From 808e8972b5e6ca70cedcf3e723eaff4688370ec5 Mon Sep 17 00:00:00 2001
From: Stormwind <stormwind@stormwinds-page.de>
Date: Sat, 14 Mar 2015 10:29:15 +0100
Subject: [PATCH] Concatunate storages into new storage

Now we cat add new data to the old storage, which returns a new storage
containg first the new data and then the old data.
Plus a test for this, because it's not implemented now.
---
 lib/rubella/storage.rb                | 10 ++++++++++
 spec/spec_helper.rb                   |  9 +++++++++
 spec/unit/rubella/storage/add_spec.rb | 13 +++++++++++++
 3 files changed, 32 insertions(+)
 create mode 100644 spec/spec_helper.rb
 create mode 100644 spec/unit/rubella/storage/add_spec.rb

diff --git a/lib/rubella/storage.rb b/lib/rubella/storage.rb
index 2c924ba..6c79d7f 100644
--- a/lib/rubella/storage.rb
+++ b/lib/rubella/storage.rb
@@ -25,6 +25,16 @@ module Rubella
       # TODO drop entries, if more than new length
     end
 
+    # Adds the data from the given storage to the own data and return this as a
+    # new Storage. Does not modify one of the storages. 
+    # 
+    # @param storage Rubella::Storage Storage with new data
+    # @return Rubella::Storage
+    #
+    def add storage
+      Storage.new (storage.data+@data), @length
+    end
+
   end
 
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..8783013
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,9 @@
+if ENV['SIMPLECOV']
+  require 'simplecov'
+  SimpleCov.start do
+    add_filter '_spec.rb'
+    add_filter 'spec_helper.rb'
+  end
+end
+
+require 'rubella'
diff --git a/spec/unit/rubella/storage/add_spec.rb b/spec/unit/rubella/storage/add_spec.rb
new file mode 100644
index 0000000..2bb4e10
--- /dev/null
+++ b/spec/unit/rubella/storage/add_spec.rb
@@ -0,0 +1,13 @@
+require 'spec_helper'
+
+describe Rubella::Storage, '.add' do
+  
+  it "returns a new Storage with the given Storages data before the old" do
+    storage_1 = Rubella::Storage.new [3, 4, 5]
+    storage_2 = Rubella::Storage.new [0, 1, 2]
+
+    storage_new = storage_1.add storage_2
+    expect(storage_new.data).to eq([0, 1, 2, 3, 4, 5])
+  end
+
+end