import assert from 'assert' ; import setUTCDay from '.' ; describe ( 'setUTCDay' , ( ) => { it ( 'sets the day of the week' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 0 ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 7 , 31 ) ) ) ; } ) ; it ( 'allows to specify which day is the first day of the week' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 0 , { weekStartsOn : 1 , } ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 8 , 7 ) ) ) ; } ) ; it ( 'allows to specify which day is the first day of the week in locale' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 0 , { locale : { options : { weekStartsOn : 1 } , } , } ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 8 , 7 ) ) ) ; } ) ; it ( '`options.weekStartsOn` overwrites the first day of the week specified in locale' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 0 , { weekStartsOn : 1 , locale : { options : { weekStartsOn : 0 } , } , } ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 8 , 7 ) ) ) ; } ) ; describe ( 'the day index is more than 6' , ( ) => { it ( 'sets the day of the next week' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 8 ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 8 , 8 ) ) ) ; } ) ; it ( 'allows to specify which day is the first day of the week' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 7 , { weekStartsOn : 1 , } ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 8 , 14 ) ) ) ; } ) ; it ( 'sets the day of another week in the future' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 14 , { weekStartsOn : 1 , } ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 8 , 21 ) ) ) ; } ) ; } ) ; describe ( 'the day index is less than 0' , ( ) => { it ( 'sets the day of the last week' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , - 6 ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 7 , 25 ) ) ) ; } ) ; it ( 'allows to specify which day is the first day of the week' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , - 7 , { weekStartsOn : 1 , } ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 7 , 31 ) ) ) ; } ) ; it ( 'set the day of another week in the past' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , - 14 , { weekStartsOn : 1 , } ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 7 , 24 ) ) ) ; } ) ; } ) ; it ( 'accepts a timestamp' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) . getTime ( ) , 3 ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 8 , 3 ) ) ) ; } ) ; it ( 'converts a fractional number to an integer' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 0.9 ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 7 , 31 ) ) ) ; } ) ; it ( 'implicitly converts number arguments' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , '0' ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 7 , 31 ) ) ) ; } ) ; it ( 'implicitly converts options' , ( ) => { const result = setUTCDay ( new Date ( Date . UTC ( 2014 , 8 , 1 ) ) , 0 , { weekStartsOn : '1' , } ) ; assert . deepStrictEqual ( result , new Date ( Date . UTC ( 2014 , 8 , 7 ) ) ) ; } ) ; it ( 'does not mutate the original date' , ( ) => { const date = new Date ( Date . UTC ( 2014 , 8 , 1 ) ) ; setUTCDay ( date , 3 ) ; assert . deepStrictEqual ( date , new Date ( Date . UTC ( 2014 , 8 , 1 ) ) ) ; } ) ; it ( 'returns `Invalid Date` if the given date is invalid' , ( ) => { const result = setUTCDay ( new Date ( NaN ) , 0 ) ; assert ( result instanceof Date && isNaN ( result . getTime ( ) ) ) ; } ) ; it ( 'returns `Invalid Date` if the given amount is NaN' , ( ) => { const result = setUTCDay ( new Date ( 2014 , 8 , 1 ) , NaN ) ; assert ( result instanceof Date && isNaN ( result . getTime ( ) ) ) ; } ) ; it ( 'throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined' , ( ) => { const block = ( ) => setUTCDay ( new Date ( 2014 , 8 , 1 ) , 0 , { weekStartsOn : NaN , } ) ; assert . throws ( block , RangeError ) ; } ) ; it ( 'throws TypeError exception if passed less than 1 argument' , ( ) => { assert . throws ( setUTCDay . bind ( null , 1 ) , TypeError ) ; } ) ; } ) ;