fixes timestamping across timezones

2026-05-14 22:51:04 -07:00
parent cbdc3f7710
commit d32720a2e0
6 changed files with 225 additions and 7 deletions
@@ -0,0 +1,106 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:intl/intl.dart';
+import 'package:kryz_go_flutter/time_formatter.dart';
+import 'package:timezone/data/latest.dart' as tz;
+import 'package:timezone/timezone.dart' as tz;
+
+void main() {
+  setUpAll(() {
+    tz.initializeTimeZones();
+  });
+
+  group('formatStartingTime', () {
+    test('returns local display from source timezone naive server time', () {
+      const String sourceTime = '2026-05-14 20:00:00';
+      const String sourceZone = 'America/Los_Angeles';
+
+      final tz.TZDateTime source = tz.TZDateTime(
+        tz.getLocation(sourceZone),
+        2026,
+        5,
+        14,
+        20,
+      );
+      final String expected = DateFormat('jm').format(
+        DateTime.fromMillisecondsSinceEpoch(
+          source.millisecondsSinceEpoch,
+          isUtc: true,
+        ).toLocal(),
+      );
+
+      expect(
+        formatStartingTime(sourceTime, sourceTimezone: sourceZone),
+        expected,
+      );
+    });
+
+    test('falls back to parsed local time when timezone is invalid', () {
+      final DateTime parsed = DateTime.parse('2026-05-14 20:00:00');
+      final String expected = DateFormat('jm').format(parsed);
+
+      expect(
+        formatStartingTime(
+          '2026-05-14 20:00:00',
+          sourceTimezone: 'Invalid/Timezone',
+        ),
+        expected,
+      );
+    });
+
+    test('returns placeholder for invalid input', () {
+      expect(formatStartingTime('not-a-time'), '--:--');
+      expect(formatStartingTime(null), '--:--');
+    });
+
+    test('does not double-convert timestamps with explicit UTC designator', () {
+      const String utcStamp = '2026-05-15T03:00:00Z';
+      final String expected = DateFormat('jm').format(DateTime.parse(utcStamp).toLocal());
+
+      expect(
+        formatStartingTime(
+          utcStamp,
+          sourceTimezone: 'America/Los_Angeles',
+        ),
+        expected,
+      );
+    });
+
+    test('keeps wall-clock time when local matches source zone for naive input', () {
+      const String sourceTime = '2026-05-14 20:00:00';
+      const String sourceZone = 'America/Los_Angeles';
+
+      final tz.TZDateTime source = tz.TZDateTime(
+        tz.getLocation(sourceZone),
+        2026,
+        5,
+        14,
+        20,
+      );
+      final String expected = DateFormat('jm').format(
+        DateTime.fromMillisecondsSinceEpoch(
+          source.millisecondsSinceEpoch,
+          isUtc: true,
+        ).toLocal(),
+      );
+
+      expect(
+        formatStartingTime(sourceTime, sourceTimezone: sourceZone),
+        expected,
+      );
+    });
+  });
+
+  group('formatTimeWindow', () {
+    test('returns mm:ss style duration from server times', () {
+      expect(
+        formatTimeWindow('2026-05-15 05:18:46.000000', '2026-05-15 05:23:21.000000'),
+        '04:35',
+      );
+    });
+
+    test('returns placeholder for invalid windows', () {
+      expect(formatTimeWindow('nope', '2026-05-15 05:23:21.000000'), '--:--');
+      expect(formatTimeWindow(null, '2026-05-15 05:23:21.000000'), '--:--');
+    });
+  });
+}