import assert from "node:assert";
import { describe, it } from "node:test";
import { getLinesProp } from "./index";

describe("getLinesProp", () => {
  it("should return the same number when source is a number", () => {
    assert.strictEqual(getLinesProp(100, 0), 100);
    assert.strictEqual(getLinesProp(100, 1), 100);
    assert.strictEqual(getLinesProp(100, 5), 100);
  });

  it("should return array element by index when source is an array", () => {
    const array = [ 100, 200, 300, 400 ];

    assert.strictEqual(getLinesProp(array, 0), 100);
    assert.strictEqual(getLinesProp(array, 1), 200);
    assert.strictEqual(getLinesProp(array, 2), 300);
    assert.strictEqual(getLinesProp(array, 3), 400);
  });

  it("should handle empty array (returns undefined)", () => {
    assert.strictEqual(getLinesProp([], 0), undefined);
    assert.strictEqual(getLinesProp([], 5), undefined);
  });

  it("should work with decimal numbers", () => {
    assert.strictEqual(getLinesProp(12.5, 0), 12.5);
    assert.strictEqual(getLinesProp([ 12.5, 15.75 ], 1), 15.75);
  });
});