34 lines
1.1 KiB
TypeScript
34 lines
1.1 KiB
TypeScript
import { content } from "@deadhead/content";
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import { describe, expect, it } from "vitest";
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import { routeDistance } from "../src/index";
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const earth = content.location("earth")!;
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const moon = content.location("moon")!;
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const mars = content.location("mars")!;
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const start = Date.parse("2100-01-01T00:00:00Z");
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const MS_PER_DAY = 86_400_000;
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/** Game times sampled every ~30 days across two years. */
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const monthly = Array.from({ length: 25 }, (_, i) => start + i * 30 * MS_PER_DAY);
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describe("route distance", () => {
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it("keeps Earth→Moon under 1 million km at any time", () => {
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for (const t of monthly) {
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expect(routeDistance(earth, moon, t)).toBeLessThan(1);
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}
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});
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it("gives the same distance at every time (decision 0.5.93)", () => {
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const first = routeDistance(earth, mars, monthly[0]!);
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for (const t of monthly) expect(routeDistance(earth, mars, t)).toBe(first);
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});
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it("is symmetric", () => {
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for (const a of content.locations) {
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for (const b of content.locations) {
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expect(routeDistance(a, b, start)).toBe(routeDistance(b, a, start));
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}
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}
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});
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});
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