1 files changed, 137 insertions, 0 deletions
diff --git a/spec/features/projects/diffs/diff_show_spec.rb b/spec/features/projects/diffs/diff_show_spec.rb
new file mode 100644
index 00000000000..4baccb24806
--- /dev/null
+++ b/spec/features/projects/diffs/diff_show_spec.rb
@@ -0,0 +1,137 @@
+require 'spec_helper'
+
+feature 'Diff file viewer', :js, feature: true do
+  let(:project) { create(:project, :public, :repository) }
+
+  def visit_commit(sha, anchor: nil)
+    visit project_commit_path(project, sha, anchor: anchor)
+
+    wait_for_requests
+  end
+
+  context 'Ruby file' do
+    before do
+      visit_commit('570e7b2abdd848b95f2f578043fc23bd6f6fd24d')
+    end
+
+    it 'shows highlighted Ruby code' do
+      within('.diff-file[id="2f6fcd96b88b36ce98c38da085c795a27d92a3dd"]') do
+        expect(page).to have_css(".js-syntax-highlight")
+        expect(page).to have_content("def popen(cmd, path=nil)")
+      end
+    end
+  end
+
+  context 'Ruby file (stored in LFS)' do
+    before do
+      project.add_master(project.creator)
+
+      @commit_id = Files::CreateService.new(
+        project,
+        project.creator,
+        start_branch: 'master',
+        branch_name: 'master',
+        commit_message: "Add Ruby file in LFS",
+        file_path: 'files/lfs/ruby.rb',
+        file_content: project.repository.blob_at('master', 'files/lfs/lfs_object.iso').data
+      ).execute[:result]
+    end
+
+    context 'when LFS is enabled on the project' do
+      before do
+        allow(Gitlab.config.lfs).to receive(:enabled).and_return(true)
+        project.update_attribute(:lfs_enabled, true)
+
+        visit_commit(@commit_id)
+      end
+
+      it 'shows an error message' do
+        expect(page).to have_content('This source diff could not be displayed because it is stored in LFS. You can view the blob instead.')
+      end
+    end
+
+    context 'when LFS is disabled on the project' do
+      before do
+        visit_commit(@commit_id)
+      end
+
+      it 'displays the diff' do
+        expect(page).to have_content('size 1575078')
+      end
+    end
+  end
+
+  context 'Image file' do
+    before do
+      visit_commit('2f63565e7aac07bcdadb654e253078b727143ec4')
+    end
+
+    it 'shows a rendered image' do
+      within('.diff-file[id="e986451b8f7397b617dbb6fffcb5539328c56921"]') do
+        expect(page).to have_css('img[alt="files/images/6049019_460s.jpg"]')
+      end
+    end
+  end
+
+  context 'ISO file (stored in LFS)' do
+    context 'when LFS is enabled on the project' do
+      before do
+        allow(Gitlab.config.lfs).to receive(:enabled).and_return(true)
+        project.update_attribute(:lfs_enabled, true)
+
+        visit_commit('048721d90c449b244b7b4c53a9186b04330174ec')
+      end
+
+      it 'shows that file was added' do
+        expect(page).to have_content('File added')
+      end
+    end
+
+    context 'when LFS is disabled on the project' do
+      before do
+        visit_commit('048721d90c449b244b7b4c53a9186b04330174ec')
+      end
+
+      it 'displays the diff' do
+        expect(page).to have_content('size 1575078')
+      end
+    end
+  end
+
+  context 'ZIP file' do
+    before do
+      visit_commit('ae73cb07c9eeaf35924a10f713b364d32b2dd34f')
+    end
+
+    it 'shows that file was added' do
+      expect(page).to have_content('File added')
+    end
+  end
+
+  context 'binary file that appears to be text in the first 1024 bytes' do
+    before do
+      # The file we're visiting is smaller than 10 KB and we want it collapsed
+      # so we need to disable the size increase feature.
+      stub_feature_flags(gitlab_git_diff_size_limit_increase: false)
+
+      visit_commit('7b1cf4336b528e0f3d1d140ee50cafdbc703597c')
+    end
+
+    it 'shows the diff is collapsed' do
+      expect(page).to have_content('This diff is collapsed. Click to expand it.')
+    end
+
+    context 'expanding the diff' do
+      before do
+        # We can't use `click_link` because the "link" doesn't have an `href`.
+        find('a.click-to-expand').click
+
+        wait_for_requests
+      end
+
+      it 'shows there is no preview' do
+        expect(page).to have_content('No preview for this file type')
+      end
+    end
+  end
+end