1 files changed, 36 insertions, 0 deletions
diff --git a/spec/controllers/help_controller_spec.rb b/spec/controllers/help_controller_spec.rb
index 33c75e7584f..d3489324a9c 100644
--- a/spec/controllers/help_controller_spec.rb
+++ b/spec/controllers/help_controller_spec.rb
@@ -7,6 +7,38 @@ describe HelpController do
     sign_in(user)
   end
 
+  describe 'GET #index' do
+    context 'with absolute url' do
+      it 'keeps the URL absolute' do
+        stub_readme("[API](/api/README.md)")
+
+        get :index
+
+        expect(assigns[:help_index]).to eq '[API](/api/README.md)'
+      end
+    end
+
+    context 'with relative url' do
+      it 'prefixes it with /help/' do
+        stub_readme("[API](api/README.md)")
+
+        get :index
+
+        expect(assigns[:help_index]).to eq '[API](/help/api/README.md)'
+      end
+    end
+
+    context 'when url is an external link' do
+      it 'does not change it' do
+        stub_readme("[external](https://some.external.link)")
+
+        get :index
+
+        expect(assigns[:help_index]).to eq '[external](https://some.external.link)'
+      end
+    end
+  end
+
   describe 'GET #show' do
     context 'for Markdown formats' do
       context 'when requested file exists' do
@@ -72,4 +104,8 @@ describe HelpController do
       end
     end
   end
+
+  def stub_readme(content)
+    allow(File).to receive(:read).and_return(content)
+  end
 end