import { shift } from 'tools/array';

describe('tools/array', () => {
  describe('[function] shift', () => {
    const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
    test('should shift array right 3 positions', () => {
      const result = shift(arr, 3);
      expect(result).toEqual([7, 8, 9, 1, 2, 3, 4, 5, 6]);
    });
    test('should shift array left 3 positions', () => {
      const result = shift(arr, -3);
      expect(result).toEqual([4, 5, 6, 7, 8, 9, 1, 2, 3]);
    });
    test('should shift array right 6 positions', () => {
      const result = shift(arr, 15);
      expect(result).toEqual([4, 5, 6, 7, 8, 9, 1, 2, 3]);
    });
    test('should shift array left 6 positions', () => {
      const result = shift(arr, -15);
      expect(result).toEqual([7, 8, 9, 1, 2, 3, 4, 5, 6]);
    });
    test('should keep array as is', () => {
      const result = shift(arr, 0);
      expect(result).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9]);
    });
    test('should keep array as is', () => {
      const result = shift(arr, 9);
      expect(result).toEqual([1, 2, 3, 4, 5, 6, 7, 8, 9]);
    });
    test('should return empty array', () => {
      const result = shift([], 0);
      expect(result).toEqual([]);
    });
    test('should return empty array', () => {
      const result = shift([], 0);
      expect(result).toEqual([]);
    });
  });
});