Duck Type Checker is a simple module that makes it easier for you to check the method signature of an object.

Checking an object is as simple as;

require 'ducktypechecker'

o = 1
# This will cause a TypeError to be raised
DuckType.check(o, :blah)

# You can also customize your responses to missing methods
DuckType.check(o, [:blah, :bling]) do |s|
raise "Method #{s.to_s} needs to be implemented,"
end

# To install use 'gem install ducktypechecker'