react-native-easy-calendar/lib/module/Utils/getExtraDays.test.js

Customizable, easy-to-use, performant calendar components for React Native

import dayjs from 'dayjs';
import getExtraDays from './getExtraDays';
test('Negative range - "to" is before "from"', () => {
  const result = getExtraDays({
    from: dayjs('2020-01-02'),
    to: dayjs('2020-01-01')
  });
  expect(result).toEqual([]);
});
describe('Positive range - "to" is equal to/after "from"', () => {
  test('1 day', () => {
    const result = getExtraDays({
      from: dayjs('2020-01-01'),
      to: dayjs('2020-01-01')
    });
    expect(result.length).toBe(1);
    expect(result[0].isSame('2020-01-01', 'day')).toBeTruthy();
  });
  test('2 days', () => {
    const result = getExtraDays({
      from: dayjs('2020-01-01'),
      to: dayjs('2020-01-02')
    });
    expect(result.length).toBe(2);
    expect(result[0].isSame('2020-01-01', 'day')).toBeTruthy();
    expect(result[1].isSame('2020-01-02', 'day')).toBeTruthy();
  });
  test('5 days', () => {
    const result = getExtraDays({
      from: dayjs('2020-01-01'),
      to: dayjs('2020-01-05')
    });
    expect(result.length).toBe(5);
    expect(result[0].isSame('2020-01-01', 'day')).toBeTruthy();
    expect(result[1].isSame('2020-01-02', 'day')).toBeTruthy();
    expect(result[2].isSame('2020-01-03', 'day')).toBeTruthy();
    expect(result[3].isSame('2020-01-04', 'day')).toBeTruthy();
    expect(result[4].isSame('2020-01-05', 'day')).toBeTruthy();
  });
});
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