def collection_tests(collection, params = {}, mocks_implemented = true)

  tests('success') do

    tests("#new(#{params.inspect})").succeeds do
      pending if Fog.mocking? && !mocks_implemented
      collection.new(params)
    end

    tests("#create(#{params.inspect})").succeeds do
      pending if Fog.mocking? && !mocks_implemented
      @instance = collection.create(params)
    end

    # FIXME: work around for timing issue on AWS describe_instances mocks
    if Fog.mocking? && @instance.respond_to?(:ready?)
      @instance.wait_for { ready? }
    end

    tests("#all").succeeds do
      pending if Fog.mocking? && !mocks_implemented
      collection.all
    end
    
    

    if !Fog.mocking? || mocks_implemented
      @identity = @instance.identity
    end

    tests("#get(#{@identity})").succeeds do
      pending if Fog.mocking? && !mocks_implemented
      collection.get(@identity)
    end

    tests('Enumerable') do
      pending if Fog.mocking? && !mocks_implemented

      [
        'all?', 'any?', 'find',  'detect', 'collect', 'map', 
        'find_index', 'flat_map', 'collect_concat', 'group_by',
        'none?', 'one?'
      ].each do |enum_method|
        if collection.respond_to?(enum_method)
          tests("##{enum_method}").succeeds do
            block_called = false
            collection.send(enum_method) {|x| block_called = true }
            block_called
          end
        end
      end

      [
        'max_by','min_by'
      ].each do |enum_method|
        if collection.respond_to?(enum_method)
          tests("##{enum_method}").succeeds do
            block_called = false
            collection.send(enum_method) {|x| block_called = true; 0 }
            block_called
          end
        end

      end

    end


    if block_given?
      yield
    end

    if !Fog.mocking? || mocks_implemented
      @instance.destroy
    end
  end
  
  tests('failure') do

    if !Fog.mocking? || mocks_implemented
      @identity = @identity.to_s
      @identity = @identity.gsub(/[a-zA-Z]/) { Fog::Mock.random_letters(1) }
      @identity = @identity.gsub(/\d/)       { Fog::Mock.random_numbers(1) }
      @identity
    end

    tests("#get('#{@identity}')").returns(nil) do
      pending if Fog.mocking? && !mocks_implemented
      collection.get(@identity)
    end

  end

end