chore: fix test error

frontend/app_flowy/packages/flowy_editor/lib/operation/transaction_builder.dart

@@ -30,14 +30,10 @@ class TransactionBuilder {
 
   insertNode(Path path, Node node) {
     insertNodes(path, [node]);
-    // FIXME: Not exactly correct, needs to be customized.
-    afterSelection = Selection.collapsed(
-      Position(path: path, offset: 0),
-    );
   }
 
   insertNodes(Path path, List<Node> nodes) {
-    beforeSelection = state.service.selectionService.currentSelection;
+    beforeSelection = state.cursorSelection;
     add(InsertOperation(path, nodes));
   }
 
@@ -74,7 +70,7 @@ class TransactionBuilder {
   }
 
   textEdit(TextNode node, Delta Function() f) {
-    beforeSelection = state.service.selectionService.currentSelection;
+    beforeSelection = state.cursorSelection;
     final path = node.path;
 
     final delta = f();

frontend/app_flowy/packages/flowy_editor/lib/service/internal_key_event_handlers/enter_in_edge_of_text_node_handler.dart

@@ -4,6 +4,8 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
 import 'package:flowy_editor/document/node.dart';
+import 'package:flowy_editor/document/position.dart';
+import 'package:flowy_editor/document/selection.dart';
 import 'package:flowy_editor/document/text_delta.dart';
 import 'package:flowy_editor/extensions/node_extensions.dart';
 import 'package:flowy_editor/extensions/path_extensions.dart';
@@ -40,6 +42,12 @@ FlowyKeyEventHandler enterInEdgeOfTextNodeHandler = (editorState, event) {
               needCopyAttributes ? {StyleKey.subtype: textNode.subtype} : {},
         ),
       )
+      ..afterSelection = Selection.collapsed(
+        Position(
+          path: textNode.path.next,
+          offset: 0,
+        ),
+      )
       ..commit();
     return KeyEventResult.handled;
   } else if (textNode.selectable!.start() == selection.start) {
@@ -52,6 +60,12 @@ FlowyKeyEventHandler enterInEdgeOfTextNodeHandler = (editorState, event) {
           attributes: {},
         ),
       )
+      ..afterSelection = Selection.collapsed(
+        Position(
+          path: textNode.path.next,
+          offset: 0,
+        ),
+      )
       ..commit();
     return KeyEventResult.handled;
   }

frontend/app_flowy/packages/flowy_editor/test/operation_test.dart

@@ -8,6 +8,7 @@ import 'package:flowy_editor/editor_state.dart';
 import 'package:flowy_editor/document/state_tree.dart';
 
 void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
   group('transform path', () {
     test('transform path changed', () {
       expect(transformPath([0, 1], [0, 1]), [0, 2]);
@@ -87,7 +88,7 @@ void main() {
             "path": [0],
             "nodes": [item1.toJson()],
           }
-        ],
+        ]
       });
     });
     test("delete", () {