super_spec.rb

class Account
  def initialize
    @members = []
  end

  def add_member(m)
    @members << m
  end

  def has_member?(m)
    @members.include? m
  end
end

describe Account, "has_member?" do
  before(:each) do
    @account = Account.new
  end

  it "should be false if it does not have the member" do
    @account.should_not be_has_member(:foo)
  end

  it "should be true if it does have the member" do
    @account.add_member :foo
    @account.should have_member(:foo)
  end
end