({ width: "full", page: undefined });
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expect(parseDirectives("width=50%")).toEqual({ width: "50%", page: undefined });
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expect(parseDirectives("width=3in")).toEqual({ width: "3in", page: undefined });
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expect(parseDirectives("width=2.5cm")).toEqual({ width: "2.5cm", page: undefined });
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});
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test("page grammar + combination", () => {
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expect(parseDirectives("page=landscape")).toEqual({ width: undefined, page: "landscape" });
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expect(parseDirectives("width=full page=portrait")).toEqual({ width: "full", page: "portrait" });
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});
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test("unknown tokens reject the whole group (stays visible text)", () => {
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expect(parseDirectives("widht=full")).toBeNull();
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expect(parseDirectives("width=full caption=x")).toBeNull();
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});
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test("malformed values reject", () => {
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expect(parseDirectives("width=banana")).toBeNull();
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expect(parseDirectives("page=sideways")).toBeNull();
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});
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});
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describe("applyImageDirectives", () => {
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test("brace suffix becomes data attrs and is consumed", () => {
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const out = applyImageDirectives(`<p><img src="x.png" alt="a">{width=50%}</p>`);
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expect(out).toContain('data-gstack-width="50%"');
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expect(out).not.toContain("{width=50%}");
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});
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test("unrecognized brace group is left as literal text", () => {
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const html = `<p><img src="x.png">{not a directive}</p>`;
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expect(applyImageDirectives(html)).toBe(html);
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});
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test("non-adjacent braces untouched", () => {
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const html = `<p>set {width=full} in config</p>`;
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expect(applyImageDirectives(html)).toBe(html);
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});
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});
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// ─── width policy ─────────────────────────────────────────────────────
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describe("width styles", () => {
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test("width=full → inline 100% style", () => {
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const { html } = applyImagePolicy(img(`src="x" data-gstack-width="full"`), OPTS);
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expect(html).toContain("width: 100%");
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});
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test("explicit dimension passes through", () => {
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const { html } = applyImagePolicy(img(`src="x" data-gstack-width="3in"`), OPTS);
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expect(html).toContain("width: 3in");
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});
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test("no directive → no inline style (CSS max-width owns the default)", () => {
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const { html } = applyImagePolicy(img(`src="x" data-gstack-px-width="40" data-gstack-px-height="20"`), OPTS);
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expect(html).not.toContain("style=");
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});
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});
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// ─── landscape promotion ──────────────────────────────────────────────
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describe("auto-landscape: negative cases (the load-bearing ones)", () => {
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test("wide screenshot with no alt hint stays portrait", () => {
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const r = applyImagePolicy(
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img(`src="x" alt="screenshot of the app" data-gstack-px-width="3000" data-gstack-px-height="900"`),
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OPTS,
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);
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expect(r.hasLandscape).toBe(false);
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expect(r.html).not.toContain("page-wide");
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});
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test("wide banner with hint but below width threshold stays portrait", () => {
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const r = applyImagePolicy(
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img(`src="x" alt="chart" data-gstack-px-width="1200" data-gstack-px-height="400"`),
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OPTS,
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);
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expect(r.hasLandscape).toBe(false);
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});
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test("tall diagram (aspect below 1.8) stays portrait", () => {
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const r = applyImagePolicy(
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img(`src="x" alt="architecture diagram" data-gstack-px-width="2000" data-gstack-px-height="1500"`),
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OPTS,
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);
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expect(r.hasLandscape).toBe(false);
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});
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test("no intrinsic dimensions stays portrait", () => {
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const r = applyImagePolicy(img(`src="x" alt="diagram"`), OPTS);
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expect(r.hasLandscape).toBe(false);
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});
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test("page=portrait vetoes everything", () => {
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const r = applyImagePolicy(
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img(`src="x" alt="diagram" data-gstack-page="portrait" data-gstack-px-width="4000" data-gstack-px-height="1000"`),
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OPTS,
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);
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expect(r.hasLandscape).toBe(false);
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});
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test("threshold boundary is deterministic: exactly at threshold stays portrait", () => {
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// threshold = 6.5 × 96 × 2.5 = 1560
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const r = applyImagePolicy(
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img(`src="x" alt="diagram" data-gstack-px-width="1560" data-gstack-px-height="600"`),
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OPTS,
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);
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expect(r.hasLandscape).toBe(false);
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const r2 = applyImagePolicy(
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img(`src="x" alt="diagram" data-gstack-px-width="1561" data-gstack-px-height="600"`),
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OPTS,
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);
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expect(r2.hasLandscape).toBe(true);
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});
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});
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describe("auto-landscape: positive cases", () => {
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test("wide + alt hint + over threshold promotes and wraps", () => {
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const warnings: string[] = [];
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const r = applyImagePolicy(
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img(`src="x" alt="architecture diagram" data-gstack-px-width="2400" data-gstack-px-height="1000"`),
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{ contentWidthIn: 6.5, warn: (m) => warnings.push(m) },
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);
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expect(r.hasLandscape).toBe(true);
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expect(r.html).toContain('<div class="page-wide"><img');
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expect(r.html).not.toContain("<p><img");
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expect(warnings[0]).toContain("landscape");
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});
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test("page=landscape forces promotion regardless of size", () => {
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const r = applyImagePolicy(img(`src="x" data-gstack-page="landscape"`), OPTS);
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expect(r.hasLandscape).toBe(true);
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});
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test("alt hint matches whole words only", () => {
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const r = applyImagePolicy(
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img(`src="x" alt="photographic" data-gstack-px-width="2400" data-gstack-px-height="1000"`),
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OPTS,
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);
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expect(r.hasLandscape).toBe(false); // "graph" inside "photographic" must not match
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});
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});
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describe("auto-landscape: diagram figures", () => {
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const fig = (svgAttrs: string, figAttrs = "") =>
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`<figure class="diagram" role="img" aria-label="d"${figAttrs}>\n<svg ${svgAttrs}><g/></svg>\n</figure>`;
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test("wide diagram via viewBox promotes (provenance automatic, no alt needed)", () => {
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const r = applyImagePolicy(fig(`width="100%" viewBox="0 0 2050 600"`), OPTS);
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expect(r.hasLandscape).toBe(true);
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expect(r.html).toContain('<div class="page-wide"><figure');
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});
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test("normal flowchart stays portrait", () => {
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const r = applyImagePolicy(fig(`width="100%" viewBox="0 0 800 400"`), OPTS);
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expect(r.hasLandscape).toBe(false);
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});
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test("fence page=portrait vetoes a wide diagram", () => {
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const r = applyImagePolicy(
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fig(`width="100%" viewBox="0 0 3000 600"`, ` data-gstack-page="portrait"`),
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OPTS,
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);
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expect(r.hasLandscape).toBe(false);
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});
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test("fence page=landscape forces a small diagram", () => {
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const r = applyImagePolicy(
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fig(`width="100%" viewBox="0 0 400 300"`, ` data-gstack-page="landscape"`),
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OPTS,
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);
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expect(r.hasLandscape).toBe(true);
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});
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test("diagnostic blocks are never promoted", () => {
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const html = `<figure class="diagram diagram-error" role="img" aria-label="x"><svg viewBox="0 0 4000 600"></svg></figure>`;
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const r = applyImagePolicy(html, OPTS);
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expect(r.hasLandscape).toBe(false);
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});
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});
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