jumpSearch.test.js

import jumpSearch from '../jumpSearch';

describe('jumpSearch', () => {
  it('should search for an element in sorted array', () => {
    expect(jumpSearch([], 1)).toBe(-1);
    expect(jumpSearch([1], 2)).toBe(-1);
    expect(jumpSearch([1], 1)).toBe(0);
    expect(jumpSearch([1, 2], 1)).toBe(0);
    expect(jumpSearch([1, 2], 1)).toBe(0);
    expect(jumpSearch([1, 1, 1], 1)).toBe(0);
    expect(jumpSearch([1, 2, 5, 10, 20, 21, 24, 30, 48], 2)).toBe(1);
    expect(jumpSearch([1, 2, 5, 10, 20, 21, 24, 30, 48], 0)).toBe(-1);
    expect(jumpSearch([1, 2, 5, 10, 20, 21, 24, 30, 48], 0)).toBe(-1);
    expect(jumpSearch([1, 2, 5, 10, 20, 21, 24, 30, 48], 7)).toBe(-1);
    expect(jumpSearch([1, 2, 5, 10, 20, 21, 24, 30, 48], 5)).toBe(2);
    expect(jumpSearch([1, 2, 5, 10, 20, 21, 24, 30, 48], 20)).toBe(4);
    expect(jumpSearch([1, 2, 5, 10, 20, 21, 24, 30, 48], 30)).toBe(7);
    expect(jumpSearch([1, 2, 5, 10, 20, 21, 24, 30, 48], 48)).toBe(8);
  });

  it('should search object in sorted array', () => {
    const sortedArrayOfObjects = [
      { key: 1, value: 'value1' },
      { key: 2, value: 'value2' },
      { key: 3, value: 'value3' },
    ];

    const comparator = (a, b) => {
      if (a.key === b.key) return 0;
      return a.key < b.key ? -1 : 1;
    };

    expect(jumpSearch([], { key: 1 }, comparator)).toBe(-1);
    expect(jumpSearch(sortedArrayOfObjects, { key: 4 }, comparator)).toBe(-1);
    expect(jumpSearch(sortedArrayOfObjects, { key: 1 }, comparator)).toBe(0);
    expect(jumpSearch(sortedArrayOfObjects, { key: 2 }, comparator)).toBe(1);
    expect(jumpSearch(sortedArrayOfObjects, { key: 3 }, comparator)).toBe(2);
  });
});