1 files changed, 32 insertions, 0 deletions
diff --git a/spec/features/markdown/sandboxed_mermaid_spec.rb b/spec/features/markdown/sandboxed_mermaid_spec.rb
new file mode 100644
index 00000000000..f118fb3db66
--- /dev/null
+++ b/spec/features/markdown/sandboxed_mermaid_spec.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Sandboxed Mermaid rendering', :js do
+  let_it_be(:project) { create(:project, :public) }
+
+  before do
+    stub_feature_flags(sandboxed_mermaid: true)
+  end
+
+  it 'includes mermaid frame correctly' do
+    description = <<~MERMAID
+      ```mermaid
+      graph TD;
+        A-->B;
+        A-->C;
+        B-->D;
+        C-->D;
+      ```
+    MERMAID
+
+    issue = create(:issue, project: project, description: description)
+
+    visit project_issue_path(project, issue)
+
+    wait_for_requests
+
+    expected = %(<iframe src="/-/sandbox/mermaid" sandbox="allow-scripts" frameborder="0" scrolling="no")
+    expect(page.html).to include(expected)
+  end
+end