1 files changed, 41 insertions, 0 deletions
diff --git a/spec/lib/gitlab/graphql/pagination/keyset/connection_spec.rb b/spec/lib/gitlab/graphql/pagination/keyset/connection_spec.rb
index 0ac54a20fcc..02e67488d3f 100644
--- a/spec/lib/gitlab/graphql/pagination/keyset/connection_spec.rb
+++ b/spec/lib/gitlab/graphql/pagination/keyset/connection_spec.rb
@@ -21,6 +21,47 @@ RSpec.describe Gitlab::Graphql::Pagination::Keyset::Connection do
     Gitlab::Json.parse(Base64Bp.urlsafe_decode64(cursor))
   end
 
+  # see: https://gitlab.com/gitlab-org/gitlab/-/issues/297358
+  context 'the relation has been preloaded' do
+    let(:projects) { Project.all.preload(:issues) }
+    let(:nodes) { projects.first.issues }
+
+    before do
+      project = create(:project)
+      create_list(:issue, 3, project: project)
+    end
+
+    it 'is loaded' do
+      expect(nodes).to be_loaded
+    end
+
+    it 'does not error when accessing pagination information' do
+      connection.first = 2
+
+      expect(connection).to have_attributes(
+        has_previous_page: false,
+        has_next_page: true
+      )
+    end
+
+    it 'can generate cursors' do
+      connection.send(:ordered_items) # necessary to generate the order-list
+
+      expect(connection.cursor_for(nodes.first)).to be_a(String)
+    end
+
+    it 'can read the next page' do
+      connection.send(:ordered_items) # necessary to generate the order-list
+      ordered = nodes.reorder(id: :desc)
+      next_page = described_class.new(nodes,
+                                      context: context,
+                                      max_page_size: 3,
+                                      after: connection.cursor_for(ordered.second))
+
+      expect(next_page.sliced_nodes).to contain_exactly(ordered.third)
+    end
+  end
+
   it_behaves_like 'a connection with collection methods'
 
   it_behaves_like 'a redactable connection' do