Using time travel to unit test time-based data
Searching for a way to test time-based data in ruby, I came across an excellent suggestion from Rick Olson (technoweenie). I've cleaned it a little to make it clearer to read, but the main credit should go to Rick.
1 2 class << Time 3 unless method_defined? :now_before_time_travel 4 alias_method :now_before_time_travel, :now 5 end 6 7 def now 8 @now || now_before_time_travel 9 end 10 11 def travel_to(time, &block) 12 @now = time 13 block.call 14 ensure 15 @now = nil 16 end 17 end
1 2 def test_something_involving_time 3 account = Time.travel_to(creation_time = Time.now) do 4 Account.new 5 end 6 7 assert_equal creation_time, account.creation_time 8 end
