Adding failing test for timezone/day overlaps

.ruby-gemset

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

.ruby-version

@@ -0,0 +1 @@
+ruby-2.0.0

Gemfile

@@ -0,0 +1,4 @@
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in rubysunrise.gemspec
+gemspec

Gemfile.lock

@@ -0,0 +1,20 @@
+PATH
+  remote: .
+  specs:
+    RubySunrise (0.3)
+      tzinfo
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    atomic (1.1.14)
+    thread_safe (0.1.3)
+      atomic
+    tzinfo (1.1.0)
+      thread_safe (~> 0.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  RubySunrise!

test/sunsettest.rb

@@ -63,6 +63,13 @@
     @calc.compute_utc_official_sunset.should eql(DateTime.parse("#{@date.strftime}T21:59:00-00:00"))
   end
 
+  it "returns correct UTC official sunset time for time zones in different days" do
+    date = Date.parse('2013-10-06') #06 October 2013 (MDT)
+    calc = SolarEventCalculator.new(date, BigDecimal.new("39.7643389"), BigDecimal.new("-104.8551114"))
+    # Sunset in CO is 18:34 on Oct, 6. In UTC time this should be 00:34 on Oct, 7
+    calc.compute_utc_official_sunset.should eql(DateTime.parse("#{date.next_day.strftime}T00:34:00+00:00"))
+  end
+
   it "returns correct UTC nautical sunset time" do
     @calc.compute_utc_nautical_sunset.should eql(DateTime.parse("#{@date.strftime}T23:00:00-00:00"))
   end