require_relative '../../spec_helper'
require 'date'

describe "Date.valid_date?" do
  # reference:
  # October 1582 (the Gregorian calendar, Civil Date)
  #   S   M  Tu   W  Th   F   S
  #       1   2   3   4  15  16
  #  17  18  19  20  21  22  23
  #  24  25  26  27  28  29  30
  #  31
  it "returns true if it is a valid civil date" do
    Date.valid_date?(1582, 10, 15).should == true
    Date.valid_date?(1582, 10, 14, Date::ENGLAND).should == true
  end

  it "returns false if it is not a valid civil date" do
    Date.valid_date?(1582, 10, 14).should == false
  end

  it "handles negative months and days" do
    # October 1582 (the Gregorian calendar, Civil Date)
    #     S   M  Tu   W  Th   F   S
    #       -21 -20 -19 -18 -17 -16
    #   -15 -14 -13 -12 -11 -10  -9
    #    -8  -7  -6  -5  -4  -3  -2
    #    -1
    Date.valid_date?(1582, -3, -22).should == false
    Date.valid_date?(1582, -3, -21).should == true
    Date.valid_date?(1582, -3, -18).should == true
    Date.valid_date?(1582, -3, -17).should == true

    Date.valid_date?(2007, -11, -10).should == true
    Date.valid_date?(2008, -11, -10).should == true
  end
end
