Add tests for Rubella::Storage.length=

spec/unit/rubella/storage/length_eql_spec.rb

@@ -0,0 +1,68 @@
+require 'spec_helper'
+
+describe Rubella::Storage, '.length=' do
+
+  it "sets the length to the given value" do
+    storage = Rubella::Storage.new [3, 4, 5]
+
+    storage.length = 2
+
+    expect(storage.length).to eq(2)
+  end
+
+  it "chops the data to the given length" do
+    storage = Rubella::Storage.new [3, 4, 5]
+
+    storage.length = 2
+
+    expect(storage.data.length).to eq(2)
+  end
+
+  it "disables the length chopping, if its set to 0" do
+    storage = Rubella::Storage.new [3, 4, 5]
+
+    storage.length = 0
+
+    expect(storage.data.length).to eq(3)
+  end
+
+  it "grows the data to the given length" do
+    storage = Rubella::Storage.new [[0, 1], [2, 3], [4, 5]]
+
+    storage.length = 5
+
+    expect(storage.data.length).to eq(5)
+  end
+
+  it "grows the data by using the length of the dataset as array length" do
+    storage = Rubella::Storage.new [[0, 1], [2, 3], [4, 5]]
+
+    storage.length = 5
+
+    expect(storage.data[0].length).to eq(2)
+    expect(storage.data[1].length).to eq(2)
+    expect(storage.data[2].length).to eq(2)
+    expect(storage.data[3].length).to eq(2)
+    expect(storage.data[4].length).to eq(2)
+  end
+
+  it "grows the data by using 0 values" do
+    storage = Rubella::Storage.new [[0, 1], [2, 3], [4, 5]]
+
+    storage.length = 5
+
+    expect(storage.data[0][0]).to eq(0)
+    expect(storage.data[0][1]).to eq(0)
+    expect(storage.data[1][0]).to eq(0)
+    expect(storage.data[1][1]).to eq(0)
+  end
+
+  it "does not grow the data, if Storage is empty" do
+    storage = Rubella::Storage.new []
+
+    storage.length = 5
+
+    expect(storage.data.length).to eq(0)
+  end
+
+end