Arnaud
66 lines
2.0 KiB
TypeScript
66 lines
2.0 KiB
TypeScript
import { describe, it, expect } from "vitest";
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import { formatQuantity, scaleQuantity } from "../fractions";
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describe("formatQuantity", () => {
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it("returns '0' for 0", () => {
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expect(formatQuantity(0)).toBe("0");
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});
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it("returns whole numbers as strings", () => {
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expect(formatQuantity(1)).toBe("1");
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expect(formatQuantity(4)).toBe("4");
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});
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it("rounds near-integer values up", () => {
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expect(formatQuantity(0.97)).toBe("1");
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expect(formatQuantity(2.96)).toBe("3");
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});
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it("formats known fractions with unicode symbols", () => {
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expect(formatQuantity(0.5)).toBe("½");
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expect(formatQuantity(0.25)).toBe("¼");
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expect(formatQuantity(0.75)).toBe("¾");
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expect(formatQuantity(0.333)).toBe("⅓");
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expect(formatQuantity(0.667)).toBe("⅔");
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expect(formatQuantity(0.125)).toBe("⅛");
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});
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it("formats mixed numbers", () => {
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expect(formatQuantity(1.5)).toBe("1 ½");
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expect(formatQuantity(2.25)).toBe("2 ¼");
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expect(formatQuantity(3.75)).toBe("3 ¾");
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});
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it("falls back to one decimal for values that don't match a fraction", () => {
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// 0.4375 is midpoint between ⅜ (0.375) and ½ (0.5), diff=0.0625 from both — exceeds 0.06 threshold
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expect(formatQuantity(0.4375)).toMatch(/^0\.\d$/);
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});
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});
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describe("scaleQuantity", () => {
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it("returns empty string for null/empty base quantity", () => {
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expect(scaleQuantity(null, 4, 2)).toBe("");
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expect(scaleQuantity("", 4, 2)).toBe("");
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});
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it("returns base quantity unchanged for non-numeric strings", () => {
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expect(scaleQuantity("to taste", 4, 2)).toBe("to taste");
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});
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it("scales down by half", () => {
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expect(scaleQuantity("4", 4, 2)).toBe("2");
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});
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it("scales up by double", () => {
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expect(scaleQuantity("2", 2, 4)).toBe("4");
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});
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it("handles base=0 gracefully (no division by zero)", () => {
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expect(scaleQuantity("3", 0, 4)).toBe("3");
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});
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it("produces fraction symbols when result is fractional", () => {
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expect(scaleQuantity("1", 2, 1)).toBe("½");
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});
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});
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