TF-1822: Write test for all func of FileUtils class

(cherry picked from commit 562f151134416c674467e5a59919ea37adbb7e5f)

core/lib/utils/file_utils.dart

@@ -6,7 +6,7 @@ import 'package:path_provider/path_provider.dart';
 
 class FileUtils {
 
-  static Future<String> _getInternalStorageDirPath(
+  Future<String> _getInternalStorageDirPath(
     String nameFile,
     {
       String? folderPath,
@@ -14,25 +14,32 @@ class FileUtils {
     }
   ) async {
     if (!BuildUtils.isWeb) {
+
       String fileDirectory = (await getApplicationDocumentsDirectory()).absolute.path;
 
-
       if (folderPath != null) {
-        fileDirectory = '$fileDirectory.$folderPath';
+        fileDirectory = '$fileDirectory/$folderPath';
       }
 
-      fileDirectory = '$fileDirectory.$nameFile';
+      Directory directory = Directory(fileDirectory);
+
+      if (!await directory.exists()) {
+        await directory.create(recursive: true);
+      }
+
+      fileDirectory = '$fileDirectory/$nameFile';
 
       if (extensionFile != null) {
         fileDirectory = '$fileDirectory.$extensionFile';
       }
+
       return fileDirectory;
     } else {
       throw DeviceNotSupportedException();
     }
   }
 
-  static Future<File> saveToFile(
+  Future<File> saveToFile(
     String nameFile,
     String content,
     {
@@ -46,20 +53,19 @@ class FileUtils {
       extensionFile: extensionFile
     );
 
-    final file = File('$internalStorageDirPath.txt');
+    final file = File(internalStorageDirPath);
     log("FileUtils()::saveToFile: $file");
 
     return await file.writeAsString(content, mode: FileMode.append);
   }
 
-  static Future<String> getFromFile(
+  Future<String> getFromFile(
     String nameFile,
     {
       String? folderPath,
       String? extensionFile
     }
   ) async {
-    String emailContent = '';
 
     final internalStorageDirPath = await _getInternalStorageDirPath(
       nameFile,
@@ -67,8 +73,8 @@ class FileUtils {
       extensionFile: extensionFile
     );
 
-    final file = File('$internalStorageDirPath.txt');
+    final file = File(internalStorageDirPath);
-    emailContent = await file.readAsString();
+    final emailContent = await file.readAsString();
 
     log("FileUtils()::getFromFile: $emailContent");
 

core/pubspec.lock

@@ -121,14 +121,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.5"
-  external_path:
-    dependency: "direct main"
-    description:
-      name: external_path
-      sha256: "2095c626fbbefe70d5a4afc9b1137172a68ee2c276e51c3c1283394485bea8f4"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.3"
   fake_async:
     dependency: transitive
     description:

core/pubspec.yaml

@@ -65,8 +65,6 @@ dependencies:
 
   path_provider: 2.0.13
 
-  external_path: 1.0.3
-
   path_provider_platform_interface: 2.0.1
 
   # flutter_test from sdk depends on collection 1.17.0

core/test/utils/file_utils_test.dart

@@ -0,0 +1,51 @@
+import 'package:core/utils/file_utils.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:path_provider_platform_interface/path_provider_platform_interface.dart';
+import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+
+const String kApplicationDocumentsPath = 'applicationDocumentsPath';
+
+void main() {
+  const fileName = 'test_file';
+  const fileContent = 'Hello, World!';
+
+  group('fileUtils test', () {
+    setUp(() async {
+      PathProviderPlatform.instance = FakePathProviderPlatform();
+    });
+
+    test('Store private HTLM String to File', () async {
+
+      final file = await FileUtils().saveToFile(fileName, fileContent);
+
+      expect(await file.exists(), equals(true));
+
+      expect(await file.readAsString(), equals(fileContent));
+
+      file.delete();
+    });
+
+    test('Get HTML String from File Private', () async {
+
+      /// Create a temporary file that will be deleted after `getFromFile` is done
+      final file = await FileUtils().saveToFile(fileName, fileContent);
+
+      final htmlString = await FileUtils().getFromFile(fileName);
+
+      expect(htmlString.isNotEmpty, equals(true));
+
+      expect(htmlString, equals(fileContent));
+
+      file.delete();
+    });
+  });
+}
+
+class FakePathProviderPlatform extends Fake
+    with MockPlatformInterfaceMixin
+    implements PathProviderPlatform {
+  @override
+  Future<String?> getApplicationDocumentsPath() async {
+    return kApplicationDocumentsPath;
+  }
+}