add test

* string family
    * fixstr
    * str 8
    * str 16
    * str 32
* float family
* array family
    * fixarray
    * array 16
    * array 32
* integer family
    * positive-fixnum
    * negative-fixnum
    * int16 except negative case
    * int32 except negative case
Merge branch 'enhancement/test'