diff --git a/spec/integration/parser/collector_spec.rb b/spec/integration/parser/collector_spec.rb
index ec9d0929c..f4fa4f0ee 100755
--- a/spec/integration/parser/collector_spec.rb
+++ b/spec/integration/parser/collector_spec.rb
@@ -1,180 +1,200 @@
 #! /usr/bin/env ruby
 require 'spec_helper'
 require 'puppet_spec/compiler'
 
 require 'puppet/parser/collector'
 
 describe Puppet::Parser::Collector do
   include PuppetSpec::Compiler
 
   def expect_the_message_to_be(expected_messages, code, node = Puppet::Node.new('the node'))
     catalog = compile_to_catalog(code, node)
     messages = catalog.resources.find_all { |resource| resource.type == 'Notify' }.
                                  collect { |notify| notify[:message] }
     messages.should include(*expected_messages)
   end
 
   shared_examples_for "virtual resource collection" do
     it "matches everything when no query given" do
       expect_the_message_to_be(["the other message", "the message"], <<-MANIFEST)
         @notify { "testing": message => "the message" }
         @notify { "other": message => "the other message" }
 
         Notify <| |>
       MANIFEST
     end
 
     it "matches on tags" do
       expect_the_message_to_be(["wanted"], <<-MANIFEST)
         @notify { "testing": tag => ["one"], message => "wanted" }
         @notify { "other": tag => ["two"], message => "unwanted" }
 
         Notify <| tag == one |>
       MANIFEST
     end
 
     it "matches on title" do
       expect_the_message_to_be(["the message"], <<-MANIFEST)
         @notify { "testing": message => "the message" }
 
         Notify <| title == "testing" |>
       MANIFEST
     end
 
     it "matches on other parameters" do
       expect_the_message_to_be(["the message"], <<-MANIFEST)
         @notify { "testing": message => "the message" }
         @notify { "other testing": message => "the wrong message" }
 
         Notify <| message == "the message" |>
       MANIFEST
     end
 
     it "matches against elements of an array valued parameter" do
       expect_the_message_to_be([["the", "message"]], <<-MANIFEST)
         @notify { "testing": message => ["the", "message"] }
         @notify { "other testing": message => ["not", "here"] }
 
         Notify <| message == "message" |>
       MANIFEST
     end
 
     it "allows criteria to be combined with 'and'" do
       expect_the_message_to_be(["the message"], <<-MANIFEST)
         @notify { "testing": message => "the message" }
         @notify { "other": message => "the message" }
 
         Notify <| title == "testing" and message == "the message" |>
       MANIFEST
     end
 
     it "allows criteria to be combined with 'or'" do
       expect_the_message_to_be(["the message", "other message"], <<-MANIFEST)
         @notify { "testing": message => "the message" }
         @notify { "other": message => "other message" }
         @notify { "yet another": message => "different message" }
 
         Notify <| title == "testing" or message == "other message" |>
       MANIFEST
     end
 
     it "allows criteria to be combined with 'or'" do
       expect_the_message_to_be(["the message", "other message"], <<-MANIFEST)
         @notify { "testing": message => "the message" }
         @notify { "other": message => "other message" }
         @notify { "yet another": message => "different message" }
 
         Notify <| title == "testing" or message == "other message" |>
       MANIFEST
     end
 
     it "allows criteria to be grouped with parens" do
       expect_the_message_to_be(["the message", "different message"], <<-MANIFEST)
         @notify { "testing":     message => "different message", withpath => true }
         @notify { "other":       message => "the message" }
         @notify { "yet another": message => "the message",       withpath => true }
 
         Notify <| (title == "testing" or message == "the message") and withpath == true |>
       MANIFEST
     end
 
     it "does not do anything if nothing matches" do
       expect_the_message_to_be([], <<-MANIFEST)
         @notify { "testing": message => "different message" }
 
         Notify <| title == "does not exist" |>
       MANIFEST
     end
 
     it "excludes items with inequalities" do
       expect_the_message_to_be(["good message"], <<-MANIFEST)
         @notify { "testing": message => "good message" }
         @notify { "the wrong one": message => "bad message" }
 
         Notify <| title != "the wrong one" |>
       MANIFEST
     end
 
     it "does not exclude resources with unequal arrays" do
       expect_the_message_to_be(["message", ["not this message", "or this one"]], <<-MANIFEST)
         @notify { "testing": message => "message" }
         @notify { "the wrong one": message => ["not this message", "or this one"] }
 
         Notify <| message != "not this message" |>
       MANIFEST
     end
 
     it "does not exclude tags with inequalities" do
       expect_the_message_to_be(["wanted message", "the way it works"], <<-MANIFEST)
         @notify { "testing": tag => ["wanted"], message => "wanted message" }
         @notify { "other": tag => ["why"], message => "the way it works" }
 
         Notify <| tag != "why" |>
       MANIFEST
     end
 
-    context "issue #10963" do
-      it "collects with override when inside a class" do
+    context "overrides" do
+      it "modifies an existing array" do
+        expect_the_message_to_be([["original message", "extra message"]], <<-MANIFEST)
+          @notify { "testing": message => ["original message"] }
+
+          Notify <| |> {
+            message +> "extra message"
+          }
+        MANIFEST
+      end
+
+      it "converts a scalar to an array" do
+        expect_the_message_to_be([["original message", "extra message"]], <<-MANIFEST)
+          @notify { "testing": message => "original message" }
+
+          Notify <| |> {
+            message +> "extra message"
+          }
+        MANIFEST
+      end
+
+      it "collects with override when inside a class (#10963)" do
         expect_the_message_to_be(["overridden message"], <<-MANIFEST)
           @notify { "testing": message => "original message" }
 
           include collector_test
           class collector_test {
             Notify <| |> {
               message => "overridden message"
             }
           }
         MANIFEST
       end
 
-      it "collects with override when inside a define" do
+      it "collects with override when inside a define (#10963)" do
         expect_the_message_to_be(["overridden message"], <<-MANIFEST)
           @notify { "testing": message => "original message" }
 
           collector_test { testing: }
           define collector_test() {
             Notify <| |> {
               message => "overridden message"
             }
           }
         MANIFEST
       end
     end
   end
 
   describe "in the current parser" do
     before :each do
       Puppet[:parser] = 'current'
     end
 
     it_behaves_like "virtual resource collection"
   end
 
   describe "in the future parser" do
     before :each do
       Puppet[:parser] = 'future'
     end
 
     it_behaves_like "virtual resource collection"
   end
 end