add kgm-uppgift21a.rb
added solution steps
finished kgm-uppgift21a.rb
add uppgift21b & test files
set up test case for uppgift21b
let the tests drive development, undefined method 'fill_boxes'
let the tests drive development, wrong number of arguments (2 for 0)
failing test: test_fill_boxes, <166> expected but was <nil>
no failing tests :)
add uppgift21c file, test cases
test suite doesn't recognise Boxmachine, fix this first
test suite complains of missing initialize function
no test suite compalaints, time to write another (failing) test
test suite compains of missing getter for storage
no test suite compalaints, time to write another (failing) test
added passing test for box_size getter
refactored test suite to use setup function for boxmachine
broken test for one filled box, need to implement fill method
filling one box works
filling no boxes with insufficient amount in storage works