calculating the neighbours of 1,1

lib/2011_03_12_game_of_life.rb

@@ -0,0 +1,5 @@
+def neighbours_of row, column
+  [[0,0],[0,1],[0,2],
+  [1,0],[1,2],
+  [2,0],[2,1],[2,2]]
+end

spec/2011_03_12_game_of_life_spec.rb

@@ -1 +1,32 @@
-require 'spec_helper'
+require 'spec_helper'
+
+describe "Game of Life" do
+  context "Working out neighbours" do
+    context "a cell located at position 1,1" do
+      it "has a neighbour at 0,0" do
+        neighbours_of(1,1).should include([0,0])
+      end
+      it "has a neighbour at 0,1" do
+        neighbours_of(1,1).should include([0,1])
+      end
+      it "has a neighbour at 0,2" do
+        neighbours_of(1,1).should include([0,2])
+      end
+      it "has a neighbour at 1,0" do
+        neighbours_of(1,1).should include([1,0])
+      end
+      it "has a neighbour at 1,2" do
+        neighbours_of(1,1).should include([1,2])
+      end
+      it "has a neighbour at 2,0" do
+        neighbours_of(1,1).should include([2,0])
+      end
+      it "has a neighbour at 2,1" do
+        neighbours_of(1,1).should include([2,1])
+      end
+      it "has a neighbour at 2,2" do
+        neighbours_of(1,1).should include([2,2])
+      end
+    end
+  end
+end