import assert from 'assert' ; import formatRFC7231 from '.' ; describe ( 'formatRFC7231' , ( ) => { it ( 'formats RFC-7231 date string' , ( ) => { const date = new Date ( Date . UTC ( 2019 , 2 , 3 , 19 , 0 , 52 ) ) ; assert ( formatRFC7231 ( date ) === 'Sun, 03 Mar 2019 19:00:52 GMT' ) ; } ) ; it ( 'accepts a timestamp' , ( ) => { const date = Date . UTC ( 2019 , 9 , 4 , 12 , 30 , 13 ) ; assert ( formatRFC7231 ( date ) === 'Fri, 04 Oct 2019 12:30:13 GMT' ) ; } ) ; it ( 'throws RangeError if the time value is invalid' , ( ) => { assert . throws ( formatRFC7231 . bind ( null , new Date ( NaN ) ) , RangeError ) ; } ) ; it ( 'throws TypeError exception if passed less than 1 argument' , ( ) => { assert . throws ( formatRFC7231 . bind ( null ) , TypeError ) ; } ) ; } ) ;