Allow colection enumerator to be enumerated multiple times

Options should be cleared on subsequent calls within the loop because they
are already included in the next_page url.
However each time the enumerator is enumerated it calls the initial get and
needs the options passed in.

lib/ansible_tower_client/collection.rb

@@ -16,10 +16,11 @@ def find_all_by_url(url, get_options = nil)
       Enumerator.new do |yielder|
         @collection = []
         next_page   = url
+        options     = get_options
 
         loop do
-          next_page = fetch_more_results(next_page, get_options) if @collection.empty?
-          get_options = nil
+          next_page = fetch_more_results(next_page, options) if @collection.empty?
+          options = nil
           raise StopIteration if @collection.empty?
           yielder.yield(@collection.shift)
         end

spec/collection_spec.rb

@@ -0,0 +1,23 @@
+describe AnsibleTowerClient::Collection do
+  let(:connection)  { double("connection") }
+  let(:mock_api)    { AnsibleTowerClient::Api.new(connection) }
+  let(:instance)    { described_class.new(mock_api) }
+  let(:test_url)    { "/api/v1/things/1/related_things/" }
+  let(:get_options) { {"key" => "value"} }
+  let(:response_1)  { double("response", :body => body_1) }
+  let(:body_1)      { {"next_page" => nil, "results" => (1..5).collect { |i| {:id => i, :type => "host"} }}.to_json }
+
+  context "#find_all_by_url" do
+    it "is an Enumerator" do
+      expect(instance.find_all_by_url(test_url)).to be_kind_of(Enumerator)
+    end
+
+    it "ensures all get_options are applied to all requests" do
+      expect(mock_api).to receive(:get).with(anything, get_options).twice.and_return(response_1)
+
+      collection = instance.find_all_by_url(test_url, get_options)
+      expect(collection.count).to eq(5)
+      expect(collection.count).to eq(5)
+    end
+  end
+end