may need a bit more practice and help

lor

@@ -0,0 +1,24 @@
+.FF
+
+Failures:
+
+  1) MessageBoard should receive slow down from conductor
+     Failure/Error: conductor.see_danger_coming!
+     NameError:
+       undefined local variable or method `conductor' for #<RSpec::Core::ExampleGroup::Nested_2:0x00000101262710>
+     # ./train_spec.rb:22:in `block (2 levels) in <top (required)>'
+
+  2) MessageBoard should receive a slow down confirmation from the engineer
+     Failure/Error: message_board.should_receive(:confirm_slow_down!)
+       (#<MessageBoard:0x0000010086a690>).confirm_slow_down!(any args)
+           expected: 1 time with any arguments
+           received: 0 times with any arguments
+     # ./train_spec.rb:26:in `block (2 levels) in <top (required)>'
+
+Finished in 0.01176 seconds
+3 examples, 2 failures
+
+Failed examples:
+
+rspec ./train_spec.rb:20 # MessageBoard should receive slow down from conductor
+rspec ./train_spec.rb:25 # MessageBoard should receive a slow down confirmation from the engineer

train.rb

@@ -12,4 +12,22 @@ def see_danger_coming!
 end
 
 class Engineer
+
+  def slow_down!
+  end
+end
+
+class MessageBoard
+
+  attr_reader :message_board
+
+  def initialize(message_board)
+    @message_board = message_board
+  end
+
+  def confirm
+    @message_board.slow_down!
+  end
+
+
 end

train_spec.rb

@@ -1,5 +1,6 @@
 require 'rspec'
 require './train'
+
 describe Conductor do
 
 	let(:engineer) { Engineer.new }
@@ -10,4 +11,34 @@
 		conductor.see_danger_coming!
 	end
 
-end
+end
+
+describe MessageBoard do
+
+  let(:message_board) { MessageBoard.new(engineer) }
+  let(:conductor) { Conductor.new(engineer)}
+  let(:engineer) { Engineer.new }
+
+  it "should receive slow down from conductor" do
+    message_board.should_receive(:slow_down!)
+    conductor.see_danger_coming!
+  end
+
+  it "should receive a slow down confirmation from the engineer" do
+    message_board.confirm.should_receive(:slow_down!)
+    engineer.should_receive(:slow_down!)
+  end
+end
+
+# Your Assignment
+# ---------------
+
+# In most circumstances like this, there's a sort of MessageBoard. Let's create
+# the idea of a MessageBoard class that both the engineer and the conductor know
+# about.
+
+# 1. When the conductor sees trouble, the conductor tells the `message_board` to slow down
+# 2. When the engineer slows down, the engineer tells the `message_board` `confirm_slow_down`
+
+# Use whichever mocking tool you liked the best or are interested in. If you
+# don't know what to choose, go with RSpec.