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Classes in Ruby are first-class objects—each is an instance of class Class. -- ruby-doc.org

class Person
  ...
end

Person = Class.new do
  ...
end

Class.new(super_class=Object) creates a new anonymous (unnamed) class with the given superclass (or Object if no parameter is given). You can give a class a name by assigning the class object to a constant. -- ruby-doc.org

klass = Class.new
klass.ancestors # => [#<Class:0x21b38>, Object, Kernel]
klass.new.class # => #<Class:0x21b38>

Person = klass
Person.ancestors # => [Person, Object, Kernel]
Person.new.class # => Person

klass.ancestors # => [Person, Object, Kernel]
klass.new.class # => Person
klass # => Person

require 'test/unit'

module Gateway
  def post(arg)
    # implementation...
    true
  end
end

class GatewayTest < Test::Unit::TestCase
  def test_post_returns_true
    klass = Class.new do
      include Gateway
    end
    assert_equal true, klass.new.post(1)
  end
end