Add tests for parsing dateTime from fileNames

test/utils/date_time_util_test.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/foundation.dart';
+import 'package:photos/utils/date_time_util.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test("parseDateTimeFromFile", () {
+    final List<String> validParsing = [
+      "IMG-20221109-WA0000",
+      '''Screenshot_20220807-195908_Firefox''',
+      '''Screenshot_20220507-195908''',
+      "2019-02-18 16.00.12-DCMX",
+      "20221107_231730",
+      "2020-11-01 02.31.02",
+      "IMG_20210921_144423",
+      "2019-10-31 155703",
+      "IMG_20210921_144423_783",
+      "Screenshot_2022-06-21-16-51-29-164_newFormat",
+    ];
+    for (String val in validParsing) {
+      final parsedValue = parseDateTimeFromFileNameV2(val);
+      expect(
+        parsedValue != null,
+        true,
+        reason: "Failed to parse time from $val",
+      );
+      if (kDebugMode) {
+        debugPrint("Parsed $val as ${parsedValue?.toIso8601String()}");
+      }
+    }
+  });
+}