2 files changed, 46 insertions, 12 deletions
diff --git a/CLI/ruby/lib/game_of_life.rb b/CLI/ruby/lib/game_of_life.rb
index a2ce27a..2ff548c 100644
--- a/CLI/ruby/lib/game_of_life.rb
+++ b/CLI/ruby/lib/game_of_life.rb
@@ -43,6 +43,14 @@ module GameOfLife
           "must be between 1 and #{max_height} (current terminal height)"
       end
 
+      fail GameOfLife::Error, "Invalid --live-cell value. must be a single character" if options["live-cell"].length > 1
+
+      fail GameOfLife::Error, "Invalid --dead-cell value. must be a single character" if options["dead-cell"].length > 1
+
+      if options["dead-cell"] == options["live-cell"]
+        fail GameOfLife::Error, "Invalid --dead-cell value. must be a different character than --live-cell"
+      end
+
       {
         # Defaults the hight to less then the height of the terminal to allow banner info
         # and an extra emtpy line to avoid triggering terminal scroll while flushing
diff --git a/CLI/ruby/spec/game_of_life_spec.rb b/CLI/ruby/spec/game_of_life_spec.rb
index 5e99ca8..89a0c87 100644
--- a/CLI/ruby/spec/game_of_life_spec.rb
+++ b/CLI/ruby/spec/game_of_life_spec.rb
@@ -2,6 +2,13 @@
 
 RSpec.describe GameOfLife do
   describe ".parsed_options" do
+    let(:options) do
+      {
+        "live-cell" => "L",
+        "dead-cell" => "D",
+      }
+    end
+
     before do
       console = instance_double("<File:/dev/tty>")
       allow(IO).to receive(:console).and_return(console)
@@ -10,68 +17,87 @@ RSpec.describe GameOfLife do
 
     context "with options['delay']" do
       it "raises GameOfLife::Error when negative" do
-        options = { "delay" => -13 }
+        options["delay"] = -13
         expect { described_class.parsed_options(options) }.to raise_error(GameOfLife::Error, /Invalid --delay value/)
       end
 
       it "uses options['delay'] when posotive" do
-        options = { "delay" => 15 }
+        options["delay"] = 15
         expect(described_class.parsed_options(options)).to include("delay" => 15)
       end
     end
 
     context "with options['width']" do
       it "raises GameOfLife::Error when < 1" do
-        options = { "width" => 0 }
+        options["width"] = 0
         expect { described_class.parsed_options(options) }.to raise_error(GameOfLife::Error, /Invalid --width value/)
       end
 
       it "raises GameOfLife::Error when > IO.console.winsize[1]" do
-        options = { "width" => 23 }
+        options["width"] = 23
         expect { described_class.parsed_options(options) }.to raise_error(GameOfLife::Error, /Invalid --width value/)
       end
 
       it "uses options['width']" do
-        options = { "width" => 15 }
+        options["width"] = 15
         expect(described_class.parsed_options(options)).to include("width" => 15)
       end
 
       it "uses IO.console.winsize[1] as default" do
-        expect(described_class.parsed_options({})).to include("width" => 20)
+        expect(described_class.parsed_options(options)).to include("width" => 20)
       end
     end
 
     context "with options['height']" do
       it "raises GameOfLife::Error < 1" do
-        options = { "height" => 0 }
+        options["height"] = 0
         expect { described_class.parsed_options(options) }.to raise_error(GameOfLife::Error, /Invalid --height value/)
       end
 
       it "raises GameOfLife::Error when > winsize[0] - 2" do
-        options = { "height" => 9 }
+        options["height"] = 9
         expect { described_class.parsed_options(options) }.to raise_error(GameOfLife::Error, /Invalid --height value/)
       end
 
       it "uses options['height']" do
-        options = { "height" => 5 }
+        options["height"] = 5
         expect(described_class.parsed_options(options)).to include("height" => 5)
       end
 
       it "uses IO.console.winsize[0] - 2 as default" do
-        expect(described_class.parsed_options({})).to include("height" => 8)
+        expect(described_class.parsed_options(options)).to include("height" => 8)
+      end
+    end
+
+    context "with options['live-cell']" do
+      it "raises GameOfLife::Error if live-cell is multiple characters" do
+        options["live-cell"] = "LL"
+        expect { described_class.parsed_options(options) }.to raise_error(GameOfLife::Error, /Invalid --live-cell /)
+      end
+    end
+
+    context "with options['dead-cell']" do
+      it "raises GameOfLife::Error if dead-cell is multiple characters" do
+        options["dead-cell"] = "DD"
+        expect { described_class.parsed_options(options) }.to raise_error(GameOfLife::Error, /Invalid --dead-cell /)
+      end
+
+      it "raises GameOfLife::Error if dead-cell is same as live-cell character" do
+        options = { "live-cell" => "X", "dead-cell" => "X" }
+        expect { described_class.parsed_options(options) }.to raise_error(GameOfLife::Error, /Invalid --dead-cell /)
       end
     end
 
     context "with options['seed']" do
       it "uses options['seed']" do
-        options = { "seed" => 1337 }
+        options["seed"] = 1337
         expect(described_class.parsed_options(options)).to include("seed" => 1337)
       end
 
       # rubocop:disable RSpec/AnyInstance
       it "defaults to Kernel.random" do
         allow_any_instance_of(Kernel).to receive(:rand).and_return "random"
-        expect(described_class.parsed_options({})).to include("seed" => "random")
+        expect(described_class.parsed_options(options)).to include("seed" => "random")
       end
       # rubocop:enable RSpec/AnyInstance
     end