1: Green

/Users/casiano/local/src/ruby/LPP/rspec_examples/rpcalculator/
|~lib/                         
| |~math/                      
| | `-rpcalc.rb                
| `-rpcalc.rb                  
|~spec/                        
| |~math/                      
| | `-rpcalc_spec.rb
| `-spec_helper.rb  
|-Rakefile      
`-README.md

[~/local/src/ruby/LPP/rspec_examples/rpcalculator(0)]$ cat Rakefile 
desc 'run rspec tests'
task :spec do
  sh "rspec -Ilib -Ispec spec/math/rpcalc_spec.rb"
end
...

[~/local/src/ruby/LPP/rspec_examples/rpcalculator(master)]$ cat spec/math/rpcalc_spec.rb 
#require File.join(File.dirname(__FILE__), "/../spec_helper")
require "spec_helper"
module Math
  describe RPCalc do

  end
end

[~/local/src/ruby/LPP/rspec_examples/rpcalculator(master)]$ cat spec/spec_helper.rb 
#$: << File.join(File.dirname(__FILE__), "../../lib")
require "rspec"
require "rpcalc"

[~/local/src/ruby/LPP/rspec_examples/rpcalculator(master)]$ cat lib/math/rpcalc.rb 
module Math
  class RPCalc
  end  # class RPCalc
end    # Math

[~/local/src/ruby/LPP/rspec_examples/rpcalculator(master)]$ cat lib/rpcalc.rb 
require 'math/rpcalc'

[~/local/src/ruby/LPP/rspec_examples/rpcalculator(1)]$ rake spec
rspec -Ilib -Ispec spec/math/rpcalc_spec.rb
No examples found.

Finished in 0.00005 seconds
0 examples, 0 failures