Add vanity specs.

lib/phony/vanity.rb

@@ -20,7 +20,7 @@ def self.replace number
     end
 
     # Returns true if there is a character in the number
-    # after the first four numbers.
+    # after the first three numbers.
     #
     @@vanity_regexp = /\A\d{3}[a-zA-Z]{6,12}\Z/
     def self.vanity? number

spec/lib/phony/vanity_spec.rb

@@ -0,0 +1,30 @@
+# encoding: utf-8
+#
+require 'spec_helper'
+
+describe Phony::Vanity do
+
+  let(:vanity) { described_class }
+
+  describe '.replace' do
+    it 'replaces letters with digits' do
+      vanity.replace('1-800-HELLO').should == '1-800-43556'
+    end
+  end
+
+  describe '.vanity?' do
+    it 'returns true on a vanity number' do
+      vanity.vanity?('123HELLOES').should == true
+    end
+    it 'returns false on a non-vanity number' do
+      vanity.vanity?('1234355637').should == false
+    end
+  end
+
+  describe '.normalized' do
+    it 'normalizes the vanity number' do
+      vanity.normalized('1-800-HELLO').should == '1800HELLO'
+    end
+  end
+
+end