diff --git a/spec/lib/annotate/annotate_routes_spec.rb b/spec/lib/annotate/annotate_routes_spec.rb
index 26ad4c522..dc4400a35 100644
--- a/spec/lib/annotate/annotate_routes_spec.rb
+++ b/spec/lib/annotate/annotate_routes_spec.rb
@@ -235,6 +235,163 @@
             end
           end
         end
+
+        context 'When the result of `rake routes` contains Rake version' do
+          context 'with older Rake versions' do
+            let :rake_routes_result do
+              <<~EOS.chomp
+                (in /bad/line)
+                good line
+              EOS
+            end
+
+            context 'When the route file does not end with an empty line' do
+              let :route_file_content do
+                <<~EOS.chomp
+                  ActionController::Routing...
+                  foo
+                EOS
+              end
+
+              let :expected_result do
+                <<~EOS
+                  ActionController::Routing...
+                  foo
+
+                  # == Route Map
+                  #
+                  # good line
+                EOS
+              end
+
+              it 'annotates with an empty line' do
+                expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
+                expect(mock_file).to receive(:puts).with(expected_result).once
+                expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
+
+                AnnotateRoutes.do_annotations
+              end
+            end
+
+            context 'When the route file ends with an empty line' do
+              let :route_file_content do
+                <<~EOS
+                  ActionController::Routing...
+                  foo
+                EOS
+              end
+
+              let :expected_result do
+                <<~EOS
+                  ActionController::Routing...
+                  foo
+
+                  # == Route Map
+                  #
+                  # good line
+                EOS
+              end
+
+              it 'annotates without an empty line' do
+                expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
+                expect(mock_file).to receive(:puts).with(expected_result).once
+                expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
+
+                AnnotateRoutes.do_annotations
+              end
+            end
+          end
+
+          context 'with newer Rake versions' do
+            let :rake_routes_result do
+              <<~EOS.chomp
+                another good line
+                good line
+              EOS
+            end
+
+            context 'When the route file does not end with an empty line' do
+              context 'When no option is passed' do
+                let :route_file_content do
+                  <<~EOS.chomp
+                    ActionController::Routing...
+                    foo
+                  EOS
+                end
+
+                let :expected_result do
+                  <<~EOS
+                    ActionController::Routing...
+                    foo
+
+                    # == Route Map
+                    #
+                    # another good line
+                    # good line
+                  EOS
+                end
+
+                it 'annotates with an empty line' do
+                  expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
+                  expect(mock_file).to receive(:puts).with(expected_result).once
+                  expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
+
+                  AnnotateRoutes.do_annotations
+                end
+              end
+            end
+
+            context 'When the route file ends with an empty line' do
+              let :route_file_content do
+                <<~EOS
+                  ActionController::Routing...
+                  foo
+                EOS
+              end
+
+              let :expected_result do
+                <<~EOS
+                  ActionController::Routing...
+                  foo
+
+                  # == Route Map
+                  #
+                  # another good line
+                  # good line
+                EOS
+              end
+
+              it 'annotates without an empty line' do
+                expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
+                expect(mock_file).to receive(:puts).with(expected_result).once
+                expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
+
+                AnnotateRoutes.do_annotations
+              end
+            end
+
+            context 'When option "timestamp" is passed' do
+              let :route_file_content do
+                <<~EOS.chomp
+                  ActionController::Routing...
+                  foo
+                EOS
+              end
+
+              let :expected_result do
+                /ActionController::Routing...\nfoo\n\n# == Route Map \(Updated \d{4}-\d{2}-\d{2} \d{2}:\d{2}\)\n#\n# another good line\n# good line\n/
+              end
+
+              it 'annotates with the timestamp and an empty line' do
+                expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
+                expect(mock_file).to receive(:puts).with(expected_result).once
+                expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
+
+                AnnotateRoutes.do_annotations timestamp: true
+              end
+            end
+          end
+        end
       end
 
       context 'When the result of `rake routes` is blank' do
@@ -401,170 +558,6 @@
     end
   end
 
-  describe 'As for Rake versions' do
-    before :each do
-      expect(File).to receive(:exist?).with(ROUTE_FILE).and_return(true).once
-      expect(File).to receive(:read).with(ROUTE_FILE).and_return(route_file_content).once
-
-      expect(AnnotateRoutes).to receive(:`).with('rake routes').and_return(rake_routes_result).once
-    end
-
-    context 'with older Rake versions' do
-      let :rake_routes_result do
-        <<~EOS.chomp
-          (in /bad/line)
-          good line
-        EOS
-      end
-
-      context 'When the route file does not end with an empty line' do
-        let :route_file_content do
-          <<~EOS.chomp
-            ActionController::Routing...
-            foo
-          EOS
-        end
-
-        let :expected_result do
-          <<~EOS
-            ActionController::Routing...
-            foo
-
-            # == Route Map
-            #
-            # good line
-          EOS
-        end
-
-        it 'annotates with an empty line' do
-          expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
-          expect(mock_file).to receive(:puts).with(expected_result).once
-          expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
-
-          AnnotateRoutes.do_annotations
-        end
-      end
-
-      context 'When the route file ends with an empty line' do
-        let :route_file_content do
-          <<~EOS
-            ActionController::Routing...
-            foo
-          EOS
-        end
-
-        let :expected_result do
-          <<~EOS
-            ActionController::Routing...
-            foo
-
-            # == Route Map
-            #
-            # good line
-          EOS
-        end
-
-        it 'annotates without an empty line' do
-          expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
-          expect(mock_file).to receive(:puts).with(expected_result).once
-          expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
-
-          AnnotateRoutes.do_annotations
-        end
-      end
-    end
-
-    context 'with newer Rake versions' do
-      let :rake_routes_result do
-        <<~EOS.chomp
-          another good line
-          good line
-        EOS
-      end
-
-      context 'When the route file does not end with an empty line' do
-        context 'When no option is passed' do
-          let :route_file_content do
-            <<~EOS.chomp
-              ActionController::Routing...
-              foo
-            EOS
-          end
-
-          let :expected_result do
-            <<~EOS
-              ActionController::Routing...
-              foo
-
-              # == Route Map
-              #
-              # another good line
-              # good line
-            EOS
-          end
-
-          it 'annotates with an empty line' do
-            expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
-            expect(mock_file).to receive(:puts).with(expected_result).once
-            expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
-
-            AnnotateRoutes.do_annotations
-          end
-        end
-      end
-
-      context 'When the route file ends with an empty line' do
-        let :route_file_content do
-          <<~EOS
-            ActionController::Routing...
-            foo
-          EOS
-        end
-
-        let :expected_result do
-          <<~EOS
-            ActionController::Routing...
-            foo
-
-            # == Route Map
-            #
-            # another good line
-            # good line
-          EOS
-        end
-
-        it 'annotates without an empty line' do
-          expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
-          expect(mock_file).to receive(:puts).with(expected_result).once
-          expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
-
-          AnnotateRoutes.do_annotations
-        end
-      end
-
-      context 'When option "timestamp" is passed' do
-        let :route_file_content do
-          <<~EOS.chomp
-            ActionController::Routing...
-            foo
-          EOS
-        end
-
-        let :expected_result do
-          /ActionController::Routing...\nfoo\n\n# == Route Map \(Updated \d{4}-\d{2}-\d{2} \d{2}:\d{2}\)\n#\n# another good line\n# good line\n/
-        end
-
-        it 'annotates with the timestamp and an empty line' do
-          expect(File).to receive(:open).with(ROUTE_FILE, 'wb').and_yield(mock_file).once
-          expect(mock_file).to receive(:puts).with(expected_result).once
-          expect(AnnotateRoutes).to receive(:puts).with(MESSAGE_ANNOTATED).once
-
-          AnnotateRoutes.do_annotations timestamp: true
-        end
-      end
-    end
-  end
-
   describe '.remove_annotations' do
     before :each do
       expect(File).to receive(:exist?).with(ROUTE_FILE).and_return(true).once