1 files changed, 217 insertions, 0 deletions
diff --git a/spec/features/merge_request/user_sees_versions_spec.rb b/spec/features/merge_request/user_sees_versions_spec.rb
new file mode 100644
index 00000000000..3a15d70979a
--- /dev/null
+++ b/spec/features/merge_request/user_sees_versions_spec.rb
@@ -0,0 +1,217 @@
+require 'rails_helper'
+
+describe 'Merge request > User sees versions', :js do
+  let(:merge_request) { create(:merge_request, importing: true) }
+  let(:project) { merge_request.source_project }
+  let(:user) { project.creator }
+  let!(:merge_request_diff1) { merge_request.merge_request_diffs.create(head_commit_sha: '6f6d7e7ed97bb5f0054f2b1df789b39ca89b6ff9') }
+  let!(:merge_request_diff2) { merge_request.merge_request_diffs.create(head_commit_sha: nil) }
+  let!(:merge_request_diff3) { merge_request.merge_request_diffs.create(head_commit_sha: '5937ac0a7beb003549fc5fd26fc247adbce4a52e') }
+  let!(:params) { {} }
+
+  before do
+    project.add_master(user)
+    sign_in(user)
+    visit diffs_project_merge_request_path(project, merge_request, params)
+  end
+
+  shared_examples 'allows commenting' do |file_id:, line_code:, comment:|
+    it do
+      diff_file_selector = ".diff-file[id='#{file_id}']"
+      line_code = "#{file_id}_#{line_code}"
+
+      page.within(diff_file_selector) do
+        find(".line_holder[id='#{line_code}'] td:nth-of-type(1)").hover
+        find(".line_holder[id='#{line_code}'] button").click
+
+        page.within("form[data-line-code='#{line_code}']") do
+          fill_in "note[note]", with: comment
+          find(".js-comment-button").click
+        end
+
+        wait_for_requests
+
+        expect(page).to have_content(comment)
+      end
+    end
+  end
+
+  describe 'compare with the latest version' do
+    it 'show the latest version of the diff' do
+      page.within '.mr-version-dropdown' do
+        expect(page).to have_content 'latest version'
+      end
+
+      expect(page).to have_content '8 changed files'
+    end
+
+    it_behaves_like 'allows commenting',
+                    file_id: '7445606fbf8f3683cd42bdc54b05d7a0bc2dfc44',
+                    line_code: '1_1',
+                    comment: 'Typo, please fix.'
+  end
+
+  describe 'switch between versions' do
+    before do
+      page.within '.mr-version-dropdown' do
+        find('.btn-default').click
+        click_link 'version 1'
+      end
+
+      # Wait for the page to load
+      page.within '.mr-version-dropdown' do
+        expect(page).to have_content 'version 1'
+      end
+    end
+
+    it 'shows comments that were last relevant at that version' do
+      expect(page).to have_content '5 changed files'
+      expect(page).to have_content 'Not all comments are displayed'
+
+      position = Gitlab::Diff::Position.new(
+        old_path: ".gitmodules",
+        new_path: ".gitmodules",
+        old_line: nil,
+        new_line: 4,
+        diff_refs: merge_request_diff1.diff_refs
+      )
+      outdated_diff_note = create(:diff_note_on_merge_request, project: project, noteable: merge_request, position: position)
+      outdated_diff_note.position = outdated_diff_note.original_position
+      outdated_diff_note.save!
+
+      refresh
+
+      expect(page).to have_css(".diffs .notes[data-discussion-id='#{outdated_diff_note.discussion_id}']")
+    end
+
+    it_behaves_like 'allows commenting',
+                    file_id: '7445606fbf8f3683cd42bdc54b05d7a0bc2dfc44',
+                    line_code: '2_2',
+                    comment: 'Typo, please fix.'
+  end
+
+  describe 'compare with older version' do
+    before do
+      page.within '.mr-version-compare-dropdown' do
+        find('.btn-default').click
+        click_link 'version 1'
+      end
+
+      # Wait for the page to load
+      page.within '.mr-version-compare-dropdown' do
+        expect(page).to have_content 'version 1'
+      end
+    end
+
+    it 'has a path with comparison context and shows comments that were last relevant at that version' do
+      expect(page).to have_current_path diffs_project_merge_request_path(
+        project,
+        merge_request.iid,
+        diff_id: merge_request_diff3.id,
+        start_sha: '6f6d7e7ed97bb5f0054f2b1df789b39ca89b6ff9'
+      )
+      expect(page).to have_content '4 changed files with 15 additions and 6 deletions'
+      expect(page).to have_content 'Not all comments are displayed'
+
+      position = Gitlab::Diff::Position.new(
+        old_path: ".gitmodules",
+        new_path: ".gitmodules",
+        old_line: 4,
+        new_line: 4,
+        diff_refs: merge_request_diff3.compare_with(merge_request_diff1.head_commit_sha).diff_refs
+      )
+      outdated_diff_note = create(:diff_note_on_merge_request, project: project, noteable: merge_request, position: position)
+      outdated_diff_note.position = outdated_diff_note.original_position
+      outdated_diff_note.save!
+
+      refresh
+      wait_for_requests
+
+      expect(page).to have_css(".diffs .notes[data-discussion-id='#{outdated_diff_note.discussion_id}']")
+    end
+
+    it 'show diff between new and old version' do
+      expect(page).to have_content '4 changed files with 15 additions and 6 deletions'
+    end
+
+    it 'returns to latest version when "Show latest version" button is clicked' do
+      click_link 'Show latest version'
+      page.within '.mr-version-dropdown' do
+        expect(page).to have_content 'latest version'
+      end
+      expect(page).to have_content '8 changed files'
+    end
+
+    it_behaves_like 'allows commenting',
+                    file_id: '7445606fbf8f3683cd42bdc54b05d7a0bc2dfc44',
+                    line_code: '4_4',
+                    comment: 'Typo, please fix.'
+  end
+
+  describe 'compare with same version' do
+    before do
+      page.within '.mr-version-compare-dropdown' do
+        find('.btn-default').click
+        click_link 'version 1'
+      end
+    end
+
+    it 'has 0 chages between versions' do
+      page.within '.mr-version-compare-dropdown' do
+        expect(find('.dropdown-toggle')).to have_content 'version 1'
+      end
+
+      page.within '.mr-version-dropdown' do
+        find('.btn-default').click
+        click_link 'version 1'
+      end
+      expect(page).to have_content '0 changed files'
+    end
+  end
+
+  describe 'compare with newer version' do
+    before do
+      page.within '.mr-version-compare-dropdown' do
+        find('.btn-default').click
+        click_link 'version 2'
+      end
+    end
+
+    it 'sets the compared versions to be the same' do
+      page.within '.mr-version-compare-dropdown' do
+        expect(find('.dropdown-toggle')).to have_content 'version 2'
+      end
+
+      page.within '.mr-version-dropdown' do
+        find('.btn-default').click
+        click_link 'version 1'
+      end
+
+      page.within '.mr-version-compare-dropdown' do
+        expect(page).to have_content 'version 1'
+      end
+
+      expect(page).to have_content '0 changed files'
+    end
+  end
+
+  describe 'scoped in a commit' do
+    let(:params) { { commit_id: '570e7b2abdd848b95f2f578043fc23bd6f6fd24d' } }
+
+    before do
+      wait_for_requests
+    end
+
+    it 'should only show diffs from the commit' do
+      diff_commit_ids = find_all('.diff-file [data-commit-id]').map {|diff| diff['data-commit-id']}
+
+      expect(diff_commit_ids).not_to be_empty
+      expect(diff_commit_ids).to all(eq(params[:commit_id]))
+    end
+
+    it_behaves_like 'allows commenting',
+                    file_id: '2f6fcd96b88b36ce98c38da085c795a27d92a3dd',
+                    line_code: '6_6',
+                    comment: 'Typo, please fix.'
+  end
+end