summaryrefslogtreecommitdiff
path: root/test/irb/test_context.rb
blob: c4ca56aba60d2a8a69eb95e5b4b73a77a3b461c3 (plain)
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
# frozen_string_literal: false
require 'tempfile'
require 'irb'
require 'rubygems' if defined?(Gem)

require_relative "helper"

module TestIRB
  class TestContext < TestCase
    def setup
      IRB.init_config(nil)
      IRB.conf[:USE_SINGLELINE] = false
      IRB.conf[:VERBOSE] = false
      workspace = IRB::WorkSpace.new(Object.new)
      @context = IRB::Context.new(nil, workspace, TestInputMethod.new)

      @get_screen_size = Reline.method(:get_screen_size)
      Reline.instance_eval { undef :get_screen_size }
      def Reline.get_screen_size
        [36, 80]
      end
      save_encodings
    end

    def teardown
      Reline.instance_eval { undef :get_screen_size }
      Reline.define_singleton_method(:get_screen_size, @get_screen_size)
      restore_encodings
    end

    def test_last_value
      assert_nil(@context.last_value)
      assert_nil(@context.evaluate('_', 1))
      obj = Object.new
      @context.set_last_value(obj)
      assert_same(obj, @context.last_value)
      assert_same(obj, @context.evaluate('_', 1))
    end

    def test_evaluate_with_exception
      assert_nil(@context.evaluate("$!", 1))
      e = assert_raise_with_message(RuntimeError, 'foo') {
        @context.evaluate("raise 'foo'", 1)
      }
      assert_equal('foo', e.message)
      assert_same(e, @context.evaluate('$!', 1, exception: e))
      e = assert_raise(SyntaxError) {
        @context.evaluate("1,2,3", 1, exception: e)
      }
      assert_match(/\A\(irb\):1:/, e.message)
      assert_not_match(/rescue _\.class/, e.message)
    end

    def test_evaluate_with_encoding_error_without_lineno
      assert_raise_with_message(EncodingError, /invalid symbol/) {
        @context.evaluate(%q[:"\xAE"], 1)
        # The backtrace of this invalid encoding hash doesn't contain lineno.
      }
    end

    def test_evaluate_still_emits_warning
      assert_warning("(irb):1: warning: END in method; use at_exit\n") do
        @context.evaluate(%q[def foo; END {}; end], 1)
      end
    end

    def test_eval_input
      verbose, $VERBOSE = $VERBOSE, nil
      input = TestInputMethod.new([
        "raise 'Foo'\n",
        "_\n",
        "0\n",
        "_\n",
      ])
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_pattern_list([:*, /\(irb\):1:in `<main>': Foo \(RuntimeError\)\n/,
                           :*, /#<RuntimeError: Foo>\n/,
                           :*, /0$/,
                           :*, /0$/,
                           /\s*/], out)
    ensure
      $VERBOSE = verbose
    end

    def test_eval_input_raise2x
      input = TestInputMethod.new([
        "raise 'Foo'\n",
        "raise 'Bar'\n",
        "_\n",
      ])
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_pattern_list([
          :*, /\(irb\):1:in `<main>': Foo \(RuntimeError\)\n/,
          :*, /\(irb\):2:in `<main>': Bar \(RuntimeError\)\n/,
          :*, /#<RuntimeError: Bar>\n/,
        ], out)
    end

    def test_output_to_pipe
      require 'stringio'
      input = TestInputMethod.new(["n=1"])
      input.instance_variable_set(:@stdout, StringIO.new)
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      irb.context.echo_on_assignment = :truncate
      irb.context.prompt_mode = :DEFAULT
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal "=> 1\n", out
    end

    {
      successful: [
        [false, "class Foo < Struct.new(:bar); end; Foo.new(123)\n", /#<struct bar=123>/],
        [:p, "class Foo < Struct.new(:bar); end; Foo.new(123)\n", /#<struct bar=123>/],
        [true, "class Foo < Struct.new(:bar); end; Foo.new(123)\n", /#<struct #<Class:.*>::Foo bar=123>/],
        [:yaml, "123", /--- 123\n/],
        [:marshal, "123", Marshal.dump(123)],
      ],
      failed: [
        [false, "BasicObject.new", /#<NoMethodError: undefined method `to_s' for/],
        [:p, "class Foo; undef inspect ;end; Foo.new", /#<NoMethodError: undefined method `inspect' for/],
        [:yaml, "BasicObject.new", /#<NoMethodError: undefined method `inspect' for/],
        [:marshal, "[Object.new, Class.new]", /#<TypeError: can't dump anonymous class #<Class:/]
      ]
    }.each do |scenario, cases|
      cases.each do |inspect_mode, input, expected|
        define_method "test_#{inspect_mode}_inspect_mode_#{scenario}" do
          verbose, $VERBOSE = $VERBOSE, nil
          irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), TestInputMethod.new([input]))
          irb.context.inspect_mode = inspect_mode
          out, err = capture_output do
            irb.eval_input
          end
          assert_empty err
          assert_match(expected, out)
        ensure
          $VERBOSE = verbose
        end
      end
    end

    def test_object_inspection_handles_basic_object
      verbose, $VERBOSE = $VERBOSE, nil
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), TestInputMethod.new(["BasicObject.new"]))
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_not_match(/NoMethodError/, out)
      assert_match(/#<BasicObject:.*>/, out)
    ensure
      $VERBOSE = verbose
    end

    def test_object_inspection_falls_back_to_kernel_inspect_when_errored
      verbose, $VERBOSE = $VERBOSE, nil
      main = Object.new
      main.singleton_class.module_eval <<~RUBY
        class Foo
          def inspect
            raise "foo"
          end
        end
      RUBY

      irb = IRB::Irb.new(IRB::WorkSpace.new(main), TestInputMethod.new(["Foo.new"]))
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_match(/An error occurred when inspecting the object: #<RuntimeError: foo>/, out)
      assert_match(/Result of Kernel#inspect: #<#<Class:.*>::Foo:/, out)
    ensure
      $VERBOSE = verbose
    end

    def test_object_inspection_prints_useful_info_when_kernel_inspect_also_errored
      verbose, $VERBOSE = $VERBOSE, nil
      main = Object.new
      main.singleton_class.module_eval <<~RUBY
        class Foo
          def initialize
            # Kernel#inspect goes through instance variables with #inspect
            # So this will cause Kernel#inspect to fail
            @foo = BasicObject.new
          end

          def inspect
            raise "foo"
          end
        end
      RUBY

      irb = IRB::Irb.new(IRB::WorkSpace.new(main), TestInputMethod.new(["Foo.new"]))
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_match(/An error occurred when inspecting the object: #<RuntimeError: foo>/, out)
      assert_match(/An error occurred when running Kernel#inspect: #<NoMethodError: undefined method `inspect' for/, out)
    ensure
      $VERBOSE = verbose
    end

    def test_default_config
      assert_equal(true, @context.use_autocomplete?)
    end

    def test_assignment_expression
      input = TestInputMethod.new
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      [
        "foo = bar",
        "@foo = bar",
        "$foo = bar",
        "@@foo = bar",
        "::Foo = bar",
        "a::Foo = bar",
        "Foo = bar",
        "foo.bar = 1",
        "foo[1] = bar",
        "foo += bar",
        "foo -= bar",
        "foo ||= bar",
        "foo &&= bar",
        "foo, bar = 1, 2",
        "foo.bar=(1)",
        "foo; foo = bar",
        "foo; foo = bar; ;\n ;",
        "foo\nfoo = bar",
      ].each do |exp|
        assert(
          irb.assignment_expression?(exp),
          "#{exp.inspect}: should be an assignment expression"
        )
      end

      [
        "foo",
        "foo.bar",
        "foo[0]",
        "foo = bar; foo",
        "foo = bar\nfoo",
      ].each do |exp|
        refute(
          irb.assignment_expression?(exp),
          "#{exp.inspect}: should not be an assignment expression"
        )
      end
    end

    def test_assignment_expression_with_local_variable
      input = TestInputMethod.new
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      code = "a /1;x=1#/"
      refute(irb.assignment_expression?(code), "#{code}: should not be an assignment expression")
      irb.context.workspace.binding.eval('a = 1')
      assert(irb.assignment_expression?(code), "#{code}: should be an assignment expression")
      refute(irb.assignment_expression?(""), "empty code should not be an assignment expression")
    end

    def test_echo_on_assignment
      input = TestInputMethod.new([
        "a = 1\n",
        "a\n",
        "a, b = 2, 3\n",
        "a\n",
        "b\n",
        "b = 4\n",
        "_\n"
      ])
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      irb.context.return_format = "=> %s\n"

      # The default
      irb.context.echo = true
      irb.context.echo_on_assignment = false
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("=> 1\n=> 2\n=> 3\n=> 4\n", out)

      # Everything is output, like before echo_on_assignment was introduced
      input.reset
      irb.context.echo = true
      irb.context.echo_on_assignment = true
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("=> 1\n=> 1\n=> [2, 3]\n=> 2\n=> 3\n=> 4\n=> 4\n", out)

      # Nothing is output when echo is false
      input.reset
      irb.context.echo = false
      irb.context.echo_on_assignment = false
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("", out)

      # Nothing is output when echo is false even if echo_on_assignment is true
      input.reset
      irb.context.echo = false
      irb.context.echo_on_assignment = true
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("", out)
    end

    def test_omit_on_assignment
      input = TestInputMethod.new([
        "a = [1] * 100\n",
        "a\n",
      ])
      value = [1] * 100
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      irb.context.return_format = "=> %s\n"

      irb.context.echo = true
      irb.context.echo_on_assignment = false
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("=> \n#{value.pretty_inspect}", out)

      input.reset
      irb.context.echo = true
      irb.context.echo_on_assignment = :truncate
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("=> \n#{value.pretty_inspect[0..3]}...\n=> \n#{value.pretty_inspect}", out)

      input.reset
      irb.context.echo = true
      irb.context.echo_on_assignment = true
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("=> \n#{value.pretty_inspect}=> \n#{value.pretty_inspect}", out)

      input.reset
      irb.context.echo = false
      irb.context.echo_on_assignment = false
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("", out)

      input.reset
      irb.context.echo = false
      irb.context.echo_on_assignment = :truncate
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("", out)

      input.reset
      irb.context.echo = false
      irb.context.echo_on_assignment = true
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("", out)
    end

    def test_omit_multiline_on_assignment
      without_colorize do
        input = TestInputMethod.new([
          "class A; def inspect; ([?* * 1000] * 3).join(%{\\n}); end; end; a = A.new\n",
          "a\n"
        ])
        value = ([?* * 1000] * 3).join(%{\n})
        value_first_line = (?* * 1000).to_s
        irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
        irb.context.return_format = "=> %s\n"

        irb.context.echo = true
        irb.context.echo_on_assignment = false
        out, err = capture_output do
          irb.eval_input
        end
        assert_empty err
        assert_equal("=> \n#{value}\n", out)
        irb.context.evaluate('A.remove_method(:inspect)', 0)

        input.reset
        irb.context.echo = true
        irb.context.echo_on_assignment = :truncate
        out, err = capture_output do
          irb.eval_input
        end
        assert_empty err
        assert_equal("=> #{value_first_line[0..(input.winsize.last - 9)]}...\n=> \n#{value}\n", out)
        irb.context.evaluate('A.remove_method(:inspect)', 0)

        input.reset
        irb.context.echo = true
        irb.context.echo_on_assignment = true
        out, err = capture_output do
          irb.eval_input
        end
        assert_empty err
        assert_equal("=> \n#{value}\n=> \n#{value}\n", out)
        irb.context.evaluate('A.remove_method(:inspect)', 0)

        input.reset
        irb.context.echo = false
        irb.context.echo_on_assignment = false
        out, err = capture_output do
          irb.eval_input
        end
        assert_empty err
        assert_equal("", out)
        irb.context.evaluate('A.remove_method(:inspect)', 0)

        input.reset
        irb.context.echo = false
        irb.context.echo_on_assignment = :truncate
        out, err = capture_output do
          irb.eval_input
        end
        assert_empty err
        assert_equal("", out)
        irb.context.evaluate('A.remove_method(:inspect)', 0)

        input.reset
        irb.context.echo = false
        irb.context.echo_on_assignment = true
        out, err = capture_output do
          irb.eval_input
        end
        assert_empty err
        assert_equal("", out)
        irb.context.evaluate('A.remove_method(:inspect)', 0)
      end
    end

    def test_echo_on_assignment_conf
      # Default
      IRB.conf[:ECHO] = nil
      IRB.conf[:ECHO_ON_ASSIGNMENT] = nil
      without_colorize do
        input = TestInputMethod.new()
        irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)

        assert(irb.context.echo?, "echo? should be true by default")
        assert_equal(:truncate, irb.context.echo_on_assignment?, "echo_on_assignment? should be :truncate by default")

        # Explicitly set :ECHO to false
        IRB.conf[:ECHO] = false
        irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)

        refute(irb.context.echo?, "echo? should be false when IRB.conf[:ECHO] is set to false")
        assert_equal(:truncate, irb.context.echo_on_assignment?, "echo_on_assignment? should be :truncate by default")

        # Explicitly set :ECHO_ON_ASSIGNMENT to true
        IRB.conf[:ECHO] = nil
        IRB.conf[:ECHO_ON_ASSIGNMENT] = false
        irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)

        assert(irb.context.echo?, "echo? should be true by default")
        refute(irb.context.echo_on_assignment?, "echo_on_assignment? should be false when IRB.conf[:ECHO_ON_ASSIGNMENT] is set to false")
      end
    end

    def test_multiline_output_on_default_inspector
      main = Object.new
      def main.inspect
        "abc\ndef"
      end

      without_colorize do
        input = TestInputMethod.new([
          "self"
        ])
        irb = IRB::Irb.new(IRB::WorkSpace.new(main), input)
        irb.context.return_format = "=> %s\n"

        # The default
        irb.context.newline_before_multiline_output = true
        out, err = capture_output do
          irb.eval_input
        end
        assert_empty err
        assert_equal("=> \nabc\ndef\n",
                     out)

        # No newline before multiline output
        input.reset
        irb.context.newline_before_multiline_output = false
        out, err = capture_output do
          irb.eval_input
        end
        assert_empty err
        assert_equal("=> abc\ndef\n", out)
      end
    end

    def test_default_return_format
      IRB.conf[:PROMPT][:MY_PROMPT] = {
        :PROMPT_I => "%03n> ",
        :PROMPT_N => "%03n> ",
        :PROMPT_S => "%03n> ",
        :PROMPT_C => "%03n> "
        # without :RETURN
        # :RETURN => "%s\n"
      }
      IRB.conf[:PROMPT_MODE] = :MY_PROMPT
      input = TestInputMethod.new([
        "3"
      ])
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_equal("3\n",
                   out)
    end

    def test_eval_input_with_exception
      pend if RUBY_ENGINE == 'truffleruby'
      verbose, $VERBOSE = $VERBOSE, nil
      input = TestInputMethod.new([
        "def hoge() fuga; end; def fuga() raise; end; hoge\n",
      ])
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      if RUBY_VERSION < '3.0.0' && STDOUT.tty?
        expected = [
          :*, /Traceback \(most recent call last\):\n/,
          :*, /\t 2: from \(irb\):1:in `<main>'\n/,
          :*, /\t 1: from \(irb\):1:in `hoge'\n/,
          :*, /\(irb\):1:in `fuga': unhandled exception\n/,
        ]
      else
        expected = [
          :*, /\(irb\):1:in `fuga': unhandled exception\n/,
          :*, /\tfrom \(irb\):1:in `hoge'\n/,
          :*, /\tfrom \(irb\):1:in `<main>'\n/,
          :*
        ]
      end
      assert_pattern_list(expected, out)
    ensure
      $VERBOSE = verbose
    end

    def test_eval_input_with_invalid_byte_sequence_exception
      verbose, $VERBOSE = $VERBOSE, nil
      input = TestInputMethod.new([
        %Q{def hoge() fuga; end; def fuga() raise "A\\xF3B"; end; hoge\n},
      ])
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      if RUBY_VERSION < '3.0.0' && STDOUT.tty?
        expected = [
          :*, /Traceback \(most recent call last\):\n/,
          :*, /\t 2: from \(irb\):1:in `<main>'\n/,
          :*, /\t 1: from \(irb\):1:in `hoge'\n/,
          :*, /\(irb\):1:in `fuga': A\\xF3B \(RuntimeError\)\n/,
        ]
      else
        expected = [
          :*, /\(irb\):1:in `fuga': A\\xF3B \(RuntimeError\)\n/,
          :*, /\tfrom \(irb\):1:in `hoge'\n/,
          :*, /\tfrom \(irb\):1:in `<main>'\n/,
          :*
        ]
      end
      assert_pattern_list(expected, out)
    ensure
      $VERBOSE = verbose
    end

    def test_eval_input_with_long_exception
      pend if RUBY_ENGINE == 'truffleruby'
      verbose, $VERBOSE = $VERBOSE, nil
      nesting = 20
      generated_code = ''
      nesting.times do |i|
        generated_code << "def a#{i}() a#{i + 1}; end; "
      end
      generated_code << "def a#{nesting}() raise; end; a0\n"
      input = TestInputMethod.new([
        generated_code
      ])
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      if RUBY_VERSION < '3.0.0' && STDOUT.tty?
        expected = [
          :*, /Traceback \(most recent call last\):\n/,
          :*, /\t... \d+ levels...\n/,
          :*, /\t16: from \(irb\):1:in `a4'\n/,
          :*, /\t15: from \(irb\):1:in `a5'\n/,
          :*, /\t14: from \(irb\):1:in `a6'\n/,
          :*, /\t13: from \(irb\):1:in `a7'\n/,
          :*, /\t12: from \(irb\):1:in `a8'\n/,
          :*, /\t11: from \(irb\):1:in `a9'\n/,
          :*, /\t10: from \(irb\):1:in `a10'\n/,
          :*, /\t 9: from \(irb\):1:in `a11'\n/,
          :*, /\t 8: from \(irb\):1:in `a12'\n/,
          :*, /\t 7: from \(irb\):1:in `a13'\n/,
          :*, /\t 6: from \(irb\):1:in `a14'\n/,
          :*, /\t 5: from \(irb\):1:in `a15'\n/,
          :*, /\t 4: from \(irb\):1:in `a16'\n/,
          :*, /\t 3: from \(irb\):1:in `a17'\n/,
          :*, /\t 2: from \(irb\):1:in `a18'\n/,
          :*, /\t 1: from \(irb\):1:in `a19'\n/,
          :*, /\(irb\):1:in `a20': unhandled exception\n/,
        ]
      else
        expected = [
          :*, /\(irb\):1:in `a20': unhandled exception\n/,
          :*, /\tfrom \(irb\):1:in `a19'\n/,
          :*, /\tfrom \(irb\):1:in `a18'\n/,
          :*, /\tfrom \(irb\):1:in `a17'\n/,
          :*, /\tfrom \(irb\):1:in `a16'\n/,
          :*, /\tfrom \(irb\):1:in `a15'\n/,
          :*, /\tfrom \(irb\):1:in `a14'\n/,
          :*, /\tfrom \(irb\):1:in `a13'\n/,
          :*, /\tfrom \(irb\):1:in `a12'\n/,
          :*, /\tfrom \(irb\):1:in `a11'\n/,
          :*, /\tfrom \(irb\):1:in `a10'\n/,
          :*, /\tfrom \(irb\):1:in `a9'\n/,
          :*, /\tfrom \(irb\):1:in `a8'\n/,
          :*, /\tfrom \(irb\):1:in `a7'\n/,
          :*, /\tfrom \(irb\):1:in `a6'\n/,
          :*, /\tfrom \(irb\):1:in `a5'\n/,
          :*, /\tfrom \(irb\):1:in `a4'\n/,
          :*, /\t... \d+ levels...\n/,
        ]
      end
      assert_pattern_list(expected, out)
    ensure
      $VERBOSE = verbose
    end

    def test_prompt_main_escape
      main = Struct.new(:to_s).new("main\a\t\r\n")
      irb = IRB::Irb.new(IRB::WorkSpace.new(main), TestInputMethod.new)
      assert_equal("irb(main    )>", irb.prompt('irb(%m)>', nil, 1, 1))
    end

    def test_prompt_main_inspect_escape
      main = Struct.new(:inspect).new("main\\n\nmain")
      irb = IRB::Irb.new(IRB::WorkSpace.new(main), TestInputMethod.new)
      assert_equal("irb(main\\n main)>", irb.prompt('irb(%M)>', nil, 1, 1))
    end

    def test_prompt_main_truncate
      main = Struct.new(:to_s).new("a" * 100)
      def main.inspect; to_s.inspect; end
      irb = IRB::Irb.new(IRB::WorkSpace.new(main), TestInputMethod.new)
      assert_equal('irb(aaaaaaaaaaaaaaaaaaaaaaaaaaaaa...)>', irb.prompt('irb(%m)>', nil, 1, 1))
      assert_equal('irb("aaaaaaaaaaaaaaaaaaaaaaaaaaaa...)>', irb.prompt('irb(%M)>', nil, 1, 1))
    end

    def test_lineno
      input = TestInputMethod.new([
        "\n",
        "__LINE__\n",
        "__LINE__\n",
        "\n",
        "\n",
        "__LINE__\n",
      ])
      irb = IRB::Irb.new(IRB::WorkSpace.new(Object.new), input)
      out, err = capture_output do
        irb.eval_input
      end
      assert_empty err
      assert_pattern_list([
          :*, /\b2\n/,
          :*, /\b3\n/,
          :*, /\b6\n/,
        ], out)
    end

    private

    def without_colorize
      original_value = IRB.conf[:USE_COLORIZE]
      IRB.conf[:USE_COLORIZE] = false
      yield
    ensure
      IRB.conf[:USE_COLORIZE] = original_value
    end
  end
end