These tests check, that 

    $H({fruit:"apple", vegetable:"cucumber"}).reject(function(el) { return (el[1] == 'cucumber'); }) 
    yields
    $H({fruit:"apple"}) 

    and 

    $H({fruit:"apple", vegetable:"cucumber"}).findAll(function(el) { return (el[1] == 'apple'); }) 
    yields
    $H({fruit:"apple"})