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 */ import { isEqual } from 'lodash' ; see https function stringify ( x ) { return JSON . stringify ( x , function ( _key , value ) { if ( Array . isArray ( value ) ) { return ( '[' + value . map ( function ( i ) { return '\n\t' + stringify ( i ) ; } ) + '\n]' ) ; } return value ; } ) . replace ( /\\"/g , '"' ) . replace ( /\\t/g , '\t' ) . replace ( /\\n/g , '\n' ) ; } see https function deleteErrorNotificationStack ( marble ) { const { notification } = marble ; if ( notification ) { const { kind , error } = notification ; if ( kind === 'E' && error instanceof Error ) { notification . error = { name : error . name , message : error . message } ; } } return marble ; } see https export function observableMatcher ( actual , expected ) { if ( Array . isArray ( actual ) && Array . isArray ( expected ) ) { actual = actual . map ( deleteErrorNotificationStack ) ; expected = expected . map ( deleteErrorNotificationStack ) ; const passed = isEqual ( actual , expected ) ; if ( passed ) { expect ( passed ) . toBe ( true ) ; return ; } let message = '\nExpected \n' ; actual . forEach ( ( x ) => ( message += `\t${ stringify ( x ) }\n` ) ) ; message += '\t\nto deep equal \n' ; expected . forEach ( ( x ) => ( message += `\t${ stringify ( x ) }\n` ) ) ; fail ( message ) ; } else { expect ( actual ) . toEqual ( expected ) ; } }