Try minitest with ruby

ruby/2015/1/bin/problem

@@ -0,0 +1,7 @@
+#/usr/bin/env ruby
+require "directions"
+
+input = STDIN.read.chomp
+directions = Directions.for input
+puts "Part 1: #{directions.final_floor}"
+puts "Part 2: #{directions.first_basement_step}"

ruby/2015/1/lib/directions.rb

@@ -0,0 +1,18 @@
+class Directions
+  attr_reader :steps
+  def initialize(steps)
+    @steps = steps
+  end
+
+  def self.for(string)
+    new string.split("")
+  end
+
+  def final_floor
+    steps.reduce(0) { |current_floor, step| step == "(" ? current_floor + 1 : current_floor - 1 }
+  end
+
+  def first_basement_step
+    steps.reduce([0, 0]) { |acc, step| acc[0] >= 0 ? (step == "(" ? [acc[0] + 1, acc[1] + 1] : [acc[0] - 1, acc[1] + 1]) : acc }[1]
+  end
+end

ruby/2015/1/problem.rb

@@ -1,15 +1,5 @@
-input = STDIN.read.split("")
-counts = input.tally
-final_floor = counts["("] - counts[")"]
-puts "Part 1: #{final_floor}"
+require "directions"
 
-floor = 0
-steps = 0
-input.each do |char|
-  floor += 1 if char == "("
-  floor -= 1 if char == ")"
-  steps += 1
-  break if floor < 0
-end
-
-puts "Part 2: #{steps}"
+input = STDIN.read.chomp
+directions = Directions.for input
+puts "Part 1: #{directions.final_floor}"

ruby/2015/1/test/test_directions.rb

@@ -0,0 +1,30 @@
+require "minitest/autorun"
+require "directions"
+
+class TestDirections < ::Minitest::Test
+  def test_zero_examples
+    assert_equal(0, Directions.for("(())").final_floor)
+    assert_equal(0, Directions.for("()()").final_floor)
+  end
+
+  def test_three_examples
+    assert_equal(3, Directions.for("(((").final_floor)
+    assert_equal(3, Directions.for("(()(()(").final_floor)
+    assert_equal(3, Directions.for("))(((((").final_floor)
+  end
+
+  def test_negative_one_examples
+    assert_equal(-1, Directions.for("())").final_floor)
+    assert_equal(-1, Directions.for("))(").final_floor)
+  end
+
+  def test_negative_three_examples
+    assert_equal(-3, Directions.for(")))").final_floor)
+    assert_equal(-3, Directions.for(")())())").final_floor)
+  end
+
+  def test_first_basement_floor
+    assert_equal(1, Directions.for(")").first_basement_step)
+    assert_equal(5, Directions.for("()())").first_basement_step)
+  end
+end

ruby/bin/run

@@ -4,11 +4,11 @@ year=$1
 day=$2
 
 mkdir -p $year/$day
-source_file=$(ls $year/$day/*.rb)
+source_file=$(ls $year/$day/bin/problem)
 
 if [[ -z $source_file ]] ; then
     echo "No ruby source file found in $year/$day"
     exit 1
 fi
 
-time (cat ../data/$year/$day/input.txt | ruby $source_file)
+time (cat ../data/$year/$day/input.txt | ruby -I$year/$day/lib $source_file)