diff --git a/rb/glicko2.rb b/rb/glicko2.rb
index 8fc2f83..80bcf21 100755
--- a/rb/glicko2.rb
+++ b/rb/glicko2.rb
@@ -214,17 +214,3 @@ class Glicko2
 		end
 end
 
-
-A = Glicko2.new(1500.0, 200.0, 0.06)
-B = Glicko2.new(1400.0,  30.0, 0.06)
-C = Glicko2.new(1550.0, 100.0, 0.06)
-D = Glicko2.new(1700.0, 300.0, 0.06)
-
-A.add_win(B)
-A.add_loss(C)
-A.add_result(D,0.0)
-
-A.update()
-
-print "rating ", A.rating, " deviation ", A.deviation
-
diff --git a/rb/glicko2_test.rb b/rb/glicko2_test.rb
new file mode 100644
index 0000000..36585a6
--- /dev/null
+++ b/rb/glicko2_test.rb
@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+
+require 'glicko2'
+require 'test/unit'
+
+class TestGlicko2 < Test::Unit::TestCase
+
+	def test_simple
+		a = Glicko2.new(1500.0, 200.0, 0.06)
+		b = Glicko2.new(1400.0,  30.0, 0.06)
+		c = Glicko2.new(1550.0, 100.0, 0.06)
+		d = Glicko2.new(1700.0, 300.0, 0.06)
+		
+		a.add_win(b)
+		a.add_loss(c)
+		a.add_result(d,0.0)
+		
+		assert_equal(1500.0, a.rating)
+		assert_equal(200.0, a.deviation)
+		
+		a.update()
+		
+		assert_in_delta(1464.05,a.rating,0.01)
+		assert_in_delta(151.516,a.deviation,0.01)
+	end
+end
+