dhis2/d2

import { generateFinancialAprilPeriodsUpToYear } from '../financial-april'

describe('Financial April period', () => {
    describe('generateFinancialAprilPeriodsUpToYear()', () => {
        it('should not allow years before the year zero', () => {
            expect(() =>
                generateFinancialAprilPeriodsUpToYear(-10)
            ).toThrowError()
        })

        it('should throw an error when passing a Date object', () => {
            expect(() =>
                generateFinancialAprilPeriodsUpToYear(new Date())
            ).toThrowError()
        })

        it('should generate 10 yearly periods when no numberOfYears was passed', () => {
            expect(generateFinancialAprilPeriodsUpToYear(2017)).toHaveLength(10)
        })

        it('should generate periods for 10 years with the last one being the current year', () => {
            const tenYearlyPeriods = generateFinancialAprilPeriodsUpToYear(2017)

            expect(tenYearlyPeriods).toEqual([
                {
                    endDate: '2009-03-31',
                    startDate: '2008-04-01',
                    name: 'April 2008 - March 2009',
                    id: '2008April',
                },
                {
                    endDate: '2010-03-31',
                    startDate: '2009-04-01',
                    name: 'April 2009 - March 2010',
                    id: '2009April',
                },
                {
                    endDate: '2011-03-31',
                    startDate: '2010-04-01',
                    name: 'April 2010 - March 2011',
                    id: '2010April',
                },
                {
                    endDate: '2012-03-31',
                    startDate: '2011-04-01',
                    name: 'April 2011 - March 2012',
                    id: '2011April',
                },
                {
                    endDate: '2013-03-31',
                    startDate: '2012-04-01',
                    name: 'April 2012 - March 2013',
                    id: '2012April',
                },
                {
                    endDate: '2014-03-31',
                    startDate: '2013-04-01',
                    name: 'April 2013 - March 2014',
                    id: '2013April',
                },
                {
                    endDate: '2015-03-31',
                    startDate: '2014-04-01',
                    name: 'April 2014 - March 2015',
                    id: '2014April',
                },
                {
                    endDate: '2016-03-31',
                    startDate: '2015-04-01',
                    name: 'April 2015 - March 2016',
                    id: '2015April',
                },
                {
                    endDate: '2017-03-31',
                    startDate: '2016-04-01',
                    name: 'April 2016 - March 2017',
                    id: '2016April',
                },
                {
                    endDate: '2018-03-31',
                    startDate: '2017-04-01',
                    name: 'April 2017 - March 2018',
                    id: '2017April',
                },
            ])
        })

        it('should respect the number of years parameter and generate the correct number of years', () => {
            const fiveYearlyPeriods = generateFinancialAprilPeriodsUpToYear(
                2017,
                5
            )

            expect(fiveYearlyPeriods).toEqual([
                {
                    endDate: '2014-03-31',
                    startDate: '2013-04-01',
                    name: 'April 2013 - March 2014',
                    id: '2013April',
                },
                {
                    endDate: '2015-03-31',
                    startDate: '2014-04-01',
                    name: 'April 2014 - March 2015',
                    id: '2014April',
                },
                {
                    endDate: '2016-03-31',
                    startDate: '2015-04-01',
                    name: 'April 2015 - March 2016',
                    id: '2015April',
                },
                {
                    endDate: '2017-03-31',
                    startDate: '2016-04-01',
                    name: 'April 2016 - March 2017',
                    id: '2016April',
                },
                {
                    endDate: '2018-03-31',
                    startDate: '2017-04-01',
                    name: 'April 2017 - March 2018',
                    id: '2017April',
                },
            ])
        })

        it('should throw an error when the numberOfYears is not a positive integer', () => {
            expect(() =>
                generateFinancialAprilPeriodsUpToYear(2017, 'a')
            ).toThrowError()
            expect(() =>
                generateFinancialAprilPeriodsUpToYear(2017, 1.2)
            ).toThrowError()
            expect(() =>
                generateFinancialAprilPeriodsUpToYear(2017, true)
            ).toThrowError()
            expect(() =>
                generateFinancialAprilPeriodsUpToYear(2017, -1)
            ).toThrowError()
            expect(() =>
                generateFinancialAprilPeriodsUpToYear(2017, 0)
            ).toThrowError()
            expect(() =>
                generateFinancialAprilPeriodsUpToYear(2017, Infinity)
            ).toThrowError()
        })

        it('should generate the yearly periods for 2021 and 2022', () => {
            const fiveYearlyPeriods = generateFinancialAprilPeriodsUpToYear(
                2022,
                2
            )

            expect(fiveYearlyPeriods).toEqual([
                {
                    endDate: '2022-03-31',
                    startDate: '2021-04-01',
                    name: 'April 2021 - March 2022',
                    id: '2021April',
                },
                {
                    endDate: '2023-03-31',
                    startDate: '2022-04-01',
                    name: 'April 2022 - March 2023',
                    id: '2022April',
                },
            ])
        })

        it('should generate use the current year when no year has been given', () => {
            expect(generateFinancialAprilPeriodsUpToYear()).toEqual(
                generateFinancialAprilPeriodsUpToYear(new Date().getFullYear())
            )
        })
    })
})