aboutsummaryrefslogtreecommitdiffstats
path: root/activesupport/test/multibyte_chars_test.rb
blob: b0027047dfd2557847271c7343015f31bbc48e1b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
# frozen_string_literal: true

require "abstract_unit"
require "multibyte_test_helpers"
require "active_support/core_ext/string/multibyte"

class MultibyteCharsTest < ActiveSupport::TestCase
  include MultibyteTestHelpers

  def setup
    @proxy_class = ActiveSupport::Multibyte::Chars
    @chars = @proxy_class.new UNICODE_STRING.dup
  end

  def test_wraps_the_original_string
    assert_equal UNICODE_STRING, @chars.to_s
    assert_equal UNICODE_STRING, @chars.wrapped_string
  end

  def test_should_allow_method_calls_to_string
    @chars.wrapped_string.singleton_class.class_eval { def __method_for_multibyte_testing; "result"; end }

    assert_nothing_raised do
      @chars.__method_for_multibyte_testing
    end
    assert_raise NoMethodError do
      @chars.__unknown_method
    end
  end

  def test_forwarded_method_calls_should_return_new_chars_instance
    @chars.wrapped_string.singleton_class.class_eval { def __method_for_multibyte_testing; "result"; end }

    assert_kind_of @proxy_class, @chars.__method_for_multibyte_testing
    assert_not_equal @chars.object_id, @chars.__method_for_multibyte_testing.object_id
  end

  def test_forwarded_bang_method_calls_should_return_the_original_chars_instance_when_result_is_not_nil
    @chars.wrapped_string.singleton_class.class_eval { def __method_for_multibyte_testing!; "result"; end }

    assert_kind_of @proxy_class, @chars.__method_for_multibyte_testing!
    assert_equal @chars.object_id, @chars.__method_for_multibyte_testing!.object_id
  end

  def test_forwarded_bang_method_calls_should_return_nil_when_result_is_nil
    @chars.wrapped_string.singleton_class.class_eval { def __method_for_multibyte_testing_that_returns_nil!; end }

    assert_nil @chars.__method_for_multibyte_testing_that_returns_nil!
  end

  def test_methods_are_forwarded_to_wrapped_string_for_byte_strings
    assert_equal BYTE_STRING.length, BYTE_STRING.mb_chars.length
  end

  def test_forwarded_method_with_non_string_result_should_be_returned_verbatim
    str = +""
    str.singleton_class.class_eval { def __method_for_multibyte_testing_with_integer_result; 1; end }
    @chars.wrapped_string.singleton_class.class_eval { def __method_for_multibyte_testing_with_integer_result; 1; end }

    assert_equal str.__method_for_multibyte_testing_with_integer_result, @chars.__method_for_multibyte_testing_with_integer_result
  end

  def test_should_concatenate
    mb_a = (+"a").mb_chars
    mb_b = (+"b").mb_chars
    assert_equal "ab", mb_a + "b"
    assert_equal "ab", "a" + mb_b
    assert_equal "ab", mb_a + mb_b

    assert_equal "ab", mb_a << "b"
    assert_equal "ab", (+"a") << mb_b
    assert_equal "abb", mb_a << mb_b
  end

  def test_consumes_utf8_strings
    ActiveSupport::Deprecation.silence do
      assert @proxy_class.consumes?(UNICODE_STRING)
      assert @proxy_class.consumes?(ASCII_STRING)
      assert_not @proxy_class.consumes?(BYTE_STRING)
    end
  end

  def test_consumes_is_deprecated
    assert_deprecated { @proxy_class.consumes?(UNICODE_STRING) }
  end

  def test_concatenation_should_return_a_proxy_class_instance
    assert_equal ActiveSupport::Multibyte.proxy_class, ("a".mb_chars + "b").class
    assert_equal ActiveSupport::Multibyte.proxy_class, ((+"a").mb_chars << "b").class
  end

  def test_ascii_strings_are_treated_at_utf8_strings
    assert_equal ActiveSupport::Multibyte.proxy_class, ASCII_STRING.mb_chars.class
  end

  def test_concatenate_should_return_proxy_instance
    assert(("a".mb_chars + "b").kind_of?(@proxy_class))
    assert(("a".mb_chars + "b".mb_chars).kind_of?(@proxy_class))
    assert(((+"a").mb_chars << "b").kind_of?(@proxy_class))
    assert(((+"a").mb_chars << "b".mb_chars).kind_of?(@proxy_class))
  end

  def test_should_return_string_as_json
    assert_equal UNICODE_STRING, @chars.as_json
  end
end

class MultibyteCharsUTF8BehaviourTest < ActiveSupport::TestCase
  include MultibyteTestHelpers

  def setup
    @chars = UNICODE_STRING.dup.mb_chars
    # Ruby 1.9 only supports basic whitespace
    @whitespace = "\n\t "
  end

  def test_split_should_return_an_array_of_chars_instances
    @chars.split(//).each do |character|
      assert_kind_of ActiveSupport::Multibyte.proxy_class, character
    end
  end

  %w{capitalize downcase lstrip reverse rstrip swapcase upcase}.each do |method|
    class_eval(<<-EOTESTS, __FILE__, __LINE__ + 1)
      def test_#{method}_bang_should_return_self_when_modifying_wrapped_string
        chars = ' él piDió Un bUen café '.dup
        assert_equal chars.object_id, chars.send("#{method}!").object_id
      end

      def test_#{method}_bang_should_change_wrapped_string
        original = ' él piDió Un bUen café '.dup
        proxy = chars(original.dup)
        proxy.send("#{method}!")
        assert_not_equal original, proxy.to_s
      end
    EOTESTS
  end

  def test_tidy_bytes_bang_should_return_self
    assert_equal @chars.object_id, @chars.tidy_bytes!.object_id
  end

  def test_tidy_bytes_bang_should_change_wrapped_string
    original = +" Un bUen café \x92"
    proxy = chars(original.dup)
    proxy.tidy_bytes!
    assert_not_equal original, proxy.to_s
  end

  def test_unicode_string_should_have_utf8_encoding
    assert_equal Encoding::UTF_8, UNICODE_STRING.encoding
  end

  def test_identity
    assert_equal @chars, @chars
    assert @chars.eql?(@chars)
    assert_not @chars.eql?(UNICODE_STRING)
  end

  def test_string_methods_are_chainable
    assert chars(+"").insert(0, "").kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").rjust(1).kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").ljust(1).kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").center(1).kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").rstrip.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").lstrip.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").strip.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").reverse.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars(" ").slice(0).kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").limit(0).kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").upcase.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").downcase.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").capitalize.kind_of?(ActiveSupport::Multibyte.proxy_class)
    ActiveSupport::Deprecation.silence do
      assert chars("").normalize.kind_of?(ActiveSupport::Multibyte.proxy_class)
    end
    assert chars("").decompose.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").compose.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").tidy_bytes.kind_of?(ActiveSupport::Multibyte.proxy_class)
    assert chars("").swapcase.kind_of?(ActiveSupport::Multibyte.proxy_class)
  end

  def test_should_be_equal_to_the_wrapped_string
    assert_equal UNICODE_STRING, @chars
    assert_equal @chars, UNICODE_STRING
  end

  def test_should_not_be_equal_to_an_other_string
    assert_not_equal @chars, "other"
    assert_not_equal "other", @chars
  end

  def test_sortability
    words = %w(builder armor zebra).sort_by(&:mb_chars)
    assert_equal %w(armor builder zebra), words
  end

  def test_should_return_character_offset_for_regexp_matches
    assert_nil(@chars =~ /wrong/u)
    assert_equal 0, (@chars =~ /こ/u)
    assert_equal 0, (@chars =~ /こに/u)
    assert_equal 1, (@chars =~ /に/u)
    assert_equal 2, (@chars =~ /ち/u)
    assert_equal 3, (@chars =~ /わ/u)
  end

  def test_match_should_return_boolean_for_regexp_match
    assert_not @chars.match?(/wrong/u)
    assert @chars.match?(/こに/u)
    assert @chars.match?(/ち/u)
  end

  def test_should_use_character_offsets_for_insert_offsets
    assert_equal "", (+"").mb_chars.insert(0, "")
    assert_equal "こわにちわ", @chars.insert(1, "わ")
    assert_equal "こわわわにちわ", @chars.insert(2, "わわ")
    assert_equal "わこわわわにちわ", @chars.insert(0, "わ")
    assert_equal "わこわわわにちわ", @chars.wrapped_string
  end

  def test_insert_should_be_destructive
    @chars.insert(1, "わ")
    assert_equal "こわにちわ", @chars
  end

  def test_insert_throws_index_error
    assert_raise(IndexError) { @chars.insert(-12, "わ") }
    assert_raise(IndexError) { @chars.insert(12, "わ") }
  end

  def test_should_know_if_one_includes_the_other
    assert_includes @chars, ""
    assert_includes @chars, "ち"
    assert_includes @chars, "わ"
    assert_not_includes @chars, "こちわ"
    assert_not_includes @chars, "a"
  end

  def test_include_raises_when_nil_is_passed
    assert_raises TypeError, NoMethodError, "Expected chars.include?(nil) to raise TypeError or NoMethodError" do
      @chars.include?(nil)
    end
  end

  def test_index_should_return_character_offset
    assert_nil @chars.index("u")
    assert_equal 0, @chars.index("こに")
    assert_equal 2, @chars.index("ち")
    assert_equal 2, @chars.index("ち", -2)
    assert_nil @chars.index("ち", -1)
    assert_equal 3, @chars.index("わ")
    assert_equal 5, "ééxééx".mb_chars.index("x", 4)
  end

  def test_rindex_should_return_character_offset
    assert_nil @chars.rindex("u")
    assert_equal 1, @chars.rindex("に")
    assert_equal 2, @chars.rindex("ち", -2)
    assert_nil @chars.rindex("ち", -3)
    assert_equal 6, "Café périferôl".mb_chars.rindex("é")
    assert_equal 13, "Café périferôl".mb_chars.rindex(/\w/u)
  end

  def test_indexed_insert_should_take_character_offsets
    @chars[2] = "a"
    assert_equal "こにaわ", @chars
    @chars[2] = "ηη"
    assert_equal "こにηηわ", @chars
    @chars[3, 2] = "λλλ"
    assert_equal "こにηλλλ", @chars
    @chars[1, 0] = "λ"
    assert_equal "こλにηλλλ", @chars
    @chars[4..6] = "ηη"
    assert_equal "こλにηηη", @chars
    @chars[/ηη/] = "λλλ"
    assert_equal "こλにλλλη", @chars
    @chars[/(λλ)(.)/, 2] = "α"
    assert_equal "こλにλλαη", @chars
    @chars["α"] = "¢"
    assert_equal "こλにλλ¢η", @chars
    @chars["λλ"] = "ααα"
    assert_equal "こλにααα¢η", @chars
  end

  def test_indexed_insert_should_raise_on_index_overflow
    before = @chars.to_s
    assert_raise(IndexError) { @chars[10] = "a" }
    assert_raise(IndexError) { @chars[10, 4] = "a" }
    assert_raise(IndexError) { @chars[/ii/] = "a" }
    assert_raise(IndexError) { @chars[/()/, 10] = "a" }
    assert_equal before, @chars
  end

  def test_indexed_insert_should_raise_on_range_overflow
    before = @chars.to_s
    assert_raise(RangeError) { @chars[10..12] = "a" }
    assert_equal before, @chars
  end

  def test_rjust_should_raise_argument_errors_on_bad_arguments
    assert_raise(ArgumentError) { @chars.rjust(10, "") }
    assert_raise(ArgumentError) { @chars.rjust }
  end

  def test_rjust_should_count_characters_instead_of_bytes
    assert_equal UNICODE_STRING, @chars.rjust(-3)
    assert_equal UNICODE_STRING, @chars.rjust(0)
    assert_equal UNICODE_STRING, @chars.rjust(4)
    assert_equal " #{UNICODE_STRING}", @chars.rjust(5)
    assert_equal "   #{UNICODE_STRING}", @chars.rjust(7)
    assert_equal "---#{UNICODE_STRING}", @chars.rjust(7, "-")
    assert_equal "ααα#{UNICODE_STRING}", @chars.rjust(7, "α")
    assert_equal "aba#{UNICODE_STRING}", @chars.rjust(7, "ab")
    assert_equal "αηα#{UNICODE_STRING}", @chars.rjust(7, "αη")
    assert_equal "αηαη#{UNICODE_STRING}", @chars.rjust(8, "αη")
  end

  def test_ljust_should_raise_argument_errors_on_bad_arguments
    assert_raise(ArgumentError) { @chars.ljust(10, "") }
    assert_raise(ArgumentError) { @chars.ljust }
  end

  def test_ljust_should_count_characters_instead_of_bytes
    assert_equal UNICODE_STRING, @chars.ljust(-3)
    assert_equal UNICODE_STRING, @chars.ljust(0)
    assert_equal UNICODE_STRING, @chars.ljust(4)
    assert_equal "#{UNICODE_STRING} ", @chars.ljust(5)
    assert_equal "#{UNICODE_STRING}   ", @chars.ljust(7)
    assert_equal "#{UNICODE_STRING}---", @chars.ljust(7, "-")
    assert_equal "#{UNICODE_STRING}ααα", @chars.ljust(7, "α")
    assert_equal "#{UNICODE_STRING}aba", @chars.ljust(7, "ab")
    assert_equal "#{UNICODE_STRING}αηα", @chars.ljust(7, "αη")
    assert_equal "#{UNICODE_STRING}αηαη", @chars.ljust(8, "αη")
  end

  def test_center_should_raise_argument_errors_on_bad_arguments
    assert_raise(ArgumentError) { @chars.center(10, "") }
    assert_raise(ArgumentError) { @chars.center }
  end

  def test_center_should_count_characters_instead_of_bytes
    assert_equal UNICODE_STRING, @chars.center(-3)
    assert_equal UNICODE_STRING, @chars.center(0)
    assert_equal UNICODE_STRING, @chars.center(4)
    assert_equal "#{UNICODE_STRING} ", @chars.center(5)
    assert_equal " #{UNICODE_STRING} ", @chars.center(6)
    assert_equal " #{UNICODE_STRING}  ", @chars.center(7)
    assert_equal "--#{UNICODE_STRING}--", @chars.center(8, "-")
    assert_equal "--#{UNICODE_STRING}---", @chars.center(9, "-")
    assert_equal "αα#{UNICODE_STRING}αα", @chars.center(8, "α")
    assert_equal "αα#{UNICODE_STRING}ααα", @chars.center(9, "α")
    assert_equal "a#{UNICODE_STRING}ab", @chars.center(7, "ab")
    assert_equal "ab#{UNICODE_STRING}ab", @chars.center(8, "ab")
    assert_equal "abab#{UNICODE_STRING}abab", @chars.center(12, "ab")
    assert_equal #{UNICODE_STRING}αη", @chars.center(7, "αη")
    assert_equal "αη#{UNICODE_STRING}αη", @chars.center(8, "αη")
  end

  def test_lstrip_strips_whitespace_from_the_left_of_the_string
    assert_equal UNICODE_STRING, UNICODE_STRING.mb_chars.lstrip
    assert_equal UNICODE_STRING, (@whitespace + UNICODE_STRING).mb_chars.lstrip
    assert_equal UNICODE_STRING + @whitespace, (@whitespace + UNICODE_STRING + @whitespace).mb_chars.lstrip
  end

  def test_rstrip_strips_whitespace_from_the_right_of_the_string
    assert_equal UNICODE_STRING, UNICODE_STRING.mb_chars.rstrip
    assert_equal UNICODE_STRING, (UNICODE_STRING + @whitespace).mb_chars.rstrip
    assert_equal @whitespace + UNICODE_STRING, (@whitespace + UNICODE_STRING + @whitespace).mb_chars.rstrip
  end

  def test_strip_strips_whitespace
    assert_equal UNICODE_STRING, UNICODE_STRING.mb_chars.strip
    assert_equal UNICODE_STRING, (@whitespace + UNICODE_STRING).mb_chars.strip
    assert_equal UNICODE_STRING, (UNICODE_STRING + @whitespace).mb_chars.strip
    assert_equal UNICODE_STRING, (@whitespace + UNICODE_STRING + @whitespace).mb_chars.strip
  end

  def test_stripping_whitespace_leaves_whitespace_within_the_string_intact
    string_with_whitespace = UNICODE_STRING + @whitespace + UNICODE_STRING
    assert_equal string_with_whitespace, string_with_whitespace.mb_chars.strip
    assert_equal string_with_whitespace, string_with_whitespace.mb_chars.lstrip
    assert_equal string_with_whitespace, string_with_whitespace.mb_chars.rstrip
  end

  def test_size_returns_characters_instead_of_bytes
    assert_equal 0, "".mb_chars.size
    assert_equal 4, @chars.size
    assert_equal 4, @chars.length
    assert_equal 5, ASCII_STRING.mb_chars.size
  end

  def test_reverse_reverses_characters
    assert_equal "", "".mb_chars.reverse
    assert_equal "わちにこ", @chars.reverse
  end

  def test_reverse_should_work_with_normalized_strings
    str = "bös"
    reversed_str = "söb"
    ActiveSupport::Deprecation.silence do
      assert_equal chars(reversed_str).normalize(:kc), chars(str).normalize(:kc).reverse
      assert_equal chars(reversed_str).normalize(:c), chars(str).normalize(:c).reverse
      assert_equal chars(reversed_str).normalize(:d), chars(str).normalize(:d).reverse
      assert_equal chars(reversed_str).normalize(:kd), chars(str).normalize(:kd).reverse
    end
    assert_equal chars(reversed_str).decompose, chars(str).decompose.reverse
    assert_equal chars(reversed_str).compose, chars(str).compose.reverse
  end

  def test_slice_should_take_character_offsets
    assert_nil "".mb_chars.slice(0)
    assert_equal "こ", @chars.slice(0)
    assert_equal "わ", @chars.slice(3)
    assert_nil "".mb_chars.slice(-1..1)
    assert_nil "".mb_chars.slice(-1, 1)
    assert_equal "", "".mb_chars.slice(0..10)
    assert_equal "にちわ", @chars.slice(1..3)
    assert_equal "にちわ", @chars.slice(1, 3)
    assert_equal "こ", @chars.slice(0, 1)
    assert_equal "ちわ", @chars.slice(2..10)
    assert_equal "", @chars.slice(4..10)
    assert_equal "に", @chars.slice(/に/u)
    assert_equal "にち", @chars.slice(/に./u)
    assert_nil @chars.slice(/unknown/u)
    assert_equal "にち", @chars.slice(/(にち)/u, 1)
    assert_nil @chars.slice(/(にち)/u, 2)
    assert_nil @chars.slice(7..6)
  end

  def test_slice_bang_returns_sliced_out_substring
    assert_equal "にち", @chars.slice!(1..2)
  end

  def test_slice_bang_returns_nil_on_out_of_bound_arguments
    assert_nil @chars.mb_chars.slice!(9..10)
  end

  def test_slice_bang_removes_the_slice_from_the_receiver
    chars = (+"úüù").mb_chars
    chars.slice!(0, 2)
    assert_equal "ù", chars
  end

  def test_slice_bang_returns_nil_and_does_not_modify_receiver_if_out_of_bounds
    string = +"úüù"
    chars = string.mb_chars
    assert_nil chars.slice!(4, 5)
    assert_equal "úüù", chars
    assert_equal "úüù", string
  end

  def test_slice_should_throw_exceptions_on_invalid_arguments
    assert_raise(TypeError) { @chars.slice(2..3, 1) }
    assert_raise(TypeError) { @chars.slice(1, 2..3) }
    assert_raise(ArgumentError) { @chars.slice(1, 1, 1) }
  end

  def test_ord_should_return_unicode_value_for_first_character
    assert_equal 12371, @chars.ord
  end

  def test_upcase_should_upcase_ascii_characters
    assert_equal "", "".mb_chars.upcase
    assert_equal "ABC", "aBc".mb_chars.upcase
  end

  def test_downcase_should_downcase_ascii_characters
    assert_equal "", "".mb_chars.downcase
    assert_equal "abc", "aBc".mb_chars.downcase
  end

  def test_swapcase_should_swap_ascii_characters
    assert_equal "", "".mb_chars.swapcase
    assert_equal "AbC", "aBc".mb_chars.swapcase
  end

  def test_capitalize_should_work_on_ascii_characters
    assert_equal "", "".mb_chars.capitalize
    assert_equal "Abc", "abc".mb_chars.capitalize
  end

  def test_titleize_should_work_on_ascii_characters
    assert_equal "", "".mb_chars.titleize
    assert_equal "Abc Abc", "abc abc".mb_chars.titleize
  end

  def test_respond_to_knows_which_methods_the_proxy_responds_to
    assert_respond_to "".mb_chars, :slice # Defined on Chars
    assert_respond_to "".mb_chars, :capitalize! # Defined on Chars
    assert_respond_to "".mb_chars, :gsub # Defined on String
    assert_not_respond_to "".mb_chars, :undefined_method # Not defined
  end

  def test_method_works_for_proxyed_methods
    assert_equal "ll", "hello".mb_chars.method(:slice).call(2..3) # Defined on Chars
    chars = +"hello".mb_chars
    assert_equal "Hello", chars.method(:capitalize!).call # Defined on Chars
    assert_equal "Hello", chars
    assert_equal "jello", "hello".mb_chars.method(:gsub).call(/h/, "j") # Defined on String
    assert_raise(NameError) { "".mb_chars.method(:undefined_method) } # Not defined
  end

  def test_acts_like_string
    assert_predicate "Bambi".mb_chars, :acts_like_string?
  end
end

# The default Multibyte Chars proxy has more features than the normal string implementation. Tests
# for the implementation of these features should run on all Ruby versions and shouldn't be tested
# through the proxy methods.
class MultibyteCharsExtrasTest < ActiveSupport::TestCase
  include MultibyteTestHelpers

  def test_upcase_should_be_unicode_aware
    assert_equal "АБВГД\0F", chars("аБвгд\0f").upcase
    assert_equal "こにちわ", chars("こにちわ").upcase
  end

  def test_downcase_should_be_unicode_aware
    assert_equal "абвгд\0f", chars("аБвгд\0F").downcase
    assert_equal "こにちわ", chars("こにちわ").downcase
  end

  def test_swapcase_should_be_unicode_aware
    assert_equal "аaéÜ\0f", chars("АAÉü\0F").swapcase
    assert_equal "こにちわ", chars("こにちわ").swapcase
  end

  def test_capitalize_should_be_unicode_aware
    { "аБвг аБвг" => "Абвг абвг",
      "аБвг АБВГ" => "Абвг абвг",
      "АБВГ АБВГ" => "Абвг абвг",
      "" => "" }.each do |f, t|
      assert_equal t, chars(f).capitalize
    end
  end

  def test_titleize_should_be_unicode_aware
    assert_equal "Él Que Se Enteró", chars("ÉL QUE SE ENTERÓ").titleize
    assert_equal "Абвг Абвг", chars("аБвг аБвг").titleize
  end

  def test_titleize_should_not_affect_characters_that_do_not_case_fold
    assert_equal "日本語", chars("日本語").titleize
  end

  def test_limit_should_not_break_on_blank_strings
    example = chars("")
    assert_equal example, example.limit(0)
    assert_equal example, example.limit(1)
  end

  def test_limit_should_work_on_a_multibyte_string
    example = chars(UNICODE_STRING)
    bytesize = UNICODE_STRING.bytesize

    assert_equal UNICODE_STRING, example.limit(bytesize)
    assert_equal "", example.limit(0)
    assert_equal "", example.limit(1)
    assert_equal "こ", example.limit(3)
    assert_equal "こに", example.limit(6)
    assert_equal "こに", example.limit(8)
    assert_equal "こにち", example.limit(9)
    assert_equal "こにちわ", example.limit(50)
  end

  def test_limit_should_work_on_an_ascii_string
    ascii = chars(ASCII_STRING)
    assert_equal ASCII_STRING, ascii.limit(ASCII_STRING.length)
    assert_equal "", ascii.limit(0)
    assert_equal "o", ascii.limit(1)
    assert_equal "oh", ascii.limit(2)
    assert_equal "ohay", ascii.limit(4)
    assert_equal "ohayo", ascii.limit(50)
  end

  def test_limit_should_keep_under_the_specified_byte_limit
    example = chars(UNICODE_STRING)
    (1..UNICODE_STRING.length).each do |limit|
      assert example.limit(limit).to_s.length <= limit
    end
  end

  def test_composition_exclusion_is_set_up_properly
    # Normalization of DEVANAGARI LETTER QA breaks when composition exclusion isn't used correctly
    qa = [0x915, 0x93c].pack("U*")
    ActiveSupport::Deprecation.silence do
      assert_equal qa, chars(qa).normalize(:c)
    end
  end

  # Test for the Public Review Issue #29, bad explanation of composition might lead to a
  # bad implementation: http://www.unicode.org/review/pr-29.html
  def test_normalization_C_pri_29
    [
      [0x0B47, 0x0300, 0x0B3E],
      [0x1100, 0x0300, 0x1161]
    ].map { |c| c.pack("U*") }.each do |c|
      ActiveSupport::Deprecation.silence do
        assert_equal_codepoints c, chars(c).normalize(:c)
      end
    end
  end

  def test_normalization_shouldnt_strip_null_bytes
    null_byte_str = "Test\0test"

    ActiveSupport::Deprecation.silence do
      assert_equal null_byte_str, chars(null_byte_str).normalize(:kc)
      assert_equal null_byte_str, chars(null_byte_str).normalize(:c)
      assert_equal null_byte_str, chars(null_byte_str).normalize(:d)
      assert_equal null_byte_str, chars(null_byte_str).normalize(:kd)
    end
    assert_equal null_byte_str, chars(null_byte_str).decompose
    assert_equal null_byte_str, chars(null_byte_str).compose
  end

  def test_simple_normalization
    comp_str = [
      44,  # LATIN CAPITAL LETTER D
      307, # COMBINING DOT ABOVE
      328, # COMBINING OGONEK
      323 # COMBINING DOT BELOW
    ].pack("U*")

    ActiveSupport::Deprecation.silence do
      assert_equal_codepoints "", chars("").normalize
      assert_equal_codepoints [44, 105, 106, 328, 323].pack("U*"), chars(comp_str).normalize(:kc).to_s
      assert_equal_codepoints [44, 307, 328, 323].pack("U*"), chars(comp_str).normalize(:c).to_s
      assert_equal_codepoints [44, 307, 110, 780, 78, 769].pack("U*"), chars(comp_str).normalize(:d).to_s
      assert_equal_codepoints [44, 105, 106, 110, 780, 78, 769].pack("U*"), chars(comp_str).normalize(:kd).to_s
    end
  end

  def test_should_compute_grapheme_length
    [
      ["", 0],
      ["abc", 3],
      ["こにちわ", 4],
      [[0x0924, 0x094D, 0x0930].pack("U*"), 2],
      # GB3
      [%w(cr lf), 1],
      # GB4
      [%w(cr n), 2],
      [%w(lf n), 2],
      [%w(control n), 2],
      [%w(cr extend), 2],
      [%w(lf extend), 2],
      [%w(control extend), 2],
      # GB 5
      [%w(n cr), 2],
      [%w(n lf), 2],
      [%w(n control), 2],
      [%w(extend cr), 2],
      [%w(extend lf), 2],
      [%w(extend control), 2],
      # GB 6
      [%w(l l), 1],
      [%w(l v), 1],
      [%w(l lv), 1],
      [%w(l lvt), 1],
      # GB7
      [%w(lv v), 1],
      [%w(lv t), 1],
      [%w(v v), 1],
      [%w(v t), 1],
      # GB8
      [%w(lvt t), 1],
      [%w(t t), 1],
      # GB8a
      [%w(r r), 1],
      # GB9
      [%w(n extend), 1],
      # GB9a
      [%w(n spacingmark), 1],
      # GB10
      [%w(n n), 2],
      # Other
      [%w(n cr lf n), 3],
      [%w(n l v t), 2],
      [%w(cr extend n), 3],
    ].each do |input, expected_length|
      if input.kind_of?(Array)
        str = string_from_classes(input)
      else
        str = input
      end
      assert_equal expected_length, chars(str).grapheme_length, input.inspect
    end
  end

  def test_tidy_bytes_should_tidy_bytes
    single_byte_cases = {
      "\x21" => "!",   # Valid ASCII byte, low
      "\x41" => "A",   # Valid ASCII byte, mid
      "\x7E" => "~",   # Valid ASCII byte, high
      "\x80" => "€",   # Continuation byte, low (cp125)
      "\x94" => "”",   # Continuation byte, mid (cp125)
      "\x9F" => "Ÿ",   # Continuation byte, high (cp125)
      "\xC0" => "À",   # Overlong encoding, start of 2-byte sequence, but codepoint < 128
      "\xC1" => "Á",   # Overlong encoding, start of 2-byte sequence, but codepoint < 128
      "\xC2" => "Â",   # Start of 2-byte sequence, low
      "\xC8" => "È",   # Start of 2-byte sequence, mid
      "\xDF" => "ß",   # Start of 2-byte sequence, high
      "\xE0" => "à",   # Start of 3-byte sequence, low
      "\xE8" => "è",   # Start of 3-byte sequence, mid
      "\xEF" => "ï",   # Start of 3-byte sequence, high
      "\xF0" => "ð",   # Start of 4-byte sequence
      "\xF1" => "ñ",   # Unused byte
      "\xFF" => "ÿ",   # Restricted byte
      "\x00" => "\x00" # null char
    }

    single_byte_cases.each do |bad, good|
      assert_equal good, chars(bad).tidy_bytes.to_s
      assert_equal "#{good}#{good}", chars("#{bad}#{bad}").tidy_bytes
      assert_equal "#{good}#{good}#{good}", chars("#{bad}#{bad}#{bad}").tidy_bytes
      assert_equal "#{good}a", chars("#{bad}a").tidy_bytes
      assert_equal "#{good}á", chars("#{bad}á").tidy_bytes
      assert_equal "a#{good}a", chars("a#{bad}a").tidy_bytes
      assert_equal #{good}á", chars(#{bad}á").tidy_bytes
      assert_equal "a#{good}", chars("a#{bad}").tidy_bytes
      assert_equal #{good}", chars(#{bad}").tidy_bytes
    end

    byte_string = "\270\236\010\210\245"
    tidy_string = [0xb8, 0x17e, 0x8, 0x2c6, 0xa5].pack("U*")
    assert_equal_codepoints tidy_string, chars(byte_string).tidy_bytes
    assert_nothing_raised { chars(byte_string).tidy_bytes.to_s.unpack("U*") }

    # UTF-8 leading byte followed by too few continuation bytes
    assert_equal_codepoints "\xc3\xb0\xc2\xa5\xc2\xa4\x21", chars("\xf0\xa5\xa4\x21").tidy_bytes
  end

  def test_tidy_bytes_should_forcibly_tidy_bytes_if_specified
    byte_string = "\xF0\xA5\xA4\xA4" # valid as both CP-1252 and UTF-8, but with different interpretations.
    assert_not_equal "𥤤", chars(byte_string).tidy_bytes
    # Forcible conversion to UTF-8
    assert_equal "𥤤", chars(byte_string).tidy_bytes(true)
  end

  def test_class_is_not_forwarded
    assert_equal BYTE_STRING.dup.mb_chars.class, ActiveSupport::Multibyte::Chars
  end

  def test_unicode_normalize_deprecation
    # String#unicode_normalize default form is `:nfc`, and
    # different than Multibyte::Unicode default, `:nkfc`.
    # Deprecation should suggest the right form if no params
    # are given and default is used.
    assert_deprecated(/unicode_normalize\(:nfkc\)/) do
      ActiveSupport::Multibyte::Unicode.normalize("")
    end

    assert_deprecated(/unicode_normalize\(:nfd\)/) do
      ActiveSupport::Multibyte::Unicode.normalize("", :d)
    end
  end

  def test_chars_normalize_deprecation
    # String#unicode_normalize default form is `:nfc`, and
    # different than Multibyte::Unicode default, `:nkfc`.
    # Deprecation should suggest the right form if no params
    # are given and default is used.
    assert_deprecated(/unicode_normalize\(:nfkc\)/) do
      "".mb_chars.normalize
    end

    assert_deprecated(/unicode_normalize\(:nfc\)/) { "".mb_chars.normalize(:c) }
    assert_deprecated(/unicode_normalize\(:nfd\)/) { "".mb_chars.normalize(:d) }
    assert_deprecated(/unicode_normalize\(:nfkc\)/) { "".mb_chars.normalize(:kc) }
    assert_deprecated(/unicode_normalize\(:nfkd\)/) { "".mb_chars.normalize(:kd) }
  end

  def test_unicode_deprecations
    assert_deprecated { ActiveSupport::Multibyte::Unicode.downcase("") }
    assert_deprecated { ActiveSupport::Multibyte::Unicode.upcase("") }
    assert_deprecated { ActiveSupport::Multibyte::Unicode.swapcase("") }
  end

  def test_normalize_non_unicode_string
    # Fullwidth Latin Capital Letter A in Windows 31J
    str = "\u{ff21}".encode(Encoding::Windows_31J)
    assert_raise Encoding::CompatibilityError do
      ActiveSupport::Deprecation.silence do
        ActiveSupport::Multibyte::Unicode.normalize(str)
      end
    end
  end

  private
    def string_from_classes(classes)
      # Characters from the character classes as described in UAX #29
      character_from_class = {
        l: 0x1100, v: 0x1160, t: 0x11A8, lv: 0xAC00, lvt: 0xAC01, cr: 0x000D, lf: 0x000A,
        extend: 0x094D, n: 0x64, spacingmark: 0x0903, r: 0x1F1E6, control: 0x0001
      }
      classes.collect do |k|
        character_from_class[k.intern]
      end.pack("U*")
    end
end