diff --git a/spec/unit/rubella/storage/add_spec.rb b/spec/unit/rubella/storage/add_spec.rb
index 2bb4e10..f16645c 100644
--- a/spec/unit/rubella/storage/add_spec.rb
+++ b/spec/unit/rubella/storage/add_spec.rb
@@ -10,4 +10,20 @@ describe Rubella::Storage, '.add' do
     expect(storage_new.data).to eq([0, 1, 2, 3, 4, 5])
   end
 
+  it "uses the length of the first given Storage" do
+    storage_1 = Rubella::Storage.new [3, 4, 5, 6, 7], 4
+    storage_2 = Rubella::Storage.new [0, 1, 2], 3
+
+    storage_new = storage_1.add storage_2
+    expect(storage_new.length).to eq 4
+  end
+
+  it "chops the data to the given length" do
+    storage_1 = Rubella::Storage.new [3, 4, 5, 6, 7], 4
+    storage_2 = Rubella::Storage.new [0, 1, 2], 3
+
+    storage_new = storage_1.add storage_2
+    expect(storage_new.data).to eq([0, 1, 2, 3])
+  end
+
 end
diff --git a/spec/unit/rubella/storage/length_spec.rb b/spec/unit/rubella/storage/length_spec.rb
new file mode 100644
index 0000000..579a54a
--- /dev/null
+++ b/spec/unit/rubella/storage/length_spec.rb
@@ -0,0 +1,11 @@
+require 'spec_helper'
+
+describe Rubella::Storage, '.length' do
+
+  it "returns the current length" do
+    storage = Rubella::Storage.new [3, 4, 5]
+
+    expect(storage.length).to eq 3
+  end
+
+end
\ No newline at end of file