1 files changed, 20 insertions, 0 deletions
diff --git a/spec/features/markdown/mermaid_spec.rb b/spec/features/markdown/mermaid_spec.rb
index 7008b361394..aaaceebc216 100644
--- a/spec/features/markdown/mermaid_spec.rb
+++ b/spec/features/markdown/mermaid_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'spec_helper'
 
 describe 'Mermaid rendering', :js do
@@ -21,4 +23,22 @@ describe 'Mermaid rendering', :js do
       expect(page).to have_selector('svg text', text: label)
     end
   end
+
+  it 'renders linebreaks in Mermaid diagrams' do
+    description = <<~MERMAID
+      ```mermaid
+      graph TD;
+        A(Line 1<br>Line 2)-->B(Line 1<br/>Line 2);
+        C(Line 1<br />Line 2)-->D(Line 1<br  />Line 2);
+      ```
+    MERMAID
+
+    project = create(:project, :public)
+    issue = create(:issue, project: project, description: description)
+
+    visit project_issue_path(project, issue)
+
+    expected = '<text><tspan xml:space="preserve" dy="1em" x="1">Line 1</tspan><tspan xml:space="preserve" dy="1em" x="1">Line 2</tspan></text>'
+    expect(page.html.scan(expected).count).to be(4)
+  end
 end