summaryrefslogtreecommitdiff
path: root/spec/models/wiki_page_spec.rb
blob: 579a9e664cfbb36a8dfc34cd82a1f32ad57f5459 (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
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
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
# frozen_string_literal: true

require "spec_helper"

RSpec.describe WikiPage do
  let_it_be(:user) { create(:user) }
  let_it_be(:container) { create(:project) }

  def create_wiki_page(attrs = {})
    page = build_wiki_page(attrs)

    page.create(message: (attrs[:message] || 'test commit'))

    container.wiki.find_page(page.slug)
  end

  def build_wiki_page(attrs = {})
    wiki_page_attrs = { container: container, content: 'test content' }.merge(attrs)

    build(:wiki_page, wiki_page_attrs)
  end

  def wiki
    container.wiki
  end

  def disable_front_matter
    stub_feature_flags(Gitlab::WikiPages::FrontMatterParser::FEATURE_FLAG => false)
  end

  def enable_front_matter_for(thing)
    stub_feature_flags(Gitlab::WikiPages::FrontMatterParser::FEATURE_FLAG => thing)
  end

  # Use for groups of tests that do not modify their `subject`.
  #
  #   include_context 'subject is persisted page', title: 'my title'
  shared_context 'subject is persisted page' do |attrs = {}|
    let_it_be(:persisted_page) { create_wiki_page(attrs) }

    subject { persisted_page }
  end

  describe '#front_matter' do
    let(:wiki_page) { create(:wiki_page, container: container, content: content) }

    shared_examples 'a page without front-matter' do
      it { expect(wiki_page).to have_attributes(front_matter: {}, content: content) }
    end

    shared_examples 'a page with front-matter' do
      let(:front_matter) { { title: 'Foo', slugs: %w[slug_a slug_b] } }

      it { expect(wiki_page.front_matter).to eq(front_matter) }
    end

    context 'the wiki page has front matter' do
      let(:content) do
        <<~MD
        ---
        title: Foo
        slugs:
          - slug_a
          - slug_b
        ---

        My actual content
        MD
      end

      it_behaves_like 'a page with front-matter'

      it 'strips the front matter from the content' do
        expect(wiki_page.content.strip).to eq('My actual content')
      end

      context 'the feature flag is off' do
        before do
          disable_front_matter
        end

        it_behaves_like 'a page without front-matter'

        context 'but enabled for the container' do
          before do
            enable_front_matter_for(container)
          end

          it_behaves_like 'a page with front-matter'
        end
      end
    end

    context 'the wiki page does not have front matter' do
      let(:content) { 'My actual content' }

      it_behaves_like 'a page without front-matter'
    end

    context 'the wiki page has fenced blocks, but nothing in them' do
      let(:content) do
        <<~MD
        ---
        ---

        My actual content
        MD
      end

      it_behaves_like 'a page without front-matter'
    end

    context 'the wiki page has invalid YAML type in fenced blocks' do
      let(:content) do
        <<~MD
        ---
        this isn't YAML
        ---

        My actual content
        MD
      end

      it_behaves_like 'a page without front-matter'
    end

    context 'the wiki page has a disallowed class in fenced block' do
      let(:content) do
        <<~MD
        ---
        date: 2010-02-11 11:02:57
        ---

        My actual content
        MD
      end

      it_behaves_like 'a page without front-matter'
    end

    context 'the wiki page has invalid YAML in fenced block' do
      let(:content) do
        <<~MD
        ---
        invalid-use-of-reserved-indicator: @text
        ---

        My actual content
        MD
      end

      it_behaves_like 'a page without front-matter'
    end
  end

  describe '.unhyphenize' do
    it 'removes hyphens from a name' do
      name = 'a-name--with-hyphens'

      expect(described_class.unhyphenize(name)).to eq('a name with hyphens')
    end
  end

  describe "#initialize" do
    context "when initialized with an existing page" do
      include_context 'subject is persisted page', title: 'test initialization'

      it "sets the slug attribute" do
        expect(subject.slug).to eq("test-initialization")
      end

      it "sets the title attribute" do
        expect(subject.title).to eq("test initialization")
      end

      it "sets the formatted content attribute" do
        expect(subject.content).to eq("test content")
      end

      it "sets the format attribute" do
        expect(subject.format).to eq(:markdown)
      end

      it "sets the message attribute" do
        expect(subject.message).to eq("test commit")
      end

      it "sets the version attribute" do
        expect(subject.version).to be_a Gitlab::Git::WikiPageVersion
      end
    end
  end

  describe "validations" do
    subject { build_wiki_page }

    it "validates presence of title" do
      subject.attributes.delete(:title)

      expect(subject).not_to be_valid
      expect(subject.errors.messages).to eq(title: ["can't be blank"])
    end

    it "validates presence of content" do
      subject.attributes.delete(:content)

      expect(subject).not_to be_valid
      expect(subject.errors.messages).to eq(content: ["can't be blank"])
    end

    describe '#validate_content_size_limit' do
      context 'with a new page' do
        before do
          stub_application_setting(wiki_page_max_content_bytes: 10)
        end

        it 'accepts content below the limit' do
          subject.attributes[:content] = 'a' * 10

          expect(subject).to be_valid
        end

        it 'rejects content exceeding the limit' do
          subject.attributes[:content] = 'a' * 11

          expect(subject).not_to be_valid
          expect(subject.errors.messages).to eq(
            content: ['is too long (11 Bytes). The maximum size is 10 Bytes.']
          )
        end

        it 'counts content size in bytes rather than characters' do
          subject.attributes[:content] = '๐Ÿ’ฉ๐Ÿ’ฉ๐Ÿ’ฉ'

          expect(subject).not_to be_valid
          expect(subject.errors.messages).to eq(
            content: ['is too long (12 Bytes). The maximum size is 10 Bytes.']
          )
        end
      end

      context 'with an existing page exceeding the limit' do
        include_context 'subject is persisted page'

        before do
          subject
          stub_application_setting(wiki_page_max_content_bytes: 11)
        end

        it 'accepts content when it has not changed' do
          expect(subject).to be_valid
        end

        it 'rejects content when it has changed' do
          subject.attributes[:content] = 'a' * 12

          expect(subject).not_to be_valid
          expect(subject.errors.messages).to eq(
            content: ['is too long (12 Bytes). The maximum size is 11 Bytes.']
          )
        end
      end
    end

    describe '#validate_path_limits' do
      let(:max_title) { Gitlab::WikiPages::MAX_TITLE_BYTES }
      let(:max_directory) { Gitlab::WikiPages::MAX_DIRECTORY_BYTES }

      where(:character) do
        ['a', 'รค', '๐Ÿ™ˆ']
      end

      with_them do
        let(:size) { character.bytesize.to_f }
        let(:valid_title) { character * (max_title / size).floor }
        let(:valid_directory) { character * (max_directory / size).floor }
        let(:invalid_title) { character * ((max_title + 1) / size).ceil }
        let(:invalid_directory) { character * ((max_directory + 1) / size).ceil }

        it 'accepts page titles below the limit' do
          subject.title = valid_title

          expect(subject).to be_valid
        end

        it 'accepts directories below the limit' do
          subject.title = valid_directory + '/foo'

          expect(subject).to be_valid
        end

        it 'accepts a path with page title and directory below the limit' do
          subject.title = "#{valid_directory}/#{valid_title}"

          expect(subject).to be_valid
        end

        it 'rejects page titles exceeding the limit' do
          subject.title = invalid_title

          expect(subject).not_to be_valid
          expect(subject.errors[:title]).to contain_exactly(
            "exceeds the limit of #{max_title} bytes"
          )
        end

        it 'rejects directories exceeding the limit' do
          subject.title = "#{invalid_directory}/#{invalid_directory}2/foo"

          expect(subject).not_to be_valid
          expect(subject.errors[:title]).to contain_exactly(
            "exceeds the limit of #{max_directory} bytes for directory name \"#{invalid_directory}\"",
            "exceeds the limit of #{max_directory} bytes for directory name \"#{invalid_directory}2\""
          )
        end

        it 'rejects a page with both title and directory exceeding the limit' do
          subject.title = "#{invalid_directory}/#{invalid_title}"

          expect(subject).not_to be_valid
          expect(subject.errors[:title]).to contain_exactly(
            "exceeds the limit of #{max_title} bytes",
            "exceeds the limit of #{max_directory} bytes for directory name \"#{invalid_directory}\""
          )
        end
      end

      context 'with an existing page title exceeding the limit' do
        subject do
          title = 'a' * (max_title + 1)
          wiki.create_page(title, 'content')
          wiki.find_page(title)
        end

        it 'accepts the exceeding title length when unchanged' do
          expect(subject).to be_valid
        end

        it 'rejects the exceeding title length when changed' do
          subject.title = 'b' * (max_title + 1)

          expect(subject).not_to be_valid
          expect(subject.errors).to include(:title)
        end
      end
    end
  end

  describe "#create" do
    let(:attributes) do
      {
        title: SecureRandom.hex,
        content: "Home Page",
        format: "markdown",
        message: 'Custom Commit Message'
      }
    end

    let(:title) { attributes[:title] }

    subject { build_wiki_page }

    context "with valid attributes" do
      it "saves the wiki page" do
        subject.create(attributes)

        expect(wiki.find_page(title)).not_to be_nil
      end

      it "returns true" do
        expect(subject.create(attributes)).to eq(true)
      end

      it 'saves the wiki page with message' do
        subject.create(attributes)

        expect(wiki.find_page(title).message).to eq 'Custom Commit Message'
      end

      it 'if the title is preceded by a / it is removed' do
        subject.create(attributes.merge(title: '/New Page'))

        expect(wiki.find_page('New Page')).not_to be_nil
      end
    end

    context "with invalid attributes" do
      it 'does not create the page' do
        expect { subject.create(title: '') }.not_to change { wiki.list_pages.length }
      end
    end
  end

  describe "dot in the title" do
    let(:title) { 'Index v1.2.3' }

    describe "#create" do
      subject { build_wiki_page }

      it "saves the wiki page and returns true", :aggregate_failures do
        attributes = { title: title, content: "Home Page", format: "markdown" }

        expect(subject.create(attributes)).to eq(true)
        expect(wiki.find_page(title)).not_to be_nil
      end
    end

    describe '#update' do
      subject { create_wiki_page(title: title) }

      it 'updates the content of the page and returns true', :aggregate_failures do
        expect(subject.update(content: 'new content')).to be_truthy

        page = wiki.find_page(title)

        expect([subject.content, page.content]).to all(eq('new content'))
      end
    end
  end

  describe "#update" do
    let!(:original_title) { subject.title }

    subject { create_wiki_page }

    context "with valid attributes" do
      it "updates the content of the page" do
        new_content = "new content"

        subject.update(content: new_content)
        page = wiki.find_page(original_title)

        expect([subject.content, page.content]).to all(eq("new content"))
      end

      it "updates the title of the page" do
        new_title = "Index v.1.2.4"

        subject.update(title: new_title)
        page = wiki.find_page(new_title)

        expect([subject.title, page.title]).to all(eq(new_title))
      end

      describe 'updating front_matter' do
        shared_examples 'able to update front-matter' do
          it 'updates the wiki-page front-matter' do
            content = subject.content
            subject.update(front_matter: { slugs: ['x'] })
            page = wiki.find_page(original_title)

            expect([subject, page]).to all(
              have_attributes(
                front_matter: include(slugs: include('x')),
                content: content
              ))
          end
        end

        it_behaves_like 'able to update front-matter'

        context 'the front matter is too long' do
          let(:new_front_matter) do
            {
              title: generate(:wiki_page_title),
              slugs: Array.new(51).map { FFaker::Lorem.characters(512) }
            }
          end

          it 'raises an error' do
            expect { subject.update(front_matter: new_front_matter) }.to raise_error(described_class::FrontMatterTooLong)
          end
        end

        context 'the front-matter feature flag is not enabled' do
          before do
            disable_front_matter
          end

          it 'does not update the front-matter' do
            content = subject.content
            subject.update(front_matter: { slugs: ['x'] })

            page = wiki.find_page(subject.title)

            expect([subject, page]).to all(have_attributes(front_matter: be_empty, content: content))
          end

          context 'but it is enabled for the container' do
            before do
              enable_front_matter_for(container)
            end

            it_behaves_like 'able to update front-matter'
          end
        end

        it 'updates the wiki-page front-matter and content together' do
          content = 'totally new content'
          subject.update(content: content, front_matter: { slugs: ['x'] })
          page = wiki.find_page(original_title)

          expect([subject, page]).to all(
            have_attributes(
              front_matter: include(slugs: include('x')),
              content: content
            ))
        end
      end

      it "returns true" do
        expect(subject.update(content: "more content")).to be_truthy
      end
    end

    context 'with same last commit sha' do
      it 'returns true' do
        expect(subject.update(content: 'more content', last_commit_sha: subject.last_commit_sha)).to be_truthy
      end
    end

    context 'with different last commit sha' do
      it 'raises exception' do
        expect { subject.update(content: 'more content', last_commit_sha: 'xxx') }.to raise_error(WikiPage::PageChangedError)
      end
    end

    context 'when renaming a page' do
      it 'raises an error if the page already exists' do
        existing_page = create_wiki_page

        expect { subject.update(title: existing_page.title, content: 'new_content') }.to raise_error(WikiPage::PageRenameError)
        expect(subject.title).to eq original_title
        expect(subject.content).to eq 'new_content' # We don't revert the content
      end

      it 'updates the content and rename the file' do
        new_title = 'Renamed Page'
        new_content = 'updated content'

        expect(subject.update(title: new_title, content: new_content)).to be_truthy

        page = wiki.find_page(new_title)

        expect(page).not_to be_nil
        expect(page.content).to eq new_content
      end
    end

    context 'when moving a page' do
      it 'raises an error if the page already exists' do
        wiki.create_page('foo/Existing Page', 'content')

        expect { subject.update(title: 'foo/Existing Page', content: 'new_content') }.to raise_error(WikiPage::PageRenameError)
        expect(subject.title).to eq original_title
        expect(subject.content).to eq 'new_content'
      end

      it 'updates the content and moves the file' do
        new_title = 'foo/Other Page'
        new_content = 'new_content'

        expect(subject.update(title: new_title, content: new_content)).to be_truthy

        page = wiki.find_page(new_title)

        expect(page).not_to be_nil
        expect(page.content).to eq new_content
      end

      describe 'in subdir' do
        it 'moves the page to the root folder if the title is preceded by /' do
          page = create_wiki_page(title: 'foo/Existing Page')

          expect(page.slug).to eq 'foo/Existing-Page'
          expect(page.update(title: '/Existing Page', content: 'new_content')).to be_truthy
          expect(page.slug).to eq 'Existing-Page'
        end

        it 'does nothing if it has the same title' do
          page = create_wiki_page(title: 'foo/Another Existing Page')

          original_path = page.slug

          expect(page.update(title: 'Another Existing Page', content: 'new_content')).to be_truthy
          expect(page.slug).to eq original_path
        end
      end

      context 'in root dir' do
        it 'does nothing if the title is preceded by /' do
          original_path = subject.slug

          expect(subject.update(title: "/#{subject.title}", content: 'new_content')).to be_truthy
          expect(subject.slug).to eq original_path
        end
      end
    end

    context "with invalid attributes" do
      it 'aborts update if title blank' do
        expect(subject.update(title: '', content: 'new_content')).to be_falsey
        expect(subject.content).to eq 'new_content'

        page = wiki.find_page(original_title)

        expect(page.content).to eq 'test content'
      end
    end
  end

  describe "#delete" do
    it "deletes the page and returns true", :aggregate_failures do
      page = create_wiki_page

      expect do
        expect(page.delete).to eq(true)
      end.to change { wiki.list_pages.length }.by(-1)
    end
  end

  describe "#versions" do
    let(:subject) { create_wiki_page }

    it "returns an array of all commits for the page" do
      expect do
        3.times { |i| subject.update(content: "content #{i}") }
      end.to change { subject.versions.count }.by(3)
    end
  end

  describe '#title_changed?' do
    using RSpec::Parameterized::TableSyntax

    let_it_be(:unsaved_page) { build_wiki_page(title: 'test page') }
    let_it_be(:existing_page) { create_wiki_page(title: 'test page') }
    let_it_be(:directory_page) { create_wiki_page(title: 'parent directory/child page') }
    let_it_be(:page_with_special_characters) { create_wiki_page(title: 'test+page') }

    let(:untitled_page) { described_class.new(wiki) }

    where(:page, :title, :changed) do
      :untitled_page  | nil                             | false
      :untitled_page  | 'new title'                     | true

      :unsaved_page   | nil                             | true
      :unsaved_page   | 'test page'                     | true
      :unsaved_page   | 'test-page'                     | true
      :unsaved_page   | 'test+page'                     | true
      :unsaved_page   | 'new title'                     | true

      :existing_page  | nil                             | false
      :existing_page  | 'test page'                     | false
      :existing_page  | 'test-page'                     | false
      :existing_page  | '/test page'                    | false
      :existing_page  | '/test-page'                    | false
      :existing_page  | 'test+page'                     | true
      :existing_page  | ' test page '                   | true
      :existing_page  | 'new title'                     | true
      :existing_page  | 'new-title'                     | true

      :directory_page | nil                             | false
      :directory_page | 'parent directory/child page'   | false
      :directory_page | 'parent-directory/child page'   | false
      :directory_page | 'parent-directory/child-page'   | false
      :directory_page | 'child page'                    | false
      :directory_page | 'child-page'                    | false
      :directory_page | '/child page'                   | true
      :directory_page | 'parent directory/other'        | true
      :directory_page | 'parent-directory/other'        | true
      :directory_page | 'parent-directory / child-page' | true
      :directory_page | 'other directory/child page'    | true
      :directory_page | 'other-directory/child page'    | true

      :page_with_special_characters | nil               | false
      :page_with_special_characters | 'test+page'       | false
      :page_with_special_characters | 'test-page'       | true
      :page_with_special_characters | 'test page'       | true
    end

    with_them do
      it 'returns the expected value' do
        subject = public_send(page)
        subject.title = title if title

        expect(subject.title_changed?).to be(changed)
      end
    end
  end

  describe '#content_changed?' do
    context 'with a new page' do
      subject { build_wiki_page }

      it 'returns true if content is set' do
        subject.attributes[:content] = 'new'

        expect(subject.content_changed?).to be(true)
      end

      it 'returns false if content is blank' do
        subject.attributes[:content] = ' '

        expect(subject.content_changed?).to be(false)
      end
    end

    context 'with an existing page' do
      include_context 'subject is persisted page'

      it 'returns false' do
        expect(subject.content_changed?).to be(false)
      end

      it 'returns false if content is set to the same value' do
        subject.attributes[:content] = 'test content'

        expect(subject.content_changed?).to be(false)
      end

      it 'returns true if content is changed' do
        subject.attributes[:content] = 'new'

        expect(subject.content_changed?).to be(true)
      end

      it 'returns true if content is changed to a blank string' do
        subject.attributes[:content] = ' '

        expect(subject.content_changed?).to be(true)
      end

      it 'returns false if only the newline format has changed' do
        expect(subject.page).to receive(:text_data).and_return("foo\nbar")

        subject.attributes[:content] = "foo\r\nbar"

        expect(subject.content_changed?).to be(false)
      end
    end
  end

  describe '#path' do
    it 'returns the path when persisted' do
      existing_page = create_wiki_page(title: 'path test')

      expect(existing_page.path).to eq('path-test.md')
    end

    it 'returns nil when not persisted' do
      unsaved_page = build_wiki_page(title: 'path test')

      expect(unsaved_page.path).to be_nil
    end
  end

  describe '#directory' do
    context 'when the page is at the root directory' do
      include_context 'subject is persisted page', title: 'directory test'

      it 'returns an empty string' do
        expect(subject.directory).to eq('')
      end
    end

    context 'when the page is inside an actual directory' do
      include_context 'subject is persisted page', title: 'dir_1/dir_1_1/directory test'

      it 'returns the full directory hierarchy' do
        expect(subject.directory).to eq('dir_1/dir_1_1')
      end
    end
  end

  describe '#historical?' do
    let!(:container) { create(:project) }

    subject { create_wiki_page }

    let(:wiki) { subject.wiki }
    let(:old_version) { subject.versions.last.id }
    let(:old_page) { wiki.find_page(subject.title, old_version) }
    let(:latest_version) { subject.versions.first.id }
    let(:latest_page) { wiki.find_page(subject.title, latest_version) }

    before do
      3.times { |i| subject.update(content: "content #{i}") }
    end

    it 'returns true when requesting an old version' do
      expect(old_page.historical?).to be_truthy
    end

    it 'returns false when requesting latest version' do
      expect(latest_page.historical?).to be_falsy
    end

    it 'returns false when version is nil' do
      expect(latest_page).to receive(:version) { nil }

      expect(latest_page.historical?).to be_falsy
    end

    it 'returns false when the last version is nil' do
      expect(old_page).to receive(:last_version) { nil }

      expect(old_page.historical?).to be_falsy
    end

    it 'returns false when the version is nil' do
      expect(old_page).to receive(:version) { nil }

      expect(old_page.historical?).to be_falsy
    end
  end

  describe '#persisted?' do
    it 'returns true for a persisted page' do
      expect(create_wiki_page).to be_persisted
    end

    it 'returns false for an unpersisted page' do
      expect(build_wiki_page).not_to be_persisted
    end
  end

  describe '#to_partial_path' do
    it 'returns the relative path to the partial to be used' do
      expect(build_wiki_page.to_partial_path).to eq('../shared/wikis/wiki_page')
    end
  end

  describe '#==' do
    include_context 'subject is persisted page'

    it 'returns true for identical wiki page' do
      expect(subject).to eq(subject)
    end

    it 'returns true for updated wiki page' do
      subject.update(content: "Updated content")
      updated_page = wiki.find_page(subject.slug)

      expect(updated_page).not_to be_nil
      expect(updated_page).to eq(subject)
    end

    it 'returns false for a completely different wiki page' do
      other_page = create(:wiki_page)

      expect(subject.slug).not_to eq(other_page.slug)
      expect(subject.container).not_to eq(other_page.container)
      expect(subject).not_to eq(other_page)
    end

    it 'returns false for page with different slug on same container' do
      other_page = create_wiki_page

      expect(subject.slug).not_to eq(other_page.slug)
      expect(subject.container).to eq(other_page.container)
      expect(subject).not_to eq(other_page)
    end

    it 'returns false for page with the same slug on a different container' do
      other_page = create(:wiki_page, title: subject.slug)

      expect(subject.slug).to eq(other_page.slug)
      expect(subject.container).not_to eq(other_page.container)
      expect(subject).not_to eq(other_page)
    end
  end

  describe '#last_commit_sha' do
    include_context 'subject is persisted page'

    it 'returns commit sha' do
      expect(subject.last_commit_sha).to eq subject.last_version.sha
    end

    it 'is changed after page updated' do
      last_commit_sha_before_update = subject.last_commit_sha

      subject.update(content: "new content")
      page = wiki.find_page(subject.title)

      expect(page.last_commit_sha).not_to eq last_commit_sha_before_update
    end
  end

  describe '#hook_attrs' do
    subject { build_wiki_page }

    it 'adds absolute urls for images in the content' do
      subject.attributes[:content] = 'test![WikiPage_Image](/uploads/abc/WikiPage_Image.png)'

      expect(subject.hook_attrs['content']).to eq("test![WikiPage_Image](#{Settings.gitlab.url}/uploads/abc/WikiPage_Image.png)")
    end
  end

  describe '#version_commit_timestamp' do
    context 'for a new page' do
      it 'returns nil' do
        expect(build_wiki_page.version_commit_timestamp).to be_nil
      end
    end

    context 'for page that exists' do
      it 'returns the timestamp of the commit' do
        existing_page = create_wiki_page

        expect(existing_page.version_commit_timestamp).to eq(existing_page.version.commit.committed_date)
      end
    end
  end

  describe '#diffs' do
    include_context 'subject is persisted page'

    it 'returns a diff instance' do
      diffs = subject.diffs(foo: 'bar')

      expect(diffs).to be_a(Gitlab::Diff::FileCollection::WikiPage)
      expect(diffs.diffable).to be_a(Commit)
      expect(diffs.diffable.id).to eq(subject.version.id)
      expect(diffs.project).to be(subject.wiki)
      expect(diffs.diff_options).to include(
        expanded: true,
        paths: [subject.path],
        foo: 'bar'
      )
    end
  end
end