Just a simple recursion test

ruby_recursive.rb

#faking the rails class to keep the test simple
class Rails
  def self.env
    "development"
  end
end

def get_descriptor(descriptor, descriptor_keys = Rails.env, i = 0)
  if descriptor.is_a?(Array) || descriptor.is_a?(String)
    descriptor
  elsif descriptor.is_a?(Hash)
    if descriptor_keys.is_a?(Array)
      get_descriptor(descriptor[descriptor_keys[i]], descriptor_keys, i + 1)
    else
      descriptor[descriptor_keys]
    end
  end
end

describe "descriptor" do

  it "should return self when subject is a string" do
    subject = "subject"
    get_descriptor(subject).should == subject
  end

  it "should return self when subject is an array" do
    subject = %w(subject1 subject2 subject3)
    get_descriptor(subject).should == subject
  end

  it "should return the hash member of development" do
    subject = {"development" => "subject"}
    get_descriptor(subject).should == "subject"
  end

  it "should return nil when no member matches a descriptor key" do
    subject = {"gibberish" => "subject"}
    get_descriptor(subject).should be_nil
  end


  context "with multiple descriptor keys" do
    before :each do
      @keys = %w(development test)
    end
    it "should return something" do
      subject = { "development" => "subject1", "test" => "subject2"}
      get_descriptor(subject,@keys).should == "subject1" #why? 
      # I would have guessed the intent would have been to return something
      # like ["subject1","subject2"]. 
      # What is the desired purpose of the function? 
      # What is a sample input of a hash and keys and expected return value look like.
    end

    it "should probably still return something" do
      subject = { "test" => "subject2"}
      get_descriptor(subject,@keys).should == "subject2" #maybe?
      #as it is anything but the first key will ever be returned.
    end

  end

end