gistfile1.rb

class MyClass
  def self.all_methods
    all_singleton_methods + all_instance_methods
  end
  
  def self.all_singleton_methods
    singleton_methods
  end
  
  def self.all_instance_methods
    instance_methods
  end
end

describe MyClass
  describe '.all_methods' do
    before do
      MyClass.stubs(all_singleton_methods: [:a], all_instance_methods: [:b])
    end
    
    it 'returns all singleton and instance methods' do
      MyClass.all_methods.should eq([:a, :b])
    end
  end
end