empty test pass
single number test pass
contain many numbers test pass
contain string test pass
contain many strings test pass
contain strings and numbers test pass
contain true test pass
refactoring
contain false test pass
refactor
refactor
contain null test pass
contain empty string test pass
contain double test pass
contain mixed types test pass
contain emty array test pass
contain array with one element test pass
contain array with many element test pass
refactor
refactor contain mixed types