import { mergeFilters } from './merge-filters' ; describe ( 'merge filters' , ( ) => { it ( 'defaults to A when B is null' , ( ) => { const A = { } ; const B = null ; expect ( mergeFilters ( A , B ) ) . toEqual ( A ) ; } ) ; it ( 'defaults to B when A is null' , ( ) => { const A = null ; const B = { } ; expect ( mergeFilters ( A , B ) ) . toEqual ( B ) ; } ) ; it ( 'merges with an _and by default' , ( ) => { const A = { a : { _eq : 1 } } ; const B = { b : { _eq : 2 } } ; expect ( mergeFilters ( A , B ) ) . toStrictEqual ( { _and : [ A , B ] } ) ; } ) ; it ( 'allows merging on _or with a parameter' , ( ) => { const A = { a : { _eq : 1 } } ; const B = { b : { _eq : 2 } } ; expect ( mergeFilters ( A , B , 'or' ) ) . toStrictEqual ( { _or : [ A , B ] } ) ; } ) ; } ) ;