In Place Testing for Ruby methods
This is something kinda experimental I'm working on. Testing is cool, but I hate that it's separate from my code. Perhaps that's stupidity on my part, but I wanted to see if there's a way to bring the lowest level of testing directly into the class..
1 2 module InPlaceTesting 3 def self.included(klass) 4 old_method_added = klass.method(:method_added) 5 new_method_added = lambda do |m| 6 @@current_method = m 7 old_method_added.call m 8 end 9 10 # Next line inspired by http://utils.ning.com/ruby/dbc.rb by Brian McCallister and Martin Traverso 11 (class << klass; self; end).send :define_method, :method_added, new_method_added 12 13 class << klass 14 def given(*args) 15 self.new.send @@current_method, *args 16 end 17 def method_should(message, params) 18 unless params[:return] == params[:when] 19 puts "\"#{@@current_method}\" fails to #{message} (returns #{params[:when]} instead of #{params[:return]})" 20 end 21 end 22 end 23 24 end 25 26 end 27 28 class DumbClass 29 include InPlaceTesting 30 31 def add(x,y) 32 x + y 33 end 34 method_should "add 5 and 4", :return => 9, :when => given(5, 4) 35 36 def subtract(x,y) 37 x - y 38 end 39 method_should "subtract 5 from 14", :return => 9, :when => given(14,5) 40 41 def increment(x) 42 x + 1 43 end 44 method_should "increment 12", :return => 13, :when => given(12) 45 end
