Add solution to Two Fer.

config.json

@@ -895,6 +895,17 @@
       "uuid": "89bd3d71-000f-4cd9-9a84-ad1b22ddbd33",
       "slug": "point-mutations",
       "deprecated": true
+    },
+    {
+      "uuid": "8d345e34-e815-49cd-91ab-ca8db63b07ef",
+      "slug": "two-fer",
+      "core": false,
+      "unlocked_by": null,
+      "difficulty": 1,
+      "topics": [
+        "Control-flow (conditionals)",
+        "Strings"
+      ]
     }
   ],
   "foregone": [

exercises/two-fer/.meta/.version

@@ -0,0 +1 @@
+1

exercises/two-fer/.meta/generator/two_fer_case.rb

@@ -0,0 +1,9 @@
+require 'generator/exercise_case'
+
+class TwoFerCase < Generator::ExerciseCase
+
+  def workload
+    assert_equal { "TwoFer.getResponse('#{input}')" }
+  end
+
+end

exercises/two-fer/.meta/solutions/two_fer.rb

@@ -0,0 +1,13 @@
+module BookKeeping
+  VERSION = 1
+end
+
+class TwoFer
+  def self.getResponse(name)
+    unless name.empty?
+      sprintf("One for %s, one for me.", name)
+    else
+      "One for you, one for me."
+    end
+  end
+end

exercises/two-fer/README.md

@@ -0,0 +1,18 @@
+`Two-fer` or `2-fer` is short for two for one. One for you and one for me.
+
+```
+"One for X, one for me."
+```
+
+When X is a name or "you".
+
+If the given name is "Alice", the result should be "One for Alice, one for me."
+If no name is given, the result should be "One for you, one for me."
+
+* * * *
+
+For installation and learning resources, refer to the
+[exercism help page](http://exercism.io/languages/ruby).
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

exercises/two-fer/two_fer_test.rb

@@ -0,0 +1,42 @@
+require 'minitest/autorun'
+require_relative 'two_fer'
+
+# Common test data version: 1.1.0 c080bdf
+class TwoFerTest < Minitest::Test
+  def test_no_name_given
+    # skip
+    assert_equal "One for you, one for me.", TwoFer.getResponse('')
+  end
+
+  def test_a_name_given
+    skip
+    assert_equal "One for Alice, one for me.", TwoFer.getResponse('Alice')
+  end
+
+  def test_another_name_given
+    skip
+    assert_equal "One for Bob, one for me.", TwoFer.getResponse('Bob')
+  end
+
+  # Problems in exercism evolve over time, as we find better ways to ask
+  # questions.
+  # The version number refers to the version of the problem you solved,
+  # not your solution.
+  #
+  # Define a constant named VERSION inside of the top level BookKeeping
+  # module, which may be placed near the end of your file.
+  #
+  # In your file, it will look like this:
+  #
+  # module BookKeeping
+  #   VERSION = 1 # Where the version number matches the one in the test.
+  # end
+  #
+  # If you are curious, read more about constants on RubyDoc:
+  # http://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/constants.html
+
+  def test_bookkeeping
+    skip
+    assert_equal 1, BookKeeping::VERSION
+  end
+end