Added specs for Keyset connenction using LOWER

in GraphQL

spec/lib/gitlab/graphql/connections/keyset/connection_spec.rb

@@ -103,7 +103,75 @@ describe Gitlab::Graphql::Connections::Keyset::Connection do
       end
     end
 
-    context 'when multiple orders are defined' do
+    shared_examples 'nodes are in ascending order' do
+      context 'when no cursor is passed' do
+        let(:arguments) { {} }
+
+        it 'returns projects in ascending order' do
+          expect(subject.sliced_nodes).to eq(ascending_nodes)
+        end
+      end
+
+      context 'when before cursor value is not NULL' do
+        let(:arguments) { { before: encoded_cursor(ascending_nodes[2]) } }
+
+        it 'returns all projects before the cursor' do
+          expect(subject.sliced_nodes).to eq(ascending_nodes.first(2))
+        end
+      end
+
+      context 'when after cursor value is not NULL' do
+        let(:arguments) { { after: encoded_cursor(ascending_nodes[1]) } }
+
+        it 'returns all projects after the cursor' do
+          expect(subject.sliced_nodes).to eq(ascending_nodes.last(3))
+        end
+      end
+
+      context 'when before and after cursor' do
+        let(:arguments) { { before: encoded_cursor(ascending_nodes.last), after: encoded_cursor(ascending_nodes.first) } }
+
+        it 'returns all projects after the cursor' do
+          expect(subject.sliced_nodes).to eq(ascending_nodes[1..3])
+        end
+      end
+    end
+
+    shared_examples 'nodes are in descending order' do
+      context 'when no cursor is passed' do
+        let(:arguments) { {} }
+
+        it 'only returns projects in descending order' do
+          expect(subject.sliced_nodes).to eq(descending_nodes)
+        end
+      end
+
+      context 'when before cursor value is not NULL' do
+        let(:arguments) { { before: encoded_cursor(descending_nodes[2]) } }
+
+        it 'returns all projects before the cursor' do
+          expect(subject.sliced_nodes).to eq(descending_nodes.first(2))
+        end
+      end
+
+      context 'when after cursor value is not NULL' do
+        let(:arguments) { { after: encoded_cursor(descending_nodes[1]) } }
+
+        it 'returns all projects after the cursor' do
+          expect(subject.sliced_nodes).to eq(descending_nodes.last(3))
+        end
+      end
+
+      context 'when before and after cursor' do
+        let(:arguments) { { before: encoded_cursor(descending_nodes.last), after: encoded_cursor(descending_nodes.first) } }
+
+        it 'returns all projects after the cursor' do
+          expect(subject.sliced_nodes).to eq(descending_nodes[1..3])
+        end
+      end
+    end
+
+    context 'when multiple orders with nil values are defined' do
       let!(:project1) { create(:project, last_repository_check_at: 10.days.ago) }    # Asc: project5  Desc: project3
       let!(:project2) { create(:project, last_repository_check_at: nil) }            # Asc: project1  Desc: project1
       let!(:project3) { create(:project, last_repository_check_at: 5.days.ago) }     # Asc: project3  Desc: project5
@@ -114,14 +182,9 @@ describe Gitlab::Graphql::Connections::Keyset::Connection do
         let(:nodes) do
           Project.order(Arel.sql('projects.last_repository_check_at IS NULL')).order(last_repository_check_at: :asc).order(id: :asc)
         end
+        let(:ascending_nodes) { [project5, project1, project3, project2, project4] }
 
-        context 'when no cursor is passed' do
-          let(:arguments) { {} }
-
-          it 'returns projects in ascending order' do
-            expect(subject.sliced_nodes).to eq([project5, project1, project3, project2, project4])
-          end
-        end
+        it_behaves_like 'nodes are in ascending order'
 
         context 'when before cursor value is NULL' do
           let(:arguments) { { before: encoded_cursor(project4) } }
@@ -131,14 +194,6 @@ describe Gitlab::Graphql::Connections::Keyset::Connection do
           end
         end
 
-        context 'when before cursor value is not NULL' do
-          let(:arguments) { { before: encoded_cursor(project3) } }
-
-          it 'returns all projects before the cursor' do
-            expect(subject.sliced_nodes).to eq([project5, project1])
-          end
-        end
-
         context 'when after cursor value is NULL' do
           let(:arguments) { { after: encoded_cursor(project2) } }
 
@@ -146,36 +201,15 @@ describe Gitlab::Graphql::Connections::Keyset::Connection do
             expect(subject.sliced_nodes).to eq([project4])
           end
         end
-
-        context 'when after cursor value is not NULL' do
-          let(:arguments) { { after: encoded_cursor(project1) } }
-
-          it 'returns all projects after the cursor' do
-            expect(subject.sliced_nodes).to eq([project3, project2, project4])
-          end
-        end
-
-        context 'when before and after cursor' do
-          let(:arguments) { { before: encoded_cursor(project4), after: encoded_cursor(project5) } }
-
-          it 'returns all projects after the cursor' do
-            expect(subject.sliced_nodes).to eq([project1, project3, project2])
-          end
-        end
       end
 
       context 'when descending' do
         let(:nodes) do
           Project.order(Arel.sql('projects.last_repository_check_at IS NULL')).order(last_repository_check_at: :desc).order(id: :asc)
         end
+        let(:descending_nodes) { [project3, project1, project5, project2, project4] }
 
-        context 'when no cursor is passed' do
-          let(:arguments) { {} }
-
-          it 'only returns projects in descending order' do
-            expect(subject.sliced_nodes).to eq([project3, project1, project5, project2, project4])
-          end
-        end
+        it_behaves_like 'nodes are in descending order'
 
         context 'when before cursor value is NULL' do
           let(:arguments) { { before: encoded_cursor(project4) } }
@@ -185,14 +219,6 @@ describe Gitlab::Graphql::Connections::Keyset::Connection do
           end
         end
 
-        context 'when before cursor value is not NULL' do
-          let(:arguments) { { before: encoded_cursor(project5) } }
-
-          it 'returns all projects before the cursor' do
-            expect(subject.sliced_nodes).to eq([project3, project1])
-          end
-        end
-
         context 'when after cursor value is NULL' do
           let(:arguments) { { after: encoded_cursor(project2) } }
 
@@ -200,22 +226,32 @@ describe Gitlab::Graphql::Connections::Keyset::Connection do
             expect(subject.sliced_nodes).to eq([project4])
           end
         end
+      end
+    end
 
-        context 'when after cursor value is not NULL' do
-          let(:arguments) { { after: encoded_cursor(project1) } }
+    context 'when ordering uses LOWER' do
+      let!(:project1) { create(:project, name: 'A') } # Asc: project1  Desc: project4
+      let!(:project2) { create(:project, name: 'c') } # Asc: project5  Desc: project2
+      let!(:project3) { create(:project, name: 'b') } # Asc: project3  Desc: project3
+      let!(:project4) { create(:project, name: 'd') } # Asc: project2  Desc: project5
+      let!(:project5) { create(:project, name: 'a') } # Asc: project4  Desc: project1
 
-          it 'returns all projects after the cursor' do
-            expect(subject.sliced_nodes).to eq([project5, project2, project4])
-          end
+      context 'when ascending' do
+        let(:nodes) do
+          Project.order(Arel::Table.new(:projects)['name'].lower.asc).order(id: :asc)
         end
+        let(:ascending_nodes) { [project1, project5, project3, project2, project4] }
 
-        context 'when before and after cursor' do
-          let(:arguments) { { before: encoded_cursor(project4), after: encoded_cursor(project3) } }
+        it_behaves_like 'nodes are in ascending order'
+      end
 
-          it 'returns all projects after the cursor' do
-            expect(subject.sliced_nodes).to eq([project1, project5, project2])
-          end
+      context 'when descending' do
+        let(:nodes) do
+          Project.order(Arel::Table.new(:projects)['name'].lower.desc).order(id: :desc)
         end
+        let(:descending_nodes) { [project4, project2, project3, project5, project1] }
+
+        it_behaves_like 'nodes are in descending order'
       end
     end