Enable guard. Require HMS 0.0.3 for correct to_f behavior.

Guardfile

@@ -0,0 +1,10 @@
+guard 'bundler' do
+  watch('Gemfile')
+end
+
+guard 'minitest' do
+  watch(%r|^test/unit/test_(.*)\.rb|)
+  watch(%r|^lib/*\.rb|){'test'}
+  watch(%r{^lib/.*/([^/]+)\.rb$}){|m| "test/unit/test_#{m[1]}.rb"}
+  watch(%r|^test/helper\.rb|){'test'}
+end

enumstats.gemspec

@@ -18,4 +18,10 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'rake'
   gem.add_development_dependency 'open4'
   gem.add_development_dependency 'pry'
+  gem.add_development_dependency 'hms', '~> 0.0.3'
+
+  gem.add_development_dependency 'guard-minitest', '~> 0.5'
+  gem.add_development_dependency 'guard-bundler', '~> 1.0'
+  gem.add_development_dependency 'coolline', '~> 0.3'
+  gem.add_development_dependency 'growl'
 end

test/unit/test_enumerable_stats.rb

@@ -1,4 +1,5 @@
 require 'helper'
+require 'hms'
 
 class TestEnumerableStats < MiniTest::Unit::TestCase
   def test_stats_example1
@@ -44,4 +45,14 @@ def test_median
     samples = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18]
     assert_in_delta(9, samples.median, 0.0001)
   end
+
+  def test_stats_duration
+    samples = [5.0, 10.0, 15.0].map{|f| HMS::Duration.new(f)}
+    assert_in_delta(10.0, samples.mean, 1e-6)
+    assert_in_delta(25.0, samples.variance, 1e-6)
+    assert_in_delta(5.0, samples.standard_deviation, 1e-6)
+    assert_in_delta(30.0, samples.sum, 1e-6)
+    assert_in_delta(5.0, samples.min, 1e-6)
+    assert_in_delta(15.0, samples.max, 1e-6)
+  end
 end