text: import { totalBirdCount, birdsInWeek, fixBirdCountLog } from './bird-watcher';
  
  describe('bird watcher', () => {
    describe('totalBirdCount', () => {
      test('calculates the correct total number of birds', () => {
        const birdsPerDay = [9, 0, 8, 4, 5, 1, 3];
        expect(totalBirdCount(birdsPerDay)).toBe(30);
      });
  
      test('works for a short bird count list', () => {
        const birdsPerDay = [2];
        expect(totalBirdCount(birdsPerDay)).toBe(2);
      });
  
      test('works for a long bird count list', () => {
        // prettier-ignore
        const birdsPerDay = [2, 8, 4, 1, 3, 5, 0, 4, 1, 6, 0, 3, 0, 1, 5, 4, 1, 1, 2, 6];
        expect(totalBirdCount(birdsPerDay)).toBe(57);
      });
    });
  
    describe('birdsInWeek', () => {
      test('calculates the number of birds in the first week', () => {
        const birdsPerDay = [3, 0, 5, 1, 0, 4, 1, 0, 3, 4, 3, 0, 8, 0];
        expect(birdsInWeek(birdsPerDay, 1)).toBe(14);
      });
  
      test('calculates the number of birds for a week in the middle of the log', () => {
        // prettier-ignore
        const birdsPerDay = [4, 7, 3, 2, 1, 1, 2, 0, 2, 3, 2, 7, 1, 3, 0, 6, 5, 3, 7, 2, 3];
        expect(birdsInWeek(birdsPerDay, 2)).toBe(18);
      });
  
      test('works when there is only one week', () => {
        const birdsPerDay = [3, 0, 3, 3, 2, 1, 0];
        expect(birdsInWeek(birdsPerDay, 1)).toBe(12);
      });
  
      test('works for a long bird count list', () => {
        const week21 = [2, 0, 1, 4, 1, 3, 0];
        const birdsPerDay = randomArray(20 * 7)
          .concat(week21)
          .concat(randomArray(10 * 7));
  
        expect(birdsInWeek(birdsPerDay, 21)).toBe(11);
      });
    });
  
    describe('fixBirdCountLog', () => {
      test('returns a bird count list with the corrected values', () => {
        const birdsPerDay = [3, 0, 5, 1, 0, 4, 1, 0, 3, 4, 3, 0];
        const expected = [4, 0, 6, 1, 1, 4, 2, 0, 4, 4, 4, 0];
        expect(fixBirdCountLog(birdsPerDay)).toEqual(expected);
      });
  
      test('does not create a new array', () => {
        const birdsPerDay = [2, 0, 1, 4, 1, 3, 0];
  
        // this follows the suggestion from the Jest docs to avoid a confusing test report
        // https://jestjs.io/docs/expect#tobevalue
        expect(Object.is(fixBirdCountLog(birdsPerDay), birdsPerDay)).toBe(true);
      });
  
      test('works for a short bird count list', () => {
        expect(fixBirdCountLog([4, 2])).toEqual([5, 2]);
      });
  
      test('works for a long bird count list', () => {
        // prettier-ignore
        const birdsPerDay = [2, 8, 4, 1, 3, 5, 0, 4, 1, 6, 0, 3, 0, 1, 5, 4, 1, 1, 2, 6];
        // prettier-ignore
        const expected = [3, 8, 5, 1, 4, 5, 1, 4, 2, 6, 1, 3, 1, 1, 6, 4, 2, 1, 3, 6];
        expect(fixBirdCountLog(birdsPerDay)).toEqual(expected);
      });
    });
  });
  
  function randomArray(length) {
    return Array.from({ length: length }, () => Math.floor(Math.random() * 8));
  }
  