fcUtilSpec.coffee

#
# Copyright (C) 2016 - present Instructure, Inc.
#
# This file is part of Canvas.
#
# Canvas is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, version 3 of the License.
#
# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.

define [
  'compiled/util/fcUtil',
  'timezone'
  'timezone/America/Denver'
], (fcUtil, tz, denver) ->

  QUnit.module "Calendar",
    setup: ->
      @snapshot = tz.snapshot()
      tz.changeZone(denver, 'America/Denver')

    teardown: ->
      tz.restore(@snapshot)

  test 'addMinuteDelta: works with no DST shift', ->
    datetime1 = fcUtil.wrap('2017-01-01T00:00:00-07:00')
    datetime2 = fcUtil.addMinuteDelta(datetime1, 1440)
    equal tz.format(fcUtil.unwrap(datetime2), '%FT%T%z'), '2017-01-02T00:00:00-0700'

    datetime1 = fcUtil.wrap('2017-01-02T00:00:00-07:00')
    datetime2 = fcUtil.addMinuteDelta(datetime1, -1440)
    equal tz.format(fcUtil.unwrap(datetime2), '%FT%T%z'), '2017-01-01T00:00:00-0700'

  test 'addMinuteDelta: works across standard -> DST shift', ->
    datetime1 = fcUtil.wrap('2017-03-12T00:00:00-07:00')
    datetime2 = fcUtil.addMinuteDelta(datetime1, 1440)
    equal tz.format(fcUtil.unwrap(datetime2), '%FT%T%z'), '2017-03-13T00:00:00-0600'

    datetime1 = fcUtil.wrap('2017-11-06T00:00:00-07:00')
    datetime2 = fcUtil.addMinuteDelta(datetime1, -1440)
    equal tz.format(fcUtil.unwrap(datetime2), '%FT%T%z'), '2017-11-05T00:00:00-0600'

  test 'addMinuteDelta: works across DST -> standard shift', ->
    datetime1 = fcUtil.wrap('2017-11-05T00:00:00-06:00')
    datetime2 = fcUtil.addMinuteDelta(datetime1, 1440)
    equal tz.format(fcUtil.unwrap(datetime2), '%FT%T%z'), '2017-11-06T00:00:00-0700'

    datetime1 = fcUtil.wrap('2017-03-13T00:00:00-06:00')
    datetime2 = fcUtil.addMinuteDelta(datetime1, -1440)
    equal tz.format(fcUtil.unwrap(datetime2), '%FT%T%z'), '2017-03-12T00:00:00-0700'