Commit fc7a9f1

@@ -0,0 +1,43 @@
+class Cell
+  attr_accessor :x, :y
+
+  def initialize(populated: false)
+    @populated = populated
+  end
+
+  def spawn(world)
+    populated_neighbors = world.neighbors_for(self).find_all { |x| x.populated? }
+    if populated?
+      Cell.new(populated: (2...4).include?(populated_neighbors.count))
+    else
+      Cell.new(populated: populated_neighbors.count == 3)
+    end
+  end
+
+  def neighbor?(other_cell)
+    if matches_x?(other_cell) && one_cell_away(other_cell.y - self.y)
+      return true
+    elsif matches_y?(other_cell) && one_cell_away(other_cell.x - self.x)
+      return true
+    end
+    false
+  end
+
+  def populated?
+    @populated
+  end
+
+  private
+
+  def matches_x?(other_cell)
+    other_cell.x == x
+  end
+
+  def matches_y?(other_cell)
+    other_cell.y == y
+  end
+
+  def one_cell_away(difference)
+    difference.abs == 1
+  end
+end

@@ -0,0 +1,15 @@
+class World
+  def initialize(cells)
+    @cells = cells
+  end
+
+  def neighbors_for(cell)
+    @cells.find_all { |x| cell.neighbor?(x) }
+  end
+
+  def begin
+    @cells.each do |cell|
+      cell.spawn(self)
+    end
+  end
+end

@@ -1,46 +1,3 @@
-class Cell
-  attr_accessor :x, :y
-  def initialize(populated: false)
-    @populated = populated
-  end
-
-  def spawn(world)
-    populated_neighbors = world.neighbors_for(self).find_all { |x| x.populated? }
-    if populated?
-      Cell.new(populated: (2...4).include?(populated_neighbors.count))
-    else
-      Cell.new(populated: populated_neighbors.count == 3)
-    end
-  end
-
-  def neighbor?(other_cell)
-    if matches_x?(other_cell) && one_cell_away(other_cell.y - self.y)
-      return true
-    elsif matches_y?(other_cell) && one_cell_away(other_cell.x - self.x)
-      return true
-    end
-    false
-  end
-
-  def populated?
-    @populated
-  end
-
-  private
-
-  def matches_x?(other_cell)
-    other_cell.x == x
-  end
-
-  def matches_y?(other_cell)
-    other_cell.y == y
-  end
-
-  def one_cell_away(difference)
-    difference.abs == 1
-  end
-end
-
 describe Cell do
   let(:populated_neighbor) { Cell.new(populated: true) }
   let(:unpopulated_neighbor) { Cell.new(populated: false) }

@@ -14,6 +14,8 @@
 # users commonly want.
 #
 # See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+require "world"
+require "cell"
 RSpec.configure do |config|
 # The settings below are suggested to provide a good initial experience
 # with RSpec, but feel free to customize to your heart's content.

@@ -1,19 +1,3 @@
-class World
-  def initialize(cells)
-    @cells = cells
-  end
-
-  def neighbors_for(cell)
-    @cells.find_all { |x| cell.neighbor?(x) }
-  end
-
-  def begin
-    @cells.each do |cell|
-      cell.spawn(self)
-    end
-  end
-end
-
 describe World do
   subject { World.new(cells) }
   let(:cells) { [neighbor, other_cell] }