Fix missing terms of services link (#35115)

spec/models/terms_of_service_spec.rb

@@ -24,4 +24,55 @@ RSpec.describe TermsOfService do
       expect(subject.pluck(:id)).to match_array(user_before.id)
     end
   end
+
+  describe '::current' do
+    context 'when no terms exist' do
+      it 'returns nil' do
+        expect(described_class.current).to be_nil
+      end
+    end
+
+    context 'when only unpublished terms exist' do
+      before do
+        yesterday = Date.yesterday
+        travel_to yesterday do
+          Fabricate(:terms_of_service, published_at: nil, effective_date: yesterday)
+        end
+        Fabricate(:terms_of_service, published_at: nil, effective_date: Date.tomorrow)
+      end
+
+      it 'returns nil' do
+        expect(described_class.current).to be_nil
+      end
+    end
+
+    context 'when both effective and future terms exist' do
+      let!(:effective_terms) do
+        yesterday = Date.yesterday
+        travel_to yesterday do
+          Fabricate(:terms_of_service, effective_date: yesterday)
+        end
+      end
+
+      before do
+        Fabricate(:terms_of_service, effective_date: Date.tomorrow)
+      end
+
+      it 'returns the effective terms' do
+        expect(described_class.current).to eq effective_terms
+      end
+    end
+
+    context 'when only future terms exist' do
+      let!(:upcoming_terms) { Fabricate(:terms_of_service, effective_date: Date.tomorrow) }
+
+      before do
+        Fabricate(:terms_of_service, effective_date: 10.days.since)
+      end
+
+      it 'returns the terms that are upcoming next' do
+        expect(described_class.current).to eq upcoming_terms
+      end
+    end
+  end
 end