:sparkles: fix how to use function definition

  - function name() {}    should be private in a module
    - called  : YES
    - assigned: NO
  - name = function() {}
    - called  : YES
    - assigned: YES
:sparkles: rename assertion
:sparkles: fix to refine test functions
:sparkles: fix to refine test code style
:boom: fix typo
:muscle: fix typo checker to be able to easily add rules like eslint
Merge pull request #103 from mohayonao/dev

update dev tools