require File.join(File.expand_path(File.dirname(__FILE__)), 'test_utils')

include TZInfo

using TaintExt if Module.const_defined?(:TaintExt)

class TCTimezone < Minitest::Test

  class BlockCalled < StandardError
  end
  
  class TestTimezone < Timezone
    def self.new(identifier, period_for_utc = nil, periods_for_local = nil, expected = nil)
      t = super()
      t.send(:setup, identifier, period_for_utc, periods_for_local, expected)
      t
    end
    
    def identifier
      @identifier
    end
    
    def period_for_utc(utc)
      utc = TimeOrDateTime.wrap(utc)
      raise "Unexpected utc #{utc} in period_for_utc" unless @expected.eql?(utc)
      @period_for_utc
    end
    
    def periods_for_local(local)            
      local = TimeOrDateTime.wrap(local)
      raise "Unexpected local #{local} in periods_for_local" unless @expected.eql?(local)
      @periods_for_local.clone        
    end
    
    def transitions_up_to(utc_to, utc_from = nil)
      raise 'transitions_up_to called'
    end
    
    private
      def setup(identifier, period_for_utc, periods_for_local, expected)
        @identifier = identifier
        @period_for_utc = period_for_utc
        @periods_for_local = periods_for_local || []
        @expected = TimeOrDateTime.wrap(expected)
      end
  end
  
  class OffsetsUpToTestTimezone < Timezone
    def self.new(identifier, expected_utc_to, expected_utc_from, transitions_up_to)
      t = super()
      t.send(:setup, identifier, expected_utc_to, expected_utc_from, transitions_up_to)
      t      
    end
    
    def identifier
      @identifier
    end
    
    def period_for_utc(utc)
      raise 'period_for_utc called'
    end
    
    def periods_for_local(local)
      raise 'periods_for_local called'
    end
    
    def transitions_up_to(utc_to, utc_from = nil)
      utc_to = TimeOrDateTime.wrap(utc_to)
      raise "Unexpected utc_to #{utc_to || 'nil'} in transitions_up_to" unless @expected_utc_to.eql?(utc_to)
      
      utc_from = utc_from ? TimeOrDateTime.wrap(utc_from) : nil
      raise "Unexpected utc_from #{utc_from || 'nil'} in transitions_up_to" unless @expected_utc_from.eql?(utc_from)
      
      if utc_from && utc_to <= utc_from
        raise ArgumentError, 'utc_to must be greater than utc_from'
      end
      
      @transitions_up_to
    end
    
    private
    
    def setup(identifier, expected_utc_to, expected_utc_from, transitions_up_to)
      @identifier = identifier
      @expected_utc_to = TimeOrDateTime.wrap(expected_utc_to)
      @expected_utc_from = expected_utc_from ? TimeOrDateTime.wrap(expected_utc_from) : nil
      @transitions_up_to = transitions_up_to
    end
  end
  
  class OffsetsUpToNoTransitionsTestTimezone < Timezone
    def self.new(identifier, expected_utc_to, expected_utc_from, period_for_utc)
      t = super()
      t.send(:setup, identifier, expected_utc_to, expected_utc_from, period_for_utc)
      t      
    end
    
    def identifier
      @identifier
    end
    
    def period_for_utc(utc)
      utc = TimeOrDateTime.wrap(utc)
      
      raise "Unexpected utc #{utc} in period_for_utc (should be utc_from)" if @expected_utc_from && !@expected_utc_from.eql?(utc)
      raise "Unexpected utc #{utc} in period_for_utc (should be < utc_to)" if !@expected_utc_from && @expected_utc_to <= utc
      
      @period_for_utc
    end
    
    def periods_for_local(local)
      raise 'periods_for_local called'
    end
    
    def transitions_up_to(utc_to, utc_from = nil)
      utc_to = TimeOrDateTime.wrap(utc_to)
      raise "Unexpected utc_to #{utc_to || 'nil'} in transitions_up_to" unless @expected_utc_to.eql?(utc_to)
      
      utc_from = utc_from ? TimeOrDateTime.wrap(utc_from) : nil
      raise "Unexpected utc_from #{utc_from || 'nil'} in transitions_up_to" unless @expected_utc_from.eql?(utc_from)
      
      if utc_from && utc_to <= utc_from
        raise ArgumentError, 'utc_to must be greater than utc_from'
      end
      
      []
    end
    
    private
    
    def setup(identifier, expected_utc_to, expected_utc_from, period_for_utc)
      @identifier = identifier
      @expected_utc_to = TimeOrDateTime.wrap(expected_utc_to)
      @expected_utc_from = expected_utc_from ? TimeOrDateTime.wrap(expected_utc_from) : nil
      @period_for_utc = period_for_utc
    end
  end
  
  class TestTimezoneTransition < TimezoneTransition
    def initialize(offset, previous_offset, at)
      super(offset, previous_offset)
      @at = TimeOrDateTime.wrap(at)
    end
    
    def at
      @at
    end
  end
  
  def setup
    @orig_default_dst = Timezone.default_dst
    @orig_data_source = DataSource.get
    Timezone.send :init_loaded_zones
  end
  
  def teardown
    Timezone.default_dst = @orig_default_dst
    DataSource.set(@orig_data_source)
  end
  
  def test_default_dst_initial_value
    assert_nil(Timezone.default_dst)
  end
  
  def test_set_default_dst
    Timezone.default_dst = true
    assert_equal(true, Timezone.default_dst)
    Timezone.default_dst = false
    assert_equal(false, Timezone.default_dst)
    Timezone.default_dst = nil
    assert_nil(Timezone.default_dst)
    Timezone.default_dst = 0
    assert_equal(true, Timezone.default_dst)
  end
  
  def test_get_valid_1
    tz = Timezone.get('Europe/London')
    
    assert_kind_of(DataTimezone, tz)
    assert_equal('Europe/London', tz.identifier)
  end
  
  def test_get_valid_2
    tz = Timezone.get('UTC')
    
    # ZoneinfoDataSource doesn't return LinkedTimezoneInfo for any timezone.
    if DataSource.get.load_timezone_info('UTC').kind_of?(LinkedTimezoneInfo)
      assert_kind_of(LinkedTimezone, tz)  
    else
      assert_kind_of(DataTimezone, tz)
    end
    
    assert_equal('UTC', tz.identifier)
  end
  
  def test_get_valid_3
    tz = Timezone.get('America/Argentina/Buenos_Aires')
    
    assert_kind_of(DataTimezone, tz)
    assert_equal('America/Argentina/Buenos_Aires', tz.identifier)
  end
  
  def test_get_same_instance
    tz1 = Timezone.get('Europe/London')
    tz2 = Timezone.get('Europe/London')
    assert_same(tz1, tz2)
  end
  
  def test_get_not_exist
    assert_raises(InvalidTimezoneIdentifier) { Timezone.get('Nowhere/Special') }
  end
  
  def test_get_invalid
    assert_raises(InvalidTimezoneIdentifier) { Timezone.get('../Definitions/UTC') }
  end
  
  def test_get_nil
    assert_raises(InvalidTimezoneIdentifier) { Timezone.get(nil) }
  end
  
  def test_get_case    
    Timezone.get('Europe/Prague')
    assert_raises(InvalidTimezoneIdentifier) { Timezone.get('Europe/prague') }
  end
  
  def test_get_proxy_valid
    proxy = Timezone.get_proxy('Europe/London')
    assert_kind_of(TimezoneProxy, proxy)
    assert_equal('Europe/London', proxy.identifier)
  end
  
  def test_get_proxy_not_exist
    proxy = Timezone.get_proxy('Not/There')
    assert_kind_of(TimezoneProxy, proxy)
    assert_equal('Not/There', proxy.identifier)
  end
  
  def test_get_proxy_invalid
    proxy = Timezone.get_proxy('../Invalid/Identifier')
    assert_kind_of(TimezoneProxy, proxy)
    assert_equal('../Invalid/Identifier', proxy.identifier)
  end
  
  def test_get_tainted_loaded
    Timezone.get('Europe/Andorra')
  
    safe_test(:unavailable => :skip) do
      identifier = 'Europe/Andorra'.dup.taint
      assert(identifier.tainted?)
      tz = Timezone.get(identifier)
      assert_equal('Europe/Andorra', tz.identifier)
      assert(identifier.tainted?)
    end
  end
  
  def test_get_tainted_and_frozen_loaded
    Timezone.get('Europe/Andorra')
  
    safe_test do
      tz = Timezone.get('Europe/Andorra'.dup.taint.freeze)
      assert_equal('Europe/Andorra', tz.identifier)
    end
  end
  
  def test_get_tainted_not_previously_loaded
    skip_if_has_bug_14060

    safe_test(:unavailable => :skip) do
      identifier = 'Europe/Andorra'.dup.taint
      assert(identifier.tainted?)
      tz = Timezone.get(identifier)
      assert_equal('Europe/Andorra', tz.identifier)
      assert(identifier.tainted?)
    end
  end
  
  def test_get_tainted_and_frozen_not_previously_loaded
    skip_if_has_bug_14060

    safe_test do
      tz = Timezone.get('Europe/Amsterdam'.dup.taint.freeze)
      assert_equal('Europe/Amsterdam', tz.identifier)
    end
  end
  
  def test_new_no_args
    tz = Timezone.new
    
    assert_raises(UnknownTimezone) { tz.identifier }
    assert_raises(UnknownTimezone) { tz.friendly_identifier }
    assert_raises(UnknownTimezone) { tz.utc_to_local(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.local_to_utc(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.period_for_utc(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.periods_for_local(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.period_for_local(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.now }
    assert_raises(UnknownTimezone) { tz.current_period_and_time }
    assert_raises(UnknownTimezone) { tz.transitions_up_to(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.canonical_identifier }
    assert_raises(UnknownTimezone) { tz.canonical_zone }
  end
  
  def test_new_nil
    tz = Timezone.new(nil)
    
    assert_raises(UnknownTimezone) { tz.identifier }
    assert_raises(UnknownTimezone) { tz.friendly_identifier }
    assert_raises(UnknownTimezone) { tz.utc_to_local(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.local_to_utc(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.period_for_utc(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.periods_for_local(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.period_for_local(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.now }
    assert_raises(UnknownTimezone) { tz.current_period_and_time }
    assert_raises(UnknownTimezone) { tz.transitions_up_to(DateTime.new(2006,1,1,1,0,0)) }
    assert_raises(UnknownTimezone) { tz.canonical_identifier }
    assert_raises(UnknownTimezone) { tz.canonical_zone }
  end
  
  def test_new_arg
    tz = Timezone.new('Europe/London')
    assert_same(Timezone.get('Europe/London'), tz)    
  end
  
  def test_new_arg_not_exist    
    assert_raises(InvalidTimezoneIdentifier) { Timezone.new('Nowhere/Special') }
  end 
  
  def test_all
    all = Timezone.all
    expected = DataSource.get.timezone_identifiers.collect {|identifier| Timezone.get_proxy(identifier)}
    assert_equal(expected, all)
  end
  
  def test_all_identifiers
    all = Timezone.all_identifiers
    assert_equal(DataSource.get.timezone_identifiers, all)
  end
  
  def test_all_data_zones
    all_data = Timezone.all_data_zones
    expected = DataSource.get.data_timezone_identifiers.collect {|identifier| Timezone.get_proxy(identifier)}
    assert_equal(expected, all_data)
  end
  
  def test_all_data_zone_identifiers
    all_data = Timezone.all_data_zone_identifiers
    assert_equal(DataSource.get.data_timezone_identifiers, all_data)
  end
  
  def test_all_linked_zones
    all_linked = Timezone.all_linked_zones
    expected = DataSource.get.linked_timezone_identifiers.collect {|identifier| Timezone.get_proxy(identifier)}
    assert_equal(expected, all_linked)
  end
  
  def test_all_linked_zone_identifiers
    all_linked = Timezone.all_linked_zone_identifiers
    assert_equal(DataSource.get.linked_timezone_identifiers, all_linked)
  end
  
  def test_all_country_zones
    # Probably should relax this test - just need all the zones, don't care
    # about order.
    expected = Country.all.inject([]) {|result,country|
      result += country.zones
    }
    expected.uniq!
    
    all_country_zones = Timezone.all_country_zones
    assert_equal(expected, all_country_zones)
    
    all_country_zone_identifiers = Timezone.all_country_zone_identifiers
    assert_equal(all_country_zone_identifiers.length, all_country_zones.length)
    
    all_country_zones.each {|zone|
      assert_kind_of(TimezoneProxy, zone)
      assert(all_country_zone_identifiers.include?(zone.identifier))
    }            
  end
  
  def test_all_country_zone_identifiers
    # Probably should relax this test - just need all the zones, don't care
    # about order.
    expected = Country.all.inject([]) {|result,country|
      result += country.zone_identifiers
    }
    expected.uniq!
        
    assert_equal(expected, Timezone.all_country_zone_identifiers)
  end
  
  def test_us_zones   
    # Probably should relax this test - just need all the zones, don't care
    # about order.
    us_zones = Timezone.us_zones
    assert_equal(Country.get('US').zones.uniq, us_zones)
    
    us_zone_identifiers = Timezone.us_zone_identifiers
    assert_equal(us_zone_identifiers.length, us_zones.length)
    
    us_zones.each {|zone|
      assert_kind_of(TimezoneProxy, zone)
      assert(us_zone_identifiers.include?(zone.identifier))
    }
  end
  
  def test_us_zone_identifiers
    # Probably should relax this test - just need all the zones, don't care
    # about order.        
    assert_equal(Country.get('US').zone_identifiers.uniq, Timezone.us_zone_identifiers)
  end    
  
  def test_identifier
    assert_raises(UnknownTimezone) { Timezone.new.identifier }    
    assert_equal('Europe/Paris', TestTimezone.new('Europe/Paris').identifier)
  end
  
  def test_name
    assert_raises(UnknownTimezone) { Timezone.new.name }    
    assert_equal('Europe/Paris', TestTimezone.new('Europe/Paris').name)    
  end
  
  def test_friendly_identifier
    assert_equal('Paris', TestTimezone.new('Europe/Paris').friendly_identifier(true))
    assert_equal('Europe - Paris', TestTimezone.new('Europe/Paris').friendly_identifier(false))
    assert_equal('Europe - Paris', TestTimezone.new('Europe/Paris').friendly_identifier)
    assert_equal('Knox, Indiana', TestTimezone.new('America/Indiana/Knox').friendly_identifier(true))
    assert_equal('America - Knox, Indiana', TestTimezone.new('America/Indiana/Knox').friendly_identifier(false))
    assert_equal('America - Knox, Indiana', TestTimezone.new('America/Indiana/Knox').friendly_identifier)
    assert_equal('Dumont D\'Urville', TestTimezone.new('Antarctica/DumontDUrville').friendly_identifier(true))
    assert_equal('Antarctica - Dumont D\'Urville', TestTimezone.new('Antarctica/DumontDUrville').friendly_identifier(false))
    assert_equal('Antarctica - Dumont D\'Urville', TestTimezone.new('Antarctica/DumontDUrville').friendly_identifier)
    assert_equal('McMurdo', TestTimezone.new('Antarctica/McMurdo').friendly_identifier(true))
    assert_equal('Antarctica - McMurdo', TestTimezone.new('Antarctica/McMurdo').friendly_identifier(false))
    assert_equal('Antarctica - McMurdo', TestTimezone.new('Antarctica/McMurdo').friendly_identifier)
    assert_equal('GMT+1', TestTimezone.new('Etc/GMT+1').friendly_identifier(true))
    assert_equal('Etc - GMT+1', TestTimezone.new('Etc/GMT+1').friendly_identifier(false))
    assert_equal('Etc - GMT+1', TestTimezone.new('Etc/GMT+1').friendly_identifier)
    assert_equal('UTC', TestTimezone.new('UTC').friendly_identifier(true))
    assert_equal('UTC', TestTimezone.new('UTC').friendly_identifier(false))
    assert_equal('UTC', TestTimezone.new('UTC').friendly_identifier)
  end
  
  if defined?(Encoding)
    def test_friendly_identifier_non_binary_encoding
      refute_equal(Encoding::ASCII_8BIT, TestTimezone.new('Europe/Paris').friendly_identifier(true).encoding)
      refute_equal(Encoding::ASCII_8BIT, TestTimezone.new('Europe/Paris').friendly_identifier(false).encoding)
    end
  end

  def test_to_s
    assert_equal('Europe - Paris', TestTimezone.new('Europe/Paris').to_s)
    assert_equal('America - Knox, Indiana', TestTimezone.new('America/Indiana/Knox').to_s)
    assert_equal('Antarctica - Dumont D\'Urville', TestTimezone.new('Antarctica/DumontDUrville').to_s)
    assert_equal('Antarctica - McMurdo', TestTimezone.new('Antarctica/McMurdo').to_s)
    assert_equal('Etc - GMT+1', TestTimezone.new('Etc/GMT+1').to_s)
    assert_equal('UTC', TestTimezone.new('UTC').to_s)
  end    
    
  def test_period_for_local
    dt = DateTime.new(2005,2,18,16,24,23)
    dt2 = DateTime.new(2005,2,18,16,24,23).new_offset(Rational(5,24))
    dt3 = DateTime.new(2005,2,18,16,24,23 + Rational(789, 1000))
    t = Time.utc(2005,2,18,16,24,23)
    t2 = Time.local(2005,2,18,16,24,23)
    t3 = Time.utc(2005,2,18,16,24,23,789000)
    ts = t.to_i
    
    o1 = TimezoneOffset.new(0, 0, :GMT)
    o2 = TimezoneOffset.new(0, 3600, :BST)
        
    period = TimezonePeriod.new(
      TestTimezoneTransition.new(o1, o2, 1099184400),
      TestTimezoneTransition.new(o2, o1, 1111885200))
    
    dt_period = TestTimezone.new('Europe/London', nil, [period], dt).period_for_local(dt)
    dt2_period = TestTimezone.new('Europe/London', nil, [period], dt2).period_for_local(dt2)
    dt3_period = TestTimezone.new('Europe/London', nil, [period], dt3).period_for_local(dt3)
    t_period = TestTimezone.new('Europe/London', nil, [period], t).period_for_local(t)
    t2_period = TestTimezone.new('Europe/London', nil, [period], t2).period_for_local(t2)
    t3_period = TestTimezone.new('Europe/London', nil, [period], t3).period_for_local(t3)
    ts_period = TestTimezone.new('Europe/London', nil, [period], ts).period_for_local(ts)
    
    assert_equal(period, dt_period)
    assert_equal(period, dt2_period)
    assert_equal(period, dt3_period)
    assert_equal(period, t_period)
    assert_equal(period, t2_period)
    assert_equal(period, t3_period)
    assert_equal(period, ts_period)
  end
  
  def test_period_for_local_invalid
    dt = DateTime.new(2004,4,4,2,30,0)
    tz = TestTimezone.new('America/New_York', nil, [], dt)
    
    assert_raises(PeriodNotFound) do
      tz.period_for_local(dt)
    end
  end
  
  def test_period_for_local_ambiguous    
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,0,0)
    dt2 = DateTime.new(2004,10,31,1,0,Rational(555,1000))
    t = Time.utc(2004,10,31,1,30,0)
    t2 = Time.utc(2004,10,31,1,30,0,555000)
    i = Time.utc(2004,10,31,1,59,59).to_i
    
    dt_tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
    dt2_tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt2)
    t_tz = TestTimezone.new('America/New_York', nil, [p1, p2], t)
    t2_tz = TestTimezone.new('America/New_York', nil, [p1, p2], t2)
    i_tz = TestTimezone.new('America/New_York', nil, [p1, p2], i)
        
    assert_raises(AmbiguousTime) { dt_tz.period_for_local(dt) }
    assert_raises(AmbiguousTime) { dt2_tz.period_for_local(dt2) }
    assert_raises(AmbiguousTime) { t_tz.period_for_local(t) }
    assert_raises(AmbiguousTime) { t2_tz.period_for_local(t2) }
    assert_raises(AmbiguousTime) { i_tz.period_for_local(i) }
  end
  
  def test_period_for_local_not_found
    dt = DateTime.new(2004,4,4,2,0,0)
    dt2 = DateTime.new(2004,4,4,2,0,Rational(987,1000))
    t = Time.utc(2004,4,4,2,30,0)
    t2 = Time.utc(2004,4,4,2,30,0,987000)
    i = Time.utc(2004,4,4,2,59,59).to_i
    
    dt_tz = TestTimezone.new('America/New_York', nil, [], dt)
    dt2_tz = TestTimezone.new('America/New_York', nil, [], dt2)
    t_tz = TestTimezone.new('America/New_York', nil, [], t)
    t2_tz = TestTimezone.new('America/New_York', nil, [], t2)
    i_tz = TestTimezone.new('America/New_York', nil, [], i)    
        
    assert_raises(PeriodNotFound) { dt_tz.period_for_local(dt) }
    assert_raises(PeriodNotFound) { dt2_tz.period_for_local(dt2) }
    assert_raises(PeriodNotFound) { t_tz.period_for_local(t) }
    assert_raises(PeriodNotFound) { t2_tz.period_for_local(t2) }
    assert_raises(PeriodNotFound) { i_tz.period_for_local(i) }
  end
  
  def test_period_for_local_default_dst_set_true
    Timezone.default_dst = true
    
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)
    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
    
    assert_equal(p1, tz.period_for_local(dt))
    assert_equal(p1, tz.period_for_local(dt, true))
    assert_equal(p2, tz.period_for_local(dt, false))
    assert_raises(AmbiguousTime) { tz.period_for_local(dt, nil) }
  end
  
  def test_period_for_local_default_dst_set_false
    Timezone.default_dst = false
    
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)
    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
    
    assert_equal(p2, tz.period_for_local(dt))
    assert_equal(p1, tz.period_for_local(dt, true))
    assert_equal(p2, tz.period_for_local(dt, false))
    assert_raises(AmbiguousTime) { tz.period_for_local(dt, nil) }
  end
  
  def test_period_for_local_dst_flag_resolved
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)
    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)

    assert_equal(p1, tz.period_for_local(dt, true))
    assert_equal(p2, tz.period_for_local(dt, false))
    assert_equal(p1, tz.period_for_local(dt, true) {|periods| raise BlockCalled, 'should not be called' })
    assert_equal(p2, tz.period_for_local(dt, false) {|periods| raise BlockCalled, 'should not be called' })
  end
  
  def test_period_for_local_dst_block_called
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)
    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
    
    assert_raises(BlockCalled) {
      tz.period_for_local(dt) {|periods|        
        assert_equal([p1, p2], periods)
        
        # raise exception to test that the block was called
        raise BlockCalled, 'should be raised'
      }
    }
    
    assert_equal(p1, tz.period_for_local(dt) {|periods| periods.first})
    assert_equal(p2, tz.period_for_local(dt) {|periods| periods.last})
    assert_equal(p1, tz.period_for_local(dt) {|periods| [periods.first]})
    assert_equal(p2, tz.period_for_local(dt) {|periods| [periods.last]})
  end
  
  def test_period_for_local_dst_cannot_resolve
    # At midnight local time on Aug 5 1915 in Warsaw, the clocks were put back
    # 24 minutes and both periods were non-DST. Hence the block should be
    # called regardless of the value of the Boolean dst parameter.
    
    o0 = TimezoneOffset.new(5040, 0, :LMT)
    o1 = TimezoneOffset.new(5040, 0, :WMT)
    o2 = TimezoneOffset.new(3600, 0, :CET)
    o3 = TimezoneOffset.new(3600, 3600, :CEST)
    
    t1 = TestTimezoneTransition.new(o1, o0, DateTime.new(1879, 12, 31, 22, 36, 0))
    t2 = TestTimezoneTransition.new(o2, o1, DateTime.new(1915,  8,  4, 22, 36, 0))
    t3 = TestTimezoneTransition.new(o3, o2, DateTime.new(1916,  4, 30, 22,  0, 0))
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(1915,8,4,23,40,0)
    
    tz = TestTimezone.new('Europe/Warsaw', nil, [p1, p2], dt)
        
    assert_raises(BlockCalled) {
      tz.period_for_local(dt, true) {|periods|
        assert_equal([p1, p2], periods)        
        raise BlockCalled, 'should be raised'
      }
    }
    
    assert_raises(BlockCalled) {
      tz.period_for_local(dt, false) {|periods|
        assert_equal([p1, p2], periods)
        raise BlockCalled, 'should be raised'
      }
    }    
  end
  
  def test_period_for_local_block_ambiguous
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)
    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
        
    assert_raises(AmbiguousTime) do
      tz.period_for_local(dt) {|periods| nil}
    end
    
    assert_raises(AmbiguousTime) do
      tz.period_for_local(dt) {|periods| periods}
    end
    
    assert_raises(AmbiguousTime) do
      tz.period_for_local(dt) {|periods| []}
    end
    
    assert_raises(AmbiguousTime) do
      tz.period_for_local(dt) {|periods| raise AmbiguousTime, 'Ambiguous time'}
    end
  end
   
  def test_utc_to_local
    dt = DateTime.new(2005,6,18,16,24,23)
    dt2 = DateTime.new(2005,6,18,16,24,23).new_offset(Rational(5,24))
    dtu = DateTime.new(2005,6,18,16,24,23 + Rational(567,1000))
    dtu2 = DateTime.new(2005,6,18,16,24,23 + Rational(567,1000)).new_offset(Rational(5,24))
    t = Time.utc(2005,6,18,16,24,23)
    t2 = Time.local(2005,6,18,16,24,23)
    tu = Time.utc(2005,6,18,16,24,23,567000)
    tu2 = Time.local(2005,6,18,16,24,23,567000)
    ts = t.to_i
    
    o1 = TimezoneOffset.new(0, 0, :GMT)
    o2 = TimezoneOffset.new(0, 3600, :BST)
        
    period = TimezonePeriod.new(
      TestTimezoneTransition.new(o2, o1, 1111885200),
      TestTimezoneTransition.new(o1, o2, 1130634000))
        
    assert_equal(DateTime.new(2005,6,18,17,24,23), TestTimezone.new('Europe/London', period, [], dt).utc_to_local(dt))
    assert_equal(DateTime.new(2005,6,18,17,24,23), TestTimezone.new('Europe/London', period, [], dt2).utc_to_local(dt2))
    assert_equal(DateTime.new(2005,6,18,17,24,23 + Rational(567,1000)), TestTimezone.new('Europe/London', period, [], dtu).utc_to_local(dtu))
    assert_equal(DateTime.new(2005,6,18,17,24,23 + Rational(567,1000)), TestTimezone.new('Europe/London', period, [], dtu2).utc_to_local(dtu2))
    assert_equal(Time.utc(2005,6,18,17,24,23), TestTimezone.new('Europe/London', period, [], t).utc_to_local(t))
    assert_equal(Time.utc(2005,6,18,17,24,23), TestTimezone.new('Europe/London', period, [], t2).utc_to_local(t2))
    assert_equal(Time.utc(2005,6,18,17,24,23,567000), TestTimezone.new('Europe/London', period, [], tu).utc_to_local(tu))
    assert_equal(Time.utc(2005,6,18,17,24,23,567000), TestTimezone.new('Europe/London', period, [], tu2).utc_to_local(tu2))
    assert_equal(Time.utc(2005,6,18,17,24,23).to_i, TestTimezone.new('Europe/London', period, [], ts).utc_to_local(ts))
  end
  
  def test_utc_to_local_offset
    dt = DateTime.new(2005,6,18,16,24,23)
    dt2 = DateTime.new(2005,6,18,16,24,23).new_offset(Rational(5,24))
    dtu = DateTime.new(2005,6,18,16,24,23 + Rational(567,1000))
    dtu2 = DateTime.new(2005,6,18,16,24,23 + Rational(567,1000)).new_offset(Rational(5,24))
    t = Time.utc(2005,6,18,16,24,23)
    t2 = Time.local(2005,6,18,16,24,23)
    tu = Time.utc(2005,6,18,16,24,23,567000)
    tu2 = Time.local(2005,6,18,16,24,23,567000)
    
    o1 = TimezoneOffset.new(0, 0, :GMT)
    o2 = TimezoneOffset.new(0, 3600, :BST)
        
    period = TimezonePeriod.new(
      TestTimezoneTransition.new(o2, o1, 1111885200),
      TestTimezoneTransition.new(o1, o2, 1130634000))
    
    assert_equal(0, TestTimezone.new('Europe/London', period, [], dt).utc_to_local(dt).offset)
    assert_equal(0, TestTimezone.new('Europe/London', period, [], dt2).utc_to_local(dt2).offset)
    assert_equal(0, TestTimezone.new('Europe/London', period, [], dtu).utc_to_local(dtu).offset)
    assert_equal(0, TestTimezone.new('Europe/London', period, [], dtu2).utc_to_local(dtu2).offset)    
    assert_equal(0, TestTimezone.new('Europe/London', period, [], t).utc_to_local(t).utc_offset)
    assert(TestTimezone.new('Europe/London', period, [], t).utc_to_local(t).utc?)
    assert_equal(0, TestTimezone.new('Europe/London', period, [], t2).utc_to_local(t2).utc_offset)
    assert(TestTimezone.new('Europe/London', period, [], t2).utc_to_local(t2).utc?)
    assert_equal(0, TestTimezone.new('Europe/London', period, [], tu).utc_to_local(tu).utc_offset)
    assert(TestTimezone.new('Europe/London', period, [], tu).utc_to_local(tu).utc?)
    assert_equal(0, TestTimezone.new('Europe/London', period, [], tu2).utc_to_local(tu2).utc_offset)
    assert(TestTimezone.new('Europe/London', period, [], tu2).utc_to_local(tu2).utc?)
  end
  
  def test_local_to_utc
    dt = DateTime.new(2005,6,18,16,24,23)
    dt2 = DateTime.new(2005,6,18,16,24,23).new_offset(Rational(5, 24))
    dtu = DateTime.new(2005,6,18,16,24,23 + Rational(567,1000))
    dtu2 = DateTime.new(2005,6,18,16,24,23 + Rational(567,1000)).new_offset(Rational(5, 24))
    t = Time.utc(2005,6,18,16,24,23)
    t2 = Time.local(2005,6,18,16,24,23)
    tu = Time.utc(2005,6,18,16,24,23,567000)
    tu2 = Time.local(2005,6,18,16,24,23,567000)
    ts = t.to_i
        
    o1 = TimezoneOffset.new(0, 0, :GMT)
    o2 = TimezoneOffset.new(0, 3600, :BST)
        
    period = TimezonePeriod.new(
      TestTimezoneTransition.new(o2, o1, 1111885200),
      TestTimezoneTransition.new(o1, o2, 1130634000))
    
    assert_equal(DateTime.new(2005,6,18,15,24,23), TestTimezone.new('Europe/London', nil, [period], dt).local_to_utc(dt))
    assert_equal(DateTime.new(2005,6,18,15,24,23), TestTimezone.new('Europe/London', nil, [period], dt2).local_to_utc(dt2))
    assert_equal(DateTime.new(2005,6,18,15,24,23 + Rational(567,1000)), TestTimezone.new('Europe/London', nil, [period], dtu).local_to_utc(dtu))
    assert_equal(DateTime.new(2005,6,18,15,24,23 + Rational(567,1000)), TestTimezone.new('Europe/London', nil, [period], dtu2).local_to_utc(dtu2))
    assert_equal(Time.utc(2005,6,18,15,24,23), TestTimezone.new('Europe/London', nil, [period], t).local_to_utc(t))
    assert_equal(Time.utc(2005,6,18,15,24,23), TestTimezone.new('Europe/London', nil, [period], t2).local_to_utc(t2))
    assert_equal(Time.utc(2005,6,18,15,24,23,567000), TestTimezone.new('Europe/London', nil, [period], tu).local_to_utc(tu))
    assert_equal(Time.utc(2005,6,18,15,24,23,567000), TestTimezone.new('Europe/London', nil, [period], tu2).local_to_utc(tu2))
    assert_equal(Time.utc(2005,6,18,15,24,23).to_i, TestTimezone.new('Europe/London', nil, [period], ts).local_to_utc(ts))
  end
  
  def test_local_to_utc_offset
    dt = DateTime.new(2005,6,18,16,24,23)
    dt2 = DateTime.new(2005,6,18,16,24,23).new_offset(Rational(5, 24))
    dtu = DateTime.new(2005,6,18,16,24,23 + Rational(567,1000))
    dtu2 = DateTime.new(2005,6,18,16,24,23 + Rational(567,1000)).new_offset(Rational(5, 24))
    t = Time.utc(2005,6,18,16,24,23)
    t2 = Time.local(2005,6,18,16,24,23)
    tu = Time.utc(2005,6,18,16,24,23,567000)
    tu2 = Time.local(2005,6,18,16,24,23,567000)
    
    o1 = TimezoneOffset.new(0, 0, :GMT)
    o2 = TimezoneOffset.new(0, 3600, :BST)
        
    period = TimezonePeriod.new(
      TestTimezoneTransition.new(o2, o1, 1111885200),
      TestTimezoneTransition.new(o1, o2, 1130634000))
    
    assert_equal(0, TestTimezone.new('Europe/London', nil, [period], dt).local_to_utc(dt).offset)
    assert_equal(0, TestTimezone.new('Europe/London', nil, [period], dt2).local_to_utc(dt2).offset)
    assert_equal(0, TestTimezone.new('Europe/London', nil, [period], dtu).local_to_utc(dtu).offset)
    assert_equal(0, TestTimezone.new('Europe/London', nil, [period], dtu2).local_to_utc(dtu2).offset)
    assert_equal(0, TestTimezone.new('Europe/London', nil, [period], t).local_to_utc(t).utc_offset)
    assert(TestTimezone.new('Europe/London', nil, [period], t).local_to_utc(t).utc?)
    assert_equal(0, TestTimezone.new('Europe/London', nil, [period], t2).local_to_utc(t2).utc_offset)
    assert(TestTimezone.new('Europe/London', nil, [period], t2).local_to_utc(t2).utc?)
    assert_equal(0, TestTimezone.new('Europe/London', nil, [period], tu).local_to_utc(tu).utc_offset)
    assert(TestTimezone.new('Europe/London', nil, [period], tu).local_to_utc(tu).utc?)
    assert_equal(0, TestTimezone.new('Europe/London', nil, [period], tu2).local_to_utc(tu2).utc_offset)
    assert(TestTimezone.new('Europe/London', nil, [period], tu2).local_to_utc(tu2).utc?)
  end
  
  def test_local_to_utc_utc_local_returns_utc
    # Check that UTC time instances are always returned even if the system
    # is using UTC as the time zone.
    
    # Note that this will only test will only work correctly on platforms where
    # setting the TZ environment variable has an effect. If setting TZ has no
    # effect, then this test will still pass.
    
    old_tz = ENV['TZ']
    begin
      ENV['TZ'] = 'UTC'
      
      tz = Timezone.get('America/New_York')
      
      t = tz.local_to_utc(Time.local(2014, 1, 11, 17, 18, 41))
      assert_equal(Time.utc(2014, 1, 11, 22, 18, 41), t)      
      assert(t.utc?)
    ensure
      ENV['TZ'] = old_tz
    end
  end
  
  def test_local_to_utc_invalid
    dt = DateTime.new(2004,4,4,2,30,0)
    tz = TestTimezone.new('America/New_York', nil, [], dt)        
    assert_raises(PeriodNotFound) { tz.local_to_utc(dt) }
    
    t = Time.utc(2004,4,4,2,30,0)
    tz = TestTimezone.new('America/New_York', nil, [], t)        
    assert_raises(PeriodNotFound) { tz.local_to_utc(t) }
    
    i = Time.utc(2004,4,4,2,30,0).to_i
    tz = TestTimezone.new('America/New_York', nil, [], i)        
    assert_raises(PeriodNotFound) { tz.local_to_utc(i) }    
  end
  
  def test_local_to_utc_ambiguous
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
    assert_raises(AmbiguousTime) { tz.local_to_utc(dt) }
    
    t = Time.utc(2004,10,31,1,30,0)
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], t)
    assert_raises(AmbiguousTime) { tz.local_to_utc(t) }

    i = Time.utc(2004,10,31,1,30,0).to_i
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], i)
    assert_raises(AmbiguousTime) { tz.local_to_utc(i) }
    
    f = Time.utc(2004,10,31,1,30,0,501).to_i
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], f)
    assert_raises(AmbiguousTime) { tz.local_to_utc(f) }  
  end
  
  def test_local_to_utc_not_found
    dt = DateTime.new(2004,4,4,2,0,0)
    t = Time.utc(2004,4,4,2,30,0)
    i = Time.utc(2004,4,4,2,59,59).to_i
    
    dt_tz = TestTimezone.new('America/New_York', nil, [], dt)
    t_tz = TestTimezone.new('America/New_York', nil, [], t)
    i_tz = TestTimezone.new('America/New_York', nil, [], i)
        
    assert_raises(PeriodNotFound) { dt_tz.local_to_utc(dt) }
    assert_raises(PeriodNotFound) { t_tz.local_to_utc(t) }
    assert_raises(PeriodNotFound) { i_tz.local_to_utc(i) }
  end
  
  def test_local_to_utc_default_dst_set_true
    Timezone.default_dst = true
  
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
    
    assert_equal(DateTime.new(2004,10,31,5,30,0), tz.local_to_utc(dt))    
    assert_equal(DateTime.new(2004,10,31,5,30,0), tz.local_to_utc(dt, true))
    assert_equal(DateTime.new(2004,10,31,6,30,0), tz.local_to_utc(dt, false))
    assert_raises(AmbiguousTime) { tz.local_to_utc(dt, nil) }
    assert_equal(DateTime.new(2004,10,31,5,30,0), tz.local_to_utc(dt) {|periods| raise BlockCalled, 'should not be called' })
  end
  
  def test_local_to_utc_default_dst_set_false
    Timezone.default_dst = false
  
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
        
    assert_equal(DateTime.new(2004,10,31,6,30,0), tz.local_to_utc(dt))
    assert_equal(DateTime.new(2004,10,31,6,30,0), tz.local_to_utc(dt, false))
    assert_equal(DateTime.new(2004,10,31,5,30,0), tz.local_to_utc(dt, true))
    assert_raises(AmbiguousTime) { tz.local_to_utc(dt, nil) }
    assert_equal(DateTime.new(2004,10,31,6,30,0), tz.local_to_utc(dt) {|periods| raise BlockCalled, 'should not be called' })
  end
  
  def test_local_to_utc_dst_flag_resolved
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
        
    assert_equal(DateTime.new(2004,10,31,5,30,0), tz.local_to_utc(dt, true))
    assert_equal(DateTime.new(2004,10,31,6,30,0), tz.local_to_utc(dt, false))
    assert_equal(DateTime.new(2004,10,31,5,30,0), tz.local_to_utc(dt, true) {|periods| raise BlockCalled, 'should not be called' })
    assert_equal(DateTime.new(2004,10,31,6,30,0), tz.local_to_utc(dt, false) {|periods| raise BlockCalled, 'should not be called' })
  end
  
  def test_local_to_utc_dst_block_called
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
    
    assert_raises(BlockCalled) {
      tz.local_to_utc(dt) {|periods|
        assert_equal([p1, p2], periods)                
        
        # raise exception to test that the block was called
        raise BlockCalled, 'should be raised'
      }
    }
    
    assert_equal(DateTime.new(2004,10,31,5,30,0), tz.local_to_utc(dt) {|periods| periods.first})
    assert_equal(DateTime.new(2004,10,31,6,30,0), tz.local_to_utc(dt) {|periods| periods.last})
    assert_equal(DateTime.new(2004,10,31,5,30,0), tz.local_to_utc(dt) {|periods| [periods.first]})
    assert_equal(DateTime.new(2004,10,31,6,30,0), tz.local_to_utc(dt) {|periods| [periods.last]})
  end
  
  def test_local_to_utc_dst_cannot_resolve
    # At midnight local time on Aug 5 1915 in Warsaw, the clocks were put back
    # 24 minutes and both periods were non-DST. Hence the block should be
    # called regardless of the value of the Boolean dst parameter.

    o0 = TimezoneOffset.new(5040, 0, :LMT)
    o1 = TimezoneOffset.new(5040, 0, :WMT)
    o2 = TimezoneOffset.new(3600, 0, :CET)
    o3 = TimezoneOffset.new(3600, 3600, :CEST)
    
    t1 = TestTimezoneTransition.new(o1, o0, DateTime.new(1879, 12, 31, 22, 36, 0))
    t2 = TestTimezoneTransition.new(o2, o1, DateTime.new(1915,  8,  4, 22, 36, 0))
    t3 = TestTimezoneTransition.new(o3, o2, DateTime.new(1916,  4, 30, 22,  0, 0))
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(1915,8,4,23,40,0)
    
    tz = TestTimezone.new('Europe/Warsaw', nil, [p1, p2], dt)
        
    assert_raises(BlockCalled) do
      tz.local_to_utc(dt, true) do |periods|
        assert_equal([p1, p2], periods)        
        raise BlockCalled, 'should be raised'
      end
    end
    
    assert_raises(BlockCalled) do
      tz.local_to_utc(dt, false) do |periods|
        assert_equal([p1, p2], periods)        
        raise BlockCalled, 'should be raised'
      end
    end
    
    assert_equal(DateTime.new(1915,8,4,22,16,0), tz.local_to_utc(dt) {|periods| periods.first})
    assert_equal(DateTime.new(1915,8,4,22,40,0), tz.local_to_utc(dt) {|periods| periods.last})
    assert_equal(DateTime.new(1915,8,4,22,16,0), tz.local_to_utc(dt) {|periods| [periods.first]})
    assert_equal(DateTime.new(1915,8,4,22,40,0), tz.local_to_utc(dt) {|periods| [periods.last]})
  end
  
  def test_local_to_utc_block_ambiguous    
    o1 = TimezoneOffset.new(-18000, 0, :EST)
    o2 = TimezoneOffset.new(-18000, 3600, :EDT)
    
    t1 = TestTimezoneTransition.new(o2, o1, 1081062000)
    t2 = TestTimezoneTransition.new(o1, o2, 1099202400)
    t3 = TestTimezoneTransition.new(o2, o1, 1112511600)
    
    p1 = TimezonePeriod.new(t1, t2)
    p2 = TimezonePeriod.new(t2, t3)
    
    dt = DateTime.new(2004,10,31,1,30,0)    
    tz = TestTimezone.new('America/New_York', nil, [p1, p2], dt)
    
    assert_raises(AmbiguousTime) { tz.local_to_utc(dt) {|periods| nil} }    
    assert_raises(AmbiguousTime) { tz.local_to_utc(dt) {|periods| periods} }     
    assert_raises(AmbiguousTime) { tz.local_to_utc(dt) {|periods| []} }    
    assert_raises(AmbiguousTime) { tz.local_to_utc(dt) {|periods| raise AmbiguousTime, 'Ambiguous time'} }
  end
  
  def test_offsets_up_to
    o1 = TimezoneOffset.new(-17900, 0,    :TESTLMT)
    o2 = TimezoneOffset.new(-18000, 3600, :TESTD)
    o3 = TimezoneOffset.new(-18000, 0,    :TESTS)
    o4 = TimezoneOffset.new(-21600, 3600, :TESTD)
    o5 = TimezoneOffset.new(-21600, 0,    :TESTS)
    
    t1 = TestTimezoneTransition.new(o2, o1, Time.utc(2010, 4,1,1,0,0).to_i)
    t2 = TestTimezoneTransition.new(o3, o2, Time.utc(2010,10,1,1,0,0).to_i)
    t3 = TestTimezoneTransition.new(o2, o3, Time.utc(2011, 3,1,1,0,0).to_i)
    t4 = TestTimezoneTransition.new(o4, o2, Time.utc(2011, 4,1,1,0,0).to_i)
    t5 = TestTimezoneTransition.new(o3, o4, Time.utc(2011,10,1,1,0,0).to_i)
    t6 = TestTimezoneTransition.new(o5, o3, Time.utc(2012, 3,1,1,0,0).to_i)
    
    assert_array_same_items([o1, o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,1), nil, [t1, t2, t3, t4, t5, t6]).
      offsets_up_to(Time.utc(2012,3,1,1,0,1)))
    assert_array_same_items([o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,1), Time.utc(2010,4,1,1,0,0), [t1, t2, t3, t4, t5, t6]).
      offsets_up_to(Time.utc(2012,3,1,1,0,1), Time.utc(2010,4,1,1,0,0)))
    assert_array_same_items([o1, o2, o3, o4], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,0), nil, [t1, t2, t3, t4, t5]).
      offsets_up_to(Time.utc(2012,3,1,1,0,0)))
    assert_array_same_items([o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,1), Time.utc(2010,4,1,1,0,1), [t2, t3, t4, t5, t6]).
      offsets_up_to(Time.utc(2012,3,1,1,0,1), Time.utc(2010,4,1,1,0,1)))
    assert_array_same_items([o2, o3], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2011,3,1,2,0,0), Time.utc(2011,3,1,0,0,0), [t3]).
      offsets_up_to(Time.utc(2011,3,1,2,0,0), Time.utc(2011,3,1,0,0,0)))
    assert_array_same_items([o3, o4], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,0), Time.utc(2011,4,1,1,0,0), [t4, t5]).
      offsets_up_to(Time.utc(2012,3,1,1,0,0), Time.utc(2011,4,1,1,0,0)))

    assert_array_same_items([o1, o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,1).to_i, nil, [t1, t2, t3, t4, t5, t6]).
      offsets_up_to(Time.utc(2012,3,1,1,0,1).to_i))
    assert_array_same_items([o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,1).to_i, Time.utc(2010,4,1,1,0,0).to_i, [t1, t2, t3, t4, t5, t6]).
      offsets_up_to(Time.utc(2012,3,1,1,0,1).to_i, Time.utc(2010,4,1,1,0,0).to_i))
    assert_array_same_items([o1, o2, o3, o4], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,0).to_i, nil, [t1, t2, t3, t4, t5]).
      offsets_up_to(Time.utc(2012,3,1,1,0,0).to_i))
    assert_array_same_items([o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,1).to_i, Time.utc(2010,4,1,1,0,1).to_i, [t2, t3, t4, t5, t6]).
      offsets_up_to(Time.utc(2012,3,1,1,0,1).to_i, Time.utc(2010,4,1,1,0,1).to_i))
    assert_array_same_items([o2, o3], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2011,3,1,2,0,0).to_i, Time.utc(2011,3,1,0,0,0).to_i, [t3]).
      offsets_up_to(Time.utc(2011,3,1,2,0,0).to_i, Time.utc(2011,3,1,0,0,0).to_i))
    assert_array_same_items([o3, o4], 
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,3,1,1,0,0).to_i, Time.utc(2011,4,1,1,0,0).to_i, [t4, t5]).
      offsets_up_to(Time.utc(2012,3,1,1,0,0).to_i, Time.utc(2011,4,1,1,0,0).to_i))
      
    assert_array_same_items([o1, o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', DateTime.new(2012,3,1,1,0,1), nil, [t1, t2, t3, t4, t5, t6]).
      offsets_up_to(DateTime.new(2012,3,1,1,0,1)))
    assert_array_same_items([o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', DateTime.new(2012,3,1,1,0,1), DateTime.new(2010,4,1,1,0,0), [t1, t2, t3, t4, t5, t6]).
      offsets_up_to(DateTime.new(2012,3,1,1,0,1), DateTime.new(2010,4,1,1,0,0)))
    assert_array_same_items([o1, o2, o3, o4], 
      OffsetsUpToTestTimezone.new('Test/Zone', DateTime.new(2012,3,1,1,0,0), nil, [t1, t2, t3, t4, t5]).
      offsets_up_to(DateTime.new(2012,3,1,1,0,0)))
    assert_array_same_items([o2, o3, o4, o5], 
      OffsetsUpToTestTimezone.new('Test/Zone', DateTime.new(2012,3,1,1,0,1), DateTime.new(2010,4,1,1,0,1), [t2, t3, t4, t5, t6]).
      offsets_up_to(DateTime.new(2012,3,1,1,0,1), DateTime.new(2010,4,1,1,0,1)))
    assert_array_same_items([o2, o3], 
      OffsetsUpToTestTimezone.new('Test/Zone', DateTime.new(2011,3,1,2,0,0), DateTime.new(2011,3,1,0,0,0), [t3]).
      offsets_up_to(DateTime.new(2011,3,1,2,0,0), DateTime.new(2011,3,1,0,0,0)))
    assert_array_same_items([o3, o4], 
      OffsetsUpToTestTimezone.new('Test/Zone', DateTime.new(2012,3,1,1,0,0), DateTime.new(2011,4,1,1,0,0), [t4, t5]).
      offsets_up_to(DateTime.new(2012,3,1,1,0,0), DateTime.new(2011,4,1,1,0,0)))
  end
  
  def test_offsets_up_to_no_transitions
    o = TimezoneOffset.new(600, 0, :LMT)
    p = TimezonePeriod.new(nil, nil, o)
        
    assert_array_same_items([o],
      OffsetsUpToNoTransitionsTestTimezone.new('Test/Zone', Time.utc(2000,1,1,1,0,0), nil, p).
      offsets_up_to(Time.utc(2000,1,1,1,0,0)))
    assert_array_same_items([o],
      OffsetsUpToNoTransitionsTestTimezone.new('Test/Zone', Time.utc(2000,1,1,1,0,0), Time.utc(1990,1,1,1,0,0), p).
      offsets_up_to(Time.utc(2000,1,1,1,0,0), Time.utc(1990,1,1,1,0,0)))
      
    assert_array_same_items([o],
      OffsetsUpToNoTransitionsTestTimezone.new('Test/Zone', Time.utc(2000,1,1,1,0,0).to_i, nil, p).
      offsets_up_to(Time.utc(2000,1,1,1,0,0).to_i))
    assert_array_same_items([o],
      OffsetsUpToNoTransitionsTestTimezone.new('Test/Zone', Time.utc(2000,1,1,1,0,0).to_i, Time.utc(1990,1,1,1,0,0).to_i, p).
      offsets_up_to(Time.utc(2000,1,1,1,0,0).to_i, Time.utc(1990,1,1,1,0,0).to_i))
      
    assert_array_same_items([o],
      OffsetsUpToNoTransitionsTestTimezone.new('Test/Zone', DateTime.new(2000,1,1,1,0,0), nil, p).
      offsets_up_to(DateTime.new(2000,1,1,1,0,0)))
    assert_array_same_items([o],
      OffsetsUpToNoTransitionsTestTimezone.new('Test/Zone', DateTime.new(2000,1,1,1,0,0), DateTime.new(1990,1,1,1,0,0), p).
      offsets_up_to(DateTime.new(2000,1,1,1,0,0), DateTime.new(1990,1,1,1,0,0)))
  end
  
  def test_offsets_up_to_utc_to_not_greater_than_utc_from
    assert_raises(ArgumentError) do
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,8,1,0,0,0), Time.utc(2012,8,1,0,0,0), []).
        offsets_up_to(Time.utc(2012,8,1,0,0,0), Time.utc(2012,8,1,0,0,0))
    end
    
    assert_raises(ArgumentError) do
      OffsetsUpToTestTimezone.new('Test/Zone', Time.utc(2012,8,1,0,0,0).to_i, Time.utc(2012,8,1,0,0,0).to_i, []).
        offsets_up_to(Time.utc(2012,8,1,0,0,0).to_i, Time.utc(2012,8,1,0,0,0).to_i)
    end
    
    assert_raises(ArgumentError) do
      OffsetsUpToTestTimezone.new('Test/Zone', DateTime.new(2012,8,1,0,0,0), DateTime.new(2012,8,1,0,0,0), []).
        offsets_up_to(DateTime.new(2012,8,1,0,0,0), DateTime.new(2012,8,1,0,0,0))
    end
  end
  
  def test_now
    assert_kind_of(Time, Timezone.get('Europe/London').now)
  end
  
  def test_current_period
    assert_kind_of(TimezonePeriod, Timezone.get('Europe/London').current_period)
  end
  
  def test_current_period_and_time
    current = Timezone.get('Europe/London').current_period_and_time
    assert_equal(2, current.length)
    assert_kind_of(Time, current[0])
    assert_kind_of(TimezonePeriod, current[1])
  end
  
  def test_current_time_and_period
    current = Timezone.get('Europe/London').current_time_and_period
    assert_equal(2, current.length)
    assert_kind_of(Time, current[0])
    assert_kind_of(TimezonePeriod, current[1])
  end
    
  def test_compare
    assert_equal(0, TestTimezone.new('Europe/London') <=> TestTimezone.new('Europe/London'))
    assert_equal(-1, TestTimezone.new('Europe/London') <=> TestTimezone.new('Europe/london'))
    assert_equal(-1, TestTimezone.new('Europe/London') <=> TestTimezone.new('Europe/Paris'))
    assert_equal(1, TestTimezone.new('Europe/Paris') <=> TestTimezone.new('Europe/London'))
    assert_equal(-1, TestTimezone.new('America/New_York') <=> TestTimezone.new('Europe/Paris'))
    assert_equal(1, TestTimezone.new('Europe/Paris') <=> TestTimezone.new('America/New_York'))    
  end
  
  def test_compare_non_comparable
    assert_nil(TestTimezone.new('Europe/London') <=> Object.new)
  end
  
  def test_equality
    assert_equal(true, TestTimezone.new('Europe/London') == TestTimezone.new('Europe/London'))
    assert_equal(false, TestTimezone.new('Europe/London') == TestTimezone.new('Europe/london'))
    assert_equal(false, TestTimezone.new('Europe/London') == TestTimezone.new('Europe/Paris'))
    assert(!(TestTimezone.new('Europe/London') == Object.new))
  end
  
  def test_eql
    assert_equal(true, TestTimezone.new('Europe/London').eql?(TestTimezone.new('Europe/London')))
    assert_equal(false, TestTimezone.new('Europe/London').eql?(TestTimezone.new('Europe/london')))
    assert_equal(false, TestTimezone.new('Europe/London').eql?(TestTimezone.new('Europe/Paris')))
    assert(!TestTimezone.new('Europe/London').eql?(Object.new))
  end
  
  def test_hash
    assert_equal('Europe/London'.hash, TestTimezone.new('Europe/London').hash)
    assert_equal('America/New_York'.hash, TestTimezone.new('America/New_York').hash)
  end
  
  def test_marshal_data
    tz = Timezone.get('Europe/London')
    assert_kind_of(DataTimezone, tz)
    assert_same(tz, Marshal.load(Marshal.dump(tz)))    
  end
  
  def test_marshal_linked
    tz = Timezone.get('UTC')
    
    # ZoneinfoDataSource doesn't return LinkedTimezoneInfo for any timezone.
    if DataSource.get.load_timezone_info('UTC').kind_of?(LinkedTimezoneInfo)
      assert_kind_of(LinkedTimezone, tz)
    else
      assert_kind_of(DataTimezone, tz)
    end
    
    assert_same(tz, Marshal.load(Marshal.dump(tz)))    
  end
  
  def test_strftime_datetime
    tz = Timezone.get('Europe/London')
    dt = DateTime.new(2006, 7, 15, 22, 12, 2)
    assert_equal('23:12:02 BST', tz.strftime('%H:%M:%S %Z', dt))
    assert_equal('BST', tz.strftime('%Z', dt))
    assert_equal('%ZBST', tz.strftime('%%Z%Z', dt))
    assert_equal('BST BST', tz.strftime('%Z %Z', dt))
    assert_equal('BST %Z %BST %%Z %%BST', tz.strftime('%Z %%Z %%%Z %%%%Z %%%%%Z', dt))
    assert_equal('+0100 +01:00 +01:00:00 +01 %::::z', tz.strftime('%z %:z %::z %:::z %::::z', dt))
    assert_equal('1153001522 %s %1153001522', tz.strftime('%s %%s %%%s', dt))
  end
  
  def test_strftime_time
    tz = Timezone.get('Europe/London')
    t = Time.utc(2006, 7, 15, 22, 12, 2)
    assert_equal('23:12:02 BST', tz.strftime('%H:%M:%S %Z', t))
    assert_equal('BST', tz.strftime('%Z', t))
    assert_equal('%ZBST', tz.strftime('%%Z%Z', t))
    assert_equal('BST BST', tz.strftime('%Z %Z', t))
    assert_equal('BST %Z %BST %%Z %%BST', tz.strftime('%Z %%Z %%%Z %%%%Z %%%%%Z', t))
    assert_equal('+0100 +01:00 +01:00:00 +01 %::::z', tz.strftime('%z %:z %::z %:::z %::::z', t))
    assert_equal('1153001522 %s %1153001522', tz.strftime('%s %%s %%%s', t))
  end
  
  def test_strftime_int
    tz = Timezone.get('Europe/London')
    i = Time.utc(2006, 7, 15, 22, 12, 2).to_i
    assert_equal('23:12:02 BST', tz.strftime('%H:%M:%S %Z', i))
    assert_equal('BST', tz.strftime('%Z', i))
    assert_equal('%ZBST', tz.strftime('%%Z%Z', i))
    assert_equal('BST BST', tz.strftime('%Z %Z', i))
    assert_equal('BST %Z %BST %%Z %%BST', tz.strftime('%Z %%Z %%%Z %%%%Z %%%%%Z', i))
    assert_equal('+0100 +01:00 +01:00:00 +01 %::::z', tz.strftime('%z %:z %::z %:::z %::::z', i))
    assert_equal('1153001522 %s %1153001522', tz.strftime('%s %%s %%%s', i))
  end
  
  def test_get_missing_data_source
    DataSource.set(DataSource.new)
    
    assert_raises(InvalidDataSource) do
      Timezone.get('Europe/London')
    end
  end
  
  def test_new_missing_data_source
    DataSource.set(DataSource.new)
    
    assert_raises(InvalidDataSource) do
      Timezone.new('Europe/London')
    end
  end
  
  def test_all_missing_data_source
    DataSource.set(DataSource.new)
    
    assert_raises(InvalidDataSource) do
      Timezone.all
    end
  end
  
  def test_all_identifiers_missing_data_source
    DataSource.set(DataSource.new)
    
    assert_raises(InvalidDataSource) do
      Timezone.all_identifiers
    end
  end
  
  def test_all_data_zones_missing_data_source
    DataSource.set(DataSource.new)
    
    assert_raises(InvalidDataSource) do
      Timezone.all_data_zones
    end
  end
  
  def test_all_data_zone_identifiers_missing_data_source
    DataSource.set(DataSource.new)
    
    assert_raises(InvalidDataSource) do
      Timezone.all_data_zone_identifiers
    end
  end

  def test_all_linked_zones_missing_data_source
    DataSource.set(DataSource.new)
    
    assert_raises(InvalidDataSource) do
      Timezone.all_linked_zones
    end
  end

  def test_all_linked_zone_identifiers_missing_data_source
    DataSource.set(DataSource.new)
    
    assert_raises(InvalidDataSource) do
      Timezone.all_linked_zone_identifiers
    end
  end  
end
