added RSpec and RSpec on Rails

vendor/gems/rspec-1.1.2/examples/pure/shared_stack_examples.rb

@@ -0,0 +1,38 @@
+require File.join(File.dirname(__FILE__), *%w[spec_helper])
+
+shared_examples_for "non-empty Stack" do
+
+  it { @stack.should_not be_empty }
+  
+  it "should return the top item when sent #peek" do
+    @stack.peek.should == @last_item_added
+  end
+
+  it "should NOT remove the top item when sent #peek" do
+    @stack.peek.should == @last_item_added
+    @stack.peek.should == @last_item_added
+  end
+  
+  it "should return the top item when sent #pop" do
+    @stack.pop.should == @last_item_added
+  end
+  
+  it "should remove the top item when sent #pop" do
+    @stack.pop.should == @last_item_added
+    unless @stack.empty?
+      @stack.pop.should_not == @last_item_added
+    end
+  end
+  
+end
+
+shared_examples_for "non-full Stack" do
+
+  it { @stack.should_not be_full }
+
+  it "should add to the top when sent #push" do
+    @stack.push "newly added top item"
+    @stack.peek.should == "newly added top item"
+  end
+
+end