import createInMemoryStorage from "./InMemoryStorage" ; it ( "should set and unset values" , ( ) => { const storage = createInMemoryStorage ( ) ; storage . setItem ( "test" , "value" ) ; expect ( storage . getItem ( "test" ) ) . toBe ( "value" ) ; storage . removeItem ( "test" ) ; expect ( storage . getItem ( "test" ) ) . toBeNull ( ) ; } ) ; it ( "should return length" , ( ) => { const storage = createInMemoryStorage ( ) ; storage . setItem ( "a" , "value" ) ; storage . setItem ( "b" , "value" ) ; storage . setItem ( "c" , "value" ) ; expect ( storage . length ) . toBe ( 3 ) ; } ) ; it ( "should nth key" , ( ) => { const storage = createInMemoryStorage ( ) ; storage . setItem ( "a" , "0" ) ; storage . setItem ( "b" , "1" ) ; storage . setItem ( "c" , "2" ) ; expect ( storage . key ( 2 ) ) . toBe ( "c" ) ; } ) ; it ( "accepts predefined data" , ( ) => { const storage = createInMemoryStorage ( { a : "0" , b : "1" , c : "2" , } ) ; expect ( storage . toString ( ) ) . toMatchSnapshot ( ) ; } ) ;