extlib-assert_kind_of-does-not-like-class-reloading.rb

require 'rubygems'
require 'spec'
require 'extlib'

module SomeNamespace; end

describe 'Extlib#assert_kind_of' do
  include Extlib::Assertions

  it 'should handle constant reloading' do
    class SomeNamespace::SomeClass; end 
    @instance = SomeNamespace::SomeClass.new

    lambda { assert_kind_of 'test', @instance, SomeNamespace::SomeClass }.should_not raise_error

    # reload SomeNamespace::SomeClass constant
    lambda { SomeNamespace::SomeClass }.should_not raise_error
    SomeNamespace.send(:remove_const, :SomeClass)
    lambda { SomeNamespace::SomeClass }.should raise_error(NameError, 'uninitialized constant SomeNamespace::SomeClass')
    class SomeNamespace::SomeClass; end 

    lambda { assert_kind_of 'test', @instance, SomeNamespace::SomeClass }.should_not raise_error
  end 

end

failure.txt

Extlib#assert_kind_of
- should handle constant reloading (FAILED - 1)

1)
'Extlib#assert_kind_of should handle constant reloading' FAILED
expected no Exception, got #<ArgumentError: +test+ should be SomeClass, but was SomeClass>
./extlib-assert_kind_of-does-not-like-class-reloading.rb:18:

monkeypatch-that-adds-class-name-checking.rb

module Extlib
  module Assertions

    # Allows for classes to be reloaded.
    # In theory, we might only want to allow this while in development mode.
    #
    # As run the original assert_kind_of and, if an ArgumentError is raised, 
    # we double-check that none of the class names match.
    #
    # If they match, we return, assuming that, if the class names match, 
    # then the actual type is a match.
    #
    # If there are no class name matches, we raise the original exception.
    def assert_kind_of_with_allow_class_name_matching(name, value, *klasses)
      begin
        assert_kind_of_without_allow_class_name_matching(name, value, *klasses)
      rescue ArgumentError
        klasses.each { |k| return if value.class.name == k.name }
        raise # if we haven't returned, raise the original exception
      end
    end

    alias_method_chain :assert_kind_of, :allow_class_name_matching

  end 
end