example.rb

require 'rspec/autorun'

class Person
  attr_accessor :first_name, :last_name, :gender

  def full_name
    "#{first_name} #{last_name}"
  end

  def self.average_age
    23
  end

  private

  def age
    20
  end

end

class Rockstar < Person; end

def visible?(klass, meth)
  klass.respond_to?(meth) || klass.method_defined?(meth)
end
private :visible?

describe "visible?" do
  context "Person" do
    it "it should be true for accessor methods" do
      visible?(Person, :first_name).should be_true
      visible?(Person, :first_name=).should be_true
    end

    it "it should be true for instance method" do
      visible?(Person, :full_name).should be_true
    end

    it "should be true for class method" do
      visible?(Person, :average_age).should be_true
    end

    it "should be false for private method" do
      visible?(Person, :age).should be_false
    end
  end

  context "Rockstar" do
    it "it should be true for accessor methods" do
      visible?(Rockstar, :first_name).should be_true
      visible?(Rockstar, :first_name=).should be_true
    end

    it "it should be true for instance method" do
      visible?(Rockstar, :full_name).should be_true
    end

    it "should be true for class method" do
      visible?(Rockstar, :average_age).should be_true
    end

    it "should be false for private method" do
      visible?(Rockstar, :age).should be_false
    end
  end
end