在没有Shoulda的Rspec中如何进行单行测试？

class MyObject
  attr_accessor :first, :last, :phone

  def initialize first = nil, last = nil, phone = nil
    self.first = first
    self.last = last
    self.phone = phone
  end
end

RSpec::Matchers.define :have_value do |attribute, expected|
  match do |obj|
    obj.send(attribute) == expected
  end 

  description do
    \"have value #{expected} for attribute #{attribute}\" 
  end
end

describe MyObject do
  h = {:first => \'wes\', :last => \'bailey\', :phone => \'111.111.1111\'}

  subject { MyObject.new h[:first], h[:last], h[:phone] }

  h.each do |k,v|
    it { should have_value k, v}
  end
end

> rspec -cfn matcher.rb 

MyObject
  should have value wes for attribute first
  should have value bailey for attribute last
  should have value 111.111.1111 for attribute phone

Finished in 0.00143 seconds
3 examples, 0 failures

shoulda

it { should do_something }

it { subject.attribute.should do_something }

subject

specify

it

specify { subject.attribute.should do_something }

specify { @o.attribute.should eql(val) }

subject { @o }
it { attribute.should == value }