tests: move test/helpers to test/test_helpers.

The Rails convention is for test/helpers to be used for testing the view
helpers in app/helpers. We were using it to store certain utility
methods instead. Move these to test/test_helpers so that test/helpers
can be used for its intended purpose.

test/test_helpers/saved_search_test_helper.rb

@@ -0,0 +1,23 @@
+module SavedSearchTestHelper
+  def mock_saved_search_service!
+    mock_sqs_service = Class.new do
+      def initialize
+        @commands = []
+      end
+
+      def commands
+        @commands
+      end
+
+      def send_message(msg)
+        @commands << msg.split(/\n/).first
+      end
+    end
+
+    service = mock_sqs_service.new
+    SavedSearch.stubs(:sqs_service).returns(service)
+    Danbooru.config.stubs(:aws_sqs_saved_search_url).returns("http://localhost:3002")
+    Danbooru.config.stubs(:listbooru_auth_key).returns("blahblahblah")
+    Danbooru.config.stubs(:listbooru_server).returns("http://localhost:3001")
+  end
+end