Include Enumerable module into Flows

lib/rackstash/flows.rb

@@ -14,6 +14,8 @@ module Rackstash
   # used to write a single log event of a {Buffer} to multiple flows. Each
   # {Logger} object has an associated Flows object to define the logger's flows.
   class Flows
+    include ::Enumerable
+
     # @param flows [::Array<Flow, Adapter::Adapter, Object>] the {Flow} objects
     #   which should be part of the list. If any of the arguments is not a
     #   {Flow} already, we assume it is an adapter and create a new {Flow} for

spec/rackstash/flows_spec.rb

@@ -19,6 +19,14 @@ describe Rackstash::Flows do
     flow
   end
 
+  it 'is an Enumerable' do
+    expect(described_class).to be < Enumerable
+    expect(::Enumerable.public_instance_methods - flows.methods)
+      .to be_empty
+
+    expect(flows.map {}).to eql []
+  end
+
   describe '#initialize' do
     it 'accepts a single flow' do
       list = described_class.new(a_flow)