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require 'rubygems' require 'spec' module SpyMatchers class MethodRecorder def method_missing(sym, *args) MethodVerifier.new({sym => args}) end end def have_received MethodRecorder.new end class MethodVerifier def initialize(expected) @expected = expected end def matches?(target) @target = target @target.was_method_called?(@expected) end def failure_message "expected #{@target.__subject__.inspect} to have received #{@expected.keys[0]}(#{@expected.values[0]})" end def negative_failure_message "expected #{@target.__subject__.inspect} not to have received #{@expected.keys[0]}(#{@expected.values[0]})" end end end class Spy def self.on(subject) Spy.new(subject) end def initialize(subject) @subject = subject @method_calls = [] end def was_method_called?(method_with_args) return @method_calls.include?(method_with_args) end def __subject__ @subject end def method_missing(sym, *args) @method_calls << {sym => args} @subject.send(sym, *args) end end describe "ubiquitous assertion syntax" do include SpyMatchers it "should test state" do 2.should == 1+1 end it "should test an error" do lambda { [].not_a_method }.should raise_error(NoMethodError) end it "should test behavior" do array = Spy.on [] [1, 2].each do |number| array << number end array.should have_received << 1 array.should have_received << 2 end end

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