Commit 40e98c3

@@ -0,0 +1,50 @@
+require "spec_helper"
+
+def factorial(n)
+  if n == 0
+    1
+  else
+    n * factorial(n-1)
+  end
+end
+
+def fibonacci(n)
+  n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2)
+end
+
+def fibonacci_enumerator
+  Enumerator.new do |yielder|
+    i, j = 0, 1
+    loop do
+      i, j = j, i + j
+      yielder.yield i
+    end
+  end
+end
+
+describe "fibonacci" do
+  let(:sut) { Fibonacci.new }
+
+  xit "should return the correct result" do
+    #0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144
+    sut.get(0).should == 0
+    sut.get(1).should == 1
+  end
+
+  it "should return the first 10 numbers in fibonacci" do
+    f = ->(x){ x < 2 ? x : f.call(x-1) + f.call(x-2) }
+    20.times do |n|
+      fibonacci(n).should == f.call(n)
+    end
+  end
+
+  it "can enumerate forever" do
+    fibonacci_enumerator.take_while { |n| n < 1000 }
+  end
+
+  it "can do factorial" do
+    (1..10).each do |n|
+      factorial(n).should == (1..n).inject { |total, i| (i) * total }
+    end
+  end
+end