module ActiveSupport module Testing class SimpleStubs # :nodoc: Stub = Struct.new(:object, :method_name, :original_method) def initialize @stubs = {} end def stub_object(object, method_name, return_value) key = [object.object_id, method_name] if stub = @stubs[key] unstub_object(stub) end new_name = "__simple_stub__#{method_name}" @stubs[key] = Stub.new(object, method_name, new_name) object.singleton_class.send :alias_method, new_name, method_name object.define_singleton_method(method_name) { return_value } end def unstub_all! @stubs.each_value do |stub| unstub_object(stub) end @stubs = {} end private def unstub_object(stub) singleton_class = stub.object.singleton_class singleton_class.send :undef_method, stub.method_name singleton_class.send :alias_method, stub.method_name, stub.original_method singleton_class.send :undef_method, stub.original_method end end # Containing helpers that helps you test passage of time. module TimeHelpers # Changes current time to the time in the future or in the past by a given time difference by # stubbing +Time.now+ and +Date.today+. # # Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00 # travel 1.day # Time.current # => Sun, 10 Nov 2013 15:34:49 EST -05:00 # Date.current # => Sun, 10 Nov 2013 # # This method also accepts a block, which will return the current time back to its original # state at the end of the block: # # Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00 # travel 1.day do # User.create.created_at # => Sun, 10 Nov 2013 15:34:49 EST -05:00 # end # Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00 def travel(duration, &block) travel_to Time.now + duration, &block end # Changes current time to the given time by stubbing +Time.now+ and # +Date.today+ to return the time or date passed into this method. # # Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00 # travel_to Time.new(2004, 11, 24, 01, 04, 44) # Time.current # => Wed, 24 Nov 2004 01:04:44 EST -05:00 # Date.current # => Wed, 24 Nov 2004 # # Dates are taken as their timestamp at the beginning of the day in the # application time zone. Time.current returns said timestamp, # and Time.now its equivalent in the system time zone. Similarly, # Date.current returns a date equal to the argument, and # Date.today the date according to Time.now, which may # be different. (Note that you rarely want to deal with Time.now, # or Date.today, in order to honor the application time zone # please always use Time.current and Date.current.) # # Note that the usec for the time passed will be set to 0 to prevent rounding # errors with external services, like MySQL (which will round instead of floor, # leading to off-by-one-second errors). # # This method also accepts a block, which will return the current time back to its original # state at the end of the block: # # Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00 # travel_to Time.new(2004, 11, 24, 01, 04, 44) do # Time.current # => Wed, 24 Nov 2004 01:04:44 EST -05:00 # end # Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00 def travel_to(date_or_time) if date_or_time.is_a?(Date) && !date_or_time.is_a?(DateTime) now = date_or_time.midnight.to_time else now = date_or_time.to_time.change(usec: 0) end simple_stubs.stub_object(Time, :now, now) simple_stubs.stub_object(Date, :today, now.to_date) simple_stubs.stub_object(DateTime, :now, now.to_datetime) if block_given? begin yield ensure travel_back end end end # Returns the current time back to its original state, by removing the stubs added by # `travel` and `travel_to`. # # Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00 # travel_to Time.new(2004, 11, 24, 01, 04, 44) # Time.current # => Wed, 24 Nov 2004 01:04:44 EST -05:00 # travel_back # Time.current # => Sat, 09 Nov 2013 15:34:49 EST -05:00 def travel_back simple_stubs.unstub_all! end private def simple_stubs @simple_stubs ||= SimpleStubs.new end end end end