rspec 针对元编程的测试

待测试类

 1 class MyClassDynamic
 2   DEFAULT_METHOD_NAME = :my_dynamic_method
 3
 4   def initialize(method_name = nil)
 5     method_name = DEFAULT_METHOD_NAME unless method_name
 6
 7     method_definition = Proc.new { method_name.to_s }
 8     self.class.send(:define_method, method_name, method_definition)
 9   end
10 end

rspec

 1 require ‘spec_helper‘
 2
 3 shared_examples "a dynamic my class" do |method_name = nil|
 4   let(:address) { method_name.nil? ? MyClassDynamic.new : MyClassDynamic.new(method_name) }
 5
 6   it "creates the method" do
 7     address.should respond_to method_name
 8   end
 9
10   it "returns the method name as a string" do
11     address.send(method_name).should eq(method_name.to_s)
12   end
13 end
14
15 describe MyClassDynamic do
16   it_behaves_like "a dynamic my class", MyClassDynamic::DEFAULT_METHOD_NAME
17   it_behaves_like "a dynamic my class", :my_dynamic_method
18   it_behaves_like "a dynamic my class", :your_dynamic_method
19 end