test => summed size equal to array length
test => sum ordered array
test => sum with empty array
test => sum size is 0
refactoring => extract sum method
test => sum size large than array size
test => sum in reversed order
test => sum negative numbers
refactoring => extract sort method
refactoring => using best practice from codewars
Merge branch 'excercise_in_summing'
add test into all-tests.html
Merge branch 'origin/master' into master