diff --git a/.forgejo/workflows/ci.yml b/.forgejo/workflows/ci.yml
index f5a8e92..2adef42 100644
--- a/.forgejo/workflows/ci.yml
+++ b/.forgejo/workflows/ci.yml
@@ -28,6 +28,13 @@ jobs:
           git remote add origin "http://x-access-token:${TOKEN}@forgejo:3000/${GITHUB_REPOSITORY}.git"
           git fetch -q --depth 1 origin "${GITHUB_SHA}"
           git checkout -q FETCH_HEAD
+      # private-settings*.json están en .gitignore (llevan DSN y claves), pero
+      # pubspec.yaml los declara como assets y `flutter analyze` los exige.
+      # Aquí basta con que existan: analyze no mira el contenido.
+      - name: Placeholders de private-settings
+        run: |
+          echo '{}' > assets/private-settings.json
+          echo '{}' > assets/private-settings-dev.json
       - run: flutter pub get
       - name: Generate code (json_serializable)
         run: dart run build_runner build --delete-conflicting-outputs
@@ -47,6 +54,10 @@ jobs:
           git remote add origin "http://x-access-token:${TOKEN}@forgejo:3000/${GITHUB_REPOSITORY}.git"
           git fetch -q --depth 1 origin "${GITHUB_SHA}"
           git checkout -q FETCH_HEAD
+      - name: Placeholders de private-settings
+        run: |
+          echo '{}' > assets/private-settings.json
+          echo '{}' > assets/private-settings-dev.json
       - run: flutter pub get
       - name: Generate code + test
         run: |
diff --git a/lib/file_utils.dart b/lib/file_utils.dart
index dddadc6..1153de7 100644
--- a/lib/file_utils.dart
+++ b/lib/file_utils.dart
@@ -1,6 +1,6 @@
 import 'dart:async';
 
-import 'package:flutter/services.dart' show rootBundle;
+import 'package:flutter/services.dart' show AssetBundle, rootBundle;
 
 final RegExp esRegExp = RegExp('^es-');
 
@@ -20,13 +20,15 @@ Future<String> getFileNameOfLang(
     {required String dir,
     required String fileName,
     required String ext,
-    required String lang}) async {
+    required String lang,
+    // Inyectable para poder probarlo sin depender del bundle real.
+    AssetBundle? bundle}) async {
   final String base = '$dir/$fileName';
   final String fallback = getFallbackLang(lang);
   String file = '$base-$lang.$ext';
-  if (await assetNotExists(file)) {
+  if (await assetNotExists(file, bundle)) {
     file = '$base-$fallback.$ext';
-    if (await assetNotExists(file)) {
+    if (await assetNotExists(file, bundle)) {
       file = '$base.$ext';
     }
   }
@@ -34,8 +36,8 @@ Future<String> getFileNameOfLang(
 }
 
 // https://github.com/flutter/flutter/issues/15325
-Future<bool> assetNotExists(String asset) {
-  return rootBundle
+Future<bool> assetNotExists(String asset, [AssetBundle? bundle]) {
+  return (bundle ?? rootBundle)
       .load(asset)
       .then((_) => false)
       .catchError((Object err, StackTrace stack) {
diff --git a/pubspec.yaml b/pubspec.yaml
index aaf3d51..1213681 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,7 +5,9 @@ description: All Against Fire
 version: 1.10.0+10
 
 environment:
-  sdk: ">=3.5.0 <4.0.0"
+  # 3.8 es lo que piden los generadores de código actuales (build_runner avisa
+  # "does not match the required range ^3.8.0" con una cota más baja).
+  sdk: ">=3.8.0 <4.0.0"
 
 dependencies:
   flutter:
diff --git a/test/file_test.dart b/test/file_test.dart
index d42e4f9..9dbd35c 100644
--- a/test/file_test.dart
+++ b/test/file_test.dart
@@ -1,5 +1,25 @@
+import 'dart:convert';
+
 import 'package:fires_flutter/file_utils.dart';
-import 'package:test/test.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+/// Bundle de mentira: solo "existen" los assets que se le pasan. Evita depender
+/// del bundle real, que en un test unitario no responde.
+class _FakeBundle extends CachingAssetBundle {
+  _FakeBundle(this.present);
+
+  final Set<String> present;
+
+  @override
+  Future<ByteData> load(String key) async {
+    if (!present.contains(key)) {
+      throw FlutterError('Unable to load asset: $key');
+    }
+    return ByteData.sublistView(Uint8List.fromList(utf8.encode('x')));
+  }
+}
 
 void main() {
   test('test es-ES fallback', () {
@@ -24,7 +44,31 @@ void main() {
 
   test('test privacy English md page', () async {
     final String answer = await getFileNameOfLang(
-        dir: 'assets/pages', fileName: 'privacy', ext: 'md', lang: 'en');
+        dir: 'assets/pages',
+        fileName: 'privacy',
+        ext: 'md',
+        lang: 'en',
+        bundle: _FakeBundle(<String>{'assets/pages/privacy-en.md'}));
     expect(answer, 'assets/pages/privacy-en.md');
   });
+
+  test('idioma sin fichero propio cae al del idioma de respaldo', () async {
+    final String answer = await getFileNameOfLang(
+        dir: 'assets/pages',
+        fileName: 'privacy',
+        ext: 'md',
+        lang: 'gl',
+        bundle: _FakeBundle(<String>{'assets/pages/privacy-es.md'}));
+    expect(answer, 'assets/pages/privacy-es.md');
+  });
+
+  test('sin traducciones cae al fichero base', () async {
+    final String answer = await getFileNameOfLang(
+        dir: 'assets/pages',
+        fileName: 'privacy',
+        ext: 'md',
+        lang: 'fr',
+        bundle: _FakeBundle(<String>{}));
+    expect(answer, 'assets/pages/privacy.md');
+  });
 }