58 wiersze
1.6 KiB
TypeScript
58 wiersze
1.6 KiB
TypeScript
import { normalizedPoint2rad, normalizePoint } from "./point";
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describe("normalizePoint()", () => {
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it("Does nothing to points w/ length 1", () => {
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expect(normalizePoint({ x: 1, y: 0 })).toEqual({ x: 1, y: 0 });
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expect(normalizePoint({ x: 0, y: 1 })).toEqual({ x: 0, y: 1 });
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});
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it("Raises an exception on points w/ length 0", () => {
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expect(() => normalizePoint({ x: 0, y: 0 })).toThrow(
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"Unable to normalize point with length 0"
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);
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});
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it("Normalizes points", () => {
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expect(normalizePoint({ x: 1, y: 1 })).toEqual({
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x: 1 / Math.sqrt(2),
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y: 1 / Math.sqrt(2),
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});
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});
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});
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describe("normalizedPoint2rad()", () => {
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it("works for (1, 0)", () => {
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expect(normalizedPoint2rad({ x: 1, y: 0 })).toBe(0);
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});
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it("works for (0, 1)", () => {
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expect(normalizedPoint2rad({ x: 0, y: 1 })).toBe(Math.PI / 2);
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});
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it("works for (-1, 0)", () => {
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expect(normalizedPoint2rad({ x: -1, y: 0 })).toBe(Math.PI);
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});
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it("works for (-0.9999, 0.0499)", () => {
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expect(
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normalizedPoint2rad({ x: -0.9999875634527172, y: 0.0049872778043753814 })
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).toBeCloseTo(Math.PI);
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});
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it("works for (-0.9999, -0.0499)", () => {
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expect(
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normalizedPoint2rad({ x: -0.9999875634527172, y: -0.0049872778043753814 })
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).toBeCloseTo(Math.PI);
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});
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it("works for (0.9999, -0.0499)", () => {
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expect(
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normalizedPoint2rad({ x: 0.9999875634527172, y: -0.0049872778043753814 })
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).toBeCloseTo(2 * Math.PI);
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});
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it("works for (0, -1)", () => {
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expect(normalizedPoint2rad({ x: 0, y: -1 })).toBe(Math.PI + Math.PI / 2);
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});
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});
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