ruby - gigasecond

ruby/gigasecond/README.md

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+# Gigasecond
+
+Calculate the moment when someone has lived for 10^9 seconds.
+
+A gigasecond is 10^9 (1,000,000,000) seconds.
+
+* * * *
+
+For installation and learning resources, refer to the
+[exercism help page](http://exercism.io/languages/ruby).
+
+For running the tests provided, you will need the Minitest gem. Open a
+terminal window and run the following command to install minitest:
+
+    gem install minitest
+
+If you would like color output, you can `require 'minitest/pride'` in
+the test file, or note the alternative instruction, below, for running
+the test file.
+
+Run the tests from the exercise directory using the following command:
+
+    ruby gigasecond_test.rb
+
+To include color from the command line:
+
+    ruby -r minitest/pride gigasecond_test.rb
+
+
+## Source
+
+Chapter 9 in Chris Pine's online Learn to Program tutorial. [http://pine.fm/LearnToProgram/?Chapter=09](http://pine.fm/LearnToProgram/?Chapter=09)
+
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

ruby/gigasecond/gigasecond.rb

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+class Gigasecond
+  GIGASECOND = 10 ** 9
+
+  def self.from(start)
+    start + GIGASECOND
+  end
+end

ruby/gigasecond/gigasecond_test.rb

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+require 'minitest/autorun'
+require_relative 'gigasecond'
+
+# Common test data version: 1.1.0 5506bac
+class GigasecondTest < Minitest::Test
+  def test_date_only_specification_of_time
+    # skip
+    assert_equal Time.utc(2043, 1, 1, 1, 46, 40), Gigasecond.from(Time.utc(2011, 4, 25, 0, 0, 0))
+  end
+
+  def test_second_test_for_date_only_specification_of_time
+    # skip
+    assert_equal Time.utc(2009, 2, 19, 1, 46, 40), Gigasecond.from(Time.utc(1977, 6, 13, 0, 0, 0))
+  end
+
+  def test_third_test_for_date_only_specification_of_time
+    # skip
+    assert_equal Time.utc(1991, 3, 27, 1, 46, 40), Gigasecond.from(Time.utc(1959, 7, 19, 0, 0, 0))
+  end
+
+  def test_full_time_specified
+    # skip
+    assert_equal Time.utc(2046, 10, 2, 23, 46, 40), Gigasecond.from(Time.utc(2015, 1, 24, 22, 0, 0))
+  end
+
+  def test_full_time_with_day_roll_over
+    # skip
+    assert_equal Time.utc(2046, 10, 3, 1, 46, 39), Gigasecond.from(Time.utc(2015, 1, 24, 23, 59, 59))
+  end
+end