coming up to speed with RSpec

coming_up_to_spec.rb

specify "knowledge of nil" do
	''.should_not be_nil
end

specify "numeric calculations" do
	(355.0 / 113).should be_close(Math::PI, 0.1)
end

specify "changes made by a closure" do
	array = []
	lambda {
		array << :a
	}.should change(array, :size)
end

specify "equality" do
	5.should eql 5
	5.should equal 5
	[:a].should_not equal [:a]
end

specify "raising of errors" do
	#	always construct fresh!!!
	#		otherwise it won't be re-wrappable
	def raiser(s=nil)
		lambda { raise(RuntimeError, s) if s }
	end

	raiser('x').should raise_error
	raiser('y').should raise_error(RuntimeError, 'y')
end

specify "closure satisfaction" do
	5.should satisfy {|n| (4..6).include?(n) }
end

specify "what lists do" do
	[].should respond_to(:each, :find, :size)
end