1 files changed, 86 insertions, 0 deletions
diff --git a/spec/lib/banzai/pipeline/incident_management/timeline_event_pipeline_spec.rb b/spec/lib/banzai/pipeline/incident_management/timeline_event_pipeline_spec.rb
new file mode 100644
index 00000000000..09d2919c6c4
--- /dev/null
+++ b/spec/lib/banzai/pipeline/incident_management/timeline_event_pipeline_spec.rb
@@ -0,0 +1,86 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Banzai::Pipeline::IncidentManagement::TimelineEventPipeline do
+  let_it_be(:project) { create(:project) }
+
+  describe '.filters' do
+    it 'contains required filters' do
+      expect(described_class.filters).to eq(
+        [
+          *Banzai::Pipeline::PlainMarkdownPipeline.filters,
+          *Banzai::Pipeline::GfmPipeline.reference_filters,
+          Banzai::Filter::EmojiFilter,
+          Banzai::Filter::SanitizationFilter,
+          Banzai::Filter::ExternalLinkFilter,
+          Banzai::Filter::ImageLinkFilter
+        ]
+      )
+    end
+  end
+
+  describe '.to_html' do
+    subject(:output) { described_class.to_html(markdown, project: project) }
+
+    context 'when markdown contains font style transformations' do
+      let(:markdown) { '**bold** _italic_ `code`' }
+
+      it { is_expected.to eq('<p><strong>bold</strong> <em>italic</em> <code>code</code></p>') }
+    end
+
+    context 'when markdown contains banned HTML tags' do
+      let(:markdown) { '<div>div</div><h1>h1</h1>' }
+
+      it 'filters out banned tags' do
+        is_expected.to eq(' div  h1 ')
+      end
+    end
+
+    context 'when markdown contains links' do
+      let(:markdown) { '[GitLab](https://gitlab.com)' }
+
+      it do
+        is_expected.to eq(
+          %q(<p><a href="https://gitlab.com" rel="nofollow noreferrer noopener" target="_blank">GitLab</a></p>)
+        )
+      end
+    end
+
+    context 'when markdown contains images' do
+      let(:markdown) { '![Name](/path/to/image.png)' }
+
+      it 'replaces image with a link to the image' do
+        # rubocop:disable Layout/LineLength
+        is_expected.to eq(
+          '<p><a class="with-attachment-icon" href="/path/to/image.png" target="_blank" rel="noopener noreferrer">Name</a></p>'
+        )
+        # rubocop:enable Layout/LineLength
+      end
+    end
+
+    context 'when markdown contains emojis' do
+      let(:markdown) { ':+1:👍' }
+
+      it { is_expected.to eq('<p>👍👍</p>') }
+    end
+
+    context 'when markdown contains a reference to an issue' do
+      let!(:issue) { create(:issue, project: project) }
+      let(:markdown) { "issue ##{issue.iid}" }
+
+      it 'contains a link to the issue' do
+        is_expected.to match(%r(<p>issue <a href="[\w/]+-/issues/#{issue.iid}".*>##{issue.iid}</a></p>))
+      end
+    end
+
+    context 'when markdown contains a reference to a merge request' do
+      let!(:mr) { create(:merge_request, source_project: project, target_project: project) }
+      let(:markdown) { "MR !#{mr.iid}" }
+
+      it 'contains a link to the merge request' do
+        is_expected.to match(%r(<p>MR <a href="[\w/]+-/merge_requests/#{mr.iid}".*>!#{mr.iid}</a></p>))
+      end
+    end
+  end
+end