--- /dev/null
+require File.dirname(__FILE__) + '/spec_helper'
+
+def behave_as_electric_musician
+ respond_to(:read_notes, :turn_down_amp)
+end
+
+def behave_as_musician
+ respond_to(:read_notes)
+end
+
+module BehaveAsExample
+
+ class BluesGuitarist
+ def read_notes; end
+ def turn_down_amp; end
+ end
+
+ class RockGuitarist
+ def read_notes; end
+ def turn_down_amp; end
+ end
+
+ class ClassicGuitarist
+ def read_notes; end
+ end
+
+ describe BluesGuitarist do
+ it "should behave as guitarist" do
+ BluesGuitarist.new.should behave_as_electric_musician
+ end
+ end
+
+ describe RockGuitarist do
+ it "should behave as guitarist" do
+ RockGuitarist.new.should behave_as_electric_musician
+ end
+ end
+
+ describe ClassicGuitarist do
+ it "should not behave as guitarist" do
+ ClassicGuitarist.new.should behave_as_musician
+ end
+ end
+
+end