import { describe, expect, it } from "vitest";
import { snapFromStart, snappedDelta } from "../src/ui/phy/dragMath";

describe("PHY drag math", () => {
  it("snaps from the operation start in quarter-unit increments", () => {
    expect(snapFromStart(0.1, 0.28)).toBeCloseTo(0.25);
    expect(snapFromStart(0.1, 0.38)).toBeCloseTo(0.5);
  });
  it("returns snapped local deltas", () => {
    expect(snappedDelta({ x: 1, y: 1 }, { x: 1.37, y: 0.61 })).toEqual({ x: 0.25, y: -0.5 });
  });
});