Add package json_field_editor

packages/json_field_editor/test/src/json_highlight/json_highlight_test.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:json_field_editor/src/json_highlight/json_highlight.dart';
+
+void main() {
+  group('JsonHighlight', () {
+    test(
+      'build method should create TextSpan with correct number of children',
+      () {
+        // Arrange
+        var jsonHighlight = JsonHighlight(isFormating: true);
+        var data =
+            '{"key": "value", "number": 123, "bool": true, "null": null}';
+
+        // Act
+        TextSpan result = jsonHighlight.build(data);
+
+        // Assert
+        expect(
+          result.children!.length,
+          23,
+        ); // adjust this based on your expected result
+      },
+    );
+  });
+}