Lucas WintherandClaude Opus 5
d491437e32
Events routinely end within a day of each other, and at the old close end of the ladder their bar ends were a few pixels apart — the board being asked the one question it exists to answer and telling the reader to squint. Seventy-two and 108 px/day separate them, and give a one-day event a bar wide enough to read and to tap rather than the 34px every short bar collapses to. The clamp test now reads the ladder's last rung instead of naming 48, so extending it again does not need the test rewritten. Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
94 lines
3.4 KiB
TypeScript
94 lines
3.4 KiB
TypeScript
import { describe, expect, test } from "bun:test";
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import {
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canStep,
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DAY_WIDTHS,
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DEFAULT_DAY_WIDTH,
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snapDayWidth,
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stepDayWidth,
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weekLabelStep,
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} from "../src/client/state/zoom.ts";
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/**
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* The timeline's scale.
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*
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* A patch cycle is six weeks and a login campaign can run for months, so the
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* reader picks how much time is on screen. What these pin down is the two ways
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* that can go wrong: a stored value the ladder no longer contains, and an axis
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* whose dates stop being readable once they are close enough together.
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*/
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describe("snapDayWidth", () => {
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test("a value on the ladder is left alone", () => {
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for (const width of DAY_WIDTHS) expect(snapDayWidth(width)).toBe(width);
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});
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test("a value between steps lands on the nearest one", () => {
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// An export written against a different ladder still opens on something
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// close to what its reader chose.
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expect(snapDayWidth(10)).toBe(9);
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expect(snapDayWidth(7)).toBe(6);
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expect(snapDayWidth(1000)).toBe(DAY_WIDTHS[DAY_WIDTHS.length - 1]!);
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// Exactly between two steps takes the wider one: ties go to the more
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// legible board.
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expect(snapDayWidth(11)).toBe(13);
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});
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test("an unusable value is the default, not the nearest edge", () => {
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// A corrupt number is not a preference, and a board one pixel wide is not
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// a scale anyone chose.
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expect(snapDayWidth(0)).toBe(DEFAULT_DAY_WIDTH);
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expect(snapDayWidth(-5)).toBe(DEFAULT_DAY_WIDTH);
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expect(snapDayWidth(Number.NaN)).toBe(DEFAULT_DAY_WIDTH);
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expect(snapDayWidth(Number.POSITIVE_INFINITY)).toBe(DEFAULT_DAY_WIDTH);
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});
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});
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describe("stepDayWidth", () => {
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test("moves one step at a time", () => {
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expect(stepDayWidth(13, 1)).toBe(20);
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expect(stepDayWidth(13, -1)).toBe(9);
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});
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test("stops at the ends rather than wrapping", () => {
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const widest = DAY_WIDTHS[DAY_WIDTHS.length - 1]!;
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const narrowest = DAY_WIDTHS[0]!;
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expect(stepDayWidth(widest, 1)).toBe(widest);
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expect(stepDayWidth(narrowest, -1)).toBe(narrowest);
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});
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test("the close end goes past a week on screen", () => {
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// Several events routinely end within a day of each other, and the reader
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// has to be able to tell those ends apart — at 48px a day they are a few
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// pixels between.
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expect(canStep(48, 1)).toBe(true);
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expect(stepDayWidth(48, 1)).toBe(72);
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const widest = DAY_WIDTHS[DAY_WIDTHS.length - 1]!;
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// A single day wider than a fingertip, so a one-day event is readable and
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// tappable rather than the 34px minimum bar.
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expect(widest).toBeGreaterThanOrEqual(96);
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});
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test("canStep says when a control has nowhere left to go", () => {
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expect(canStep(DAY_WIDTHS[0]!, -1)).toBe(false);
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expect(canStep(DAY_WIDTHS[0]!, 1)).toBe(true);
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expect(canStep(DAY_WIDTHS[DAY_WIDTHS.length - 1]!, 1)).toBe(false);
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});
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});
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describe("weekLabelStep", () => {
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test("every Monday is dated at the default scale and closer in", () => {
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expect(weekLabelStep(DEFAULT_DAY_WIDTH)).toBe(1);
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expect(weekLabelStep(48)).toBe(1);
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});
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test("dates thin out rather than overlapping when zoomed out", () => {
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// At six px a day a week is 42px and "18 Aug" is wider than that.
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expect(weekLabelStep(6)).toBeGreaterThan(1);
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expect(weekLabelStep(6) * 7 * 6).toBeGreaterThanOrEqual(64);
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});
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test("never asks for a label every zero weeks", () => {
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expect(weekLabelStep(1000)).toBe(1);
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});
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});
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