Ruby kata: The Ghost of Christmas Past

README.md

The Ghost of Christmas Past 🎅🎄👻

Christmas, this year, falls on a Wednesday!

But on which day did Christmas fall in years past?

Problem Description

Write a Ruby class that returns the correct weekday of Christmas Day for previous years.

Requirements and Constraints

Requirements

Your code should return the name of the day of the week that Christmas Day was:

• Officially celebrated
• In England
• Using the relative local date and time

Constraints

You may not use Ruby's Date or Time classes, nor any other third party library to perform date computations for you. Your solution should be derived from first-principles, implementing the logic yourself.

Input Specifications

See the attached tests.

Output Specifications

See the attached tests. All tests must pass!

Examples and Test Cases

See the attached tests.

Getting started

1. Copy/paste the main.rb and test.rb files below into your working directory.
2. run $ ruby test.rb to see the status of the tests.

main.rb

class ChristmasDay
end

test.rb

require_relative 'main'
require 'minitest/autorun'

class ChristmasDayTest < Minitest::Test
  def test_returns_the_correct_weekday_for_2025
    skip 'Not implemented'
    assert_raises { ChristmasDay.new(2025).weekday }
  end

  def test_returns_the_correct_weekday_for_2024
    skip 'Not implemented'
    assert_equal 'Wednesday', ChristmasDay.new(2024).weekday
  end

  def test_returns_the_correct_weekday_for_2001
    skip 'Not implemented'
    assert_equal 'Tuesday', ChristmasDay.new(2001).weekday
  end

  def test_returns_the_correct_weekday_for_1900
    skip 'Not implemented'
    assert_equal 'Tuesday', ChristmasDay.new(1900).weekday
  end

  def test_returns_the_correct_weekday_for_1752
    skip 'Not implemented'
    assert_equal 'Monday', ChristmasDay.new(1752).weekday
  end

  def test_returns_the_correct_weekday_for_1751
    skip 'Not implemented'
    assert_equal 'Wednesday', ChristmasDay.new(1751).weekday
  end

  def test_returns_the_correct_weekday_for_1660
    skip 'Not implemented'
    assert_equal 'Tuesday', ChristmasDay.new(1660).weekday
  end

  def test_returns_the_correct_weekday_for_1659
    skip 'Not implemented'
    assert_raises { ChristmasDay.new(1659).weekday }
  end

  def test_returns_the_correct_weekday_for_1644
    skip 'Not implemented'
    assert_raises { ChristmasDay.new(1644).weekday }
  end

  def test_returns_the_correct_weekday_for_1643
    skip 'Not implemented'
    assert_equal 'Monday', ChristmasDay.new(1643).weekday
  end

  def test_returns_the_correct_weekday_for_1066
    skip 'Not implemented'
    assert_equal 'Monday', ChristmasDay.new(1066).weekday
  end

  def test_returns_the_correct_weekday_for_597
    skip 'Not implemented'
    assert_equal 'Wednesday', ChristmasDay.new(597).weekday
  end

  def test_returns_the_correct_weekday_for_596
    skip 'Not implemented'
    assert_raises { ChristmasDay.new(596).weekday }
  end
end