jsPsych/packages/jspsych/tests/utils/utils.test.ts

import jsPsych from "../../src";

describe("unique", function () {
  test("generates unique array when there are duplicates", function () {
    var arr = [1, 1, 2, 2, 3, 3];
    var out = jsPsych.utils.unique(arr);
    expect(out).toEqual([1, 2, 3]);
    expect(out).not.toEqual(arr);
  });

  test("generates same array when there are no duplicates", function () {
    var arr = [1, 2, 3];
    var out = jsPsych.utils.unique(arr);
    expect(out).toEqual(arr);
  });
});

describe("flatten", function () {
  test("generates flat array from flat input", function () {
    var arr = [1, 1, 2, 2, 3, 3];
    var out = jsPsych.utils.flatten(arr);
    expect(out).toEqual(arr);
  });

  test("generates flat array from nested input", function () {
    var arr = [1, [1, 2, 2], [3], 3];
    var out = jsPsych.utils.flatten(arr);
    expect(out).toEqual([1, 1, 2, 2, 3, 3]);
  });
});

describe("deepCopy", function () {
  test("works for objects", function () {
    var o = { a: 1, b: { c: 2, d: 3 } };
    var o2 = jsPsych.utils.deepCopy(o);
    o2.b.c = 4;
    expect(o.b.c).toBe(2);
  });
  test("works for objects with arrays", function () {
    var o = { a: 1, b: [2, 3] };
    var o2 = jsPsych.utils.deepCopy(o);
    o2.b[0] = 4;
    expect(JSON.stringify(o2.b)).toBe(JSON.stringify([4, 3]));
    expect(o.b[0]).toBe(2);
  });
  test("works for objects with functions", function () {
    var c = 0;
    var o = {
      a: 1,
      b: function () {
        c = 2;
      },
    };
    var o2 = jsPsych.utils.deepCopy(o);
    o2.b = function () {
      c = 1;
    };
    o.b();
    expect(c).toBe(2);
    o2.b();
    expect(c).toBe(1);
  });
});