feat(ui): smooth download progress updates

2026-07-28 23:08:59 +02:00 · 2026-07-23 13:36:22 +07:00
parent cdbb0d6bd7
commit 5481f8e8cf
5 changed files with 544 additions and 242 deletions
@@ -0,0 +1,79 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:spotiflac_android/widgets/smoothed_progress.dart';
+
+Widget _testApp({
+  required double progress,
+  bool animate = true,
+  Duration duration = const Duration(milliseconds: 900),
+}) {
+  return MaterialApp(
+    home: SmoothedProgressScope(
+      value: progress,
+      animate: animate,
+      duration: duration,
+      child: SmoothedProgressBuilder(
+        builder: (context, value, child) => Text(
+          value.toStringAsFixed(3),
+          key: const ValueKey('smoothed-progress-value'),
+        ),
+      ),
+    ),
+  );
+}
+
+double _displayedProgress(WidgetTester tester) {
+  final text = tester.widget<Text>(
+    find.byKey(const ValueKey('smoothed-progress-value')),
+  );
+  return double.parse(text.data!);
+}
+
+void main() {
+  testWidgets('shows the first authoritative value immediately', (
+    tester,
+  ) async {
+    await tester.pumpWidget(_testApp(progress: 0.42));
+
+    expect(_displayedProgress(tester), 0.42);
+  });
+
+  testWidgets('interpolates monotonic progress updates locally', (
+    tester,
+  ) async {
+    await tester.pumpWidget(_testApp(progress: 0.2));
+    await tester.pumpWidget(_testApp(progress: 0.8));
+    await tester.pump(const Duration(milliseconds: 450));
+
+    final halfway = _displayedProgress(tester);
+    expect(halfway, greaterThan(0.2));
+    expect(halfway, lessThan(0.8));
+
+    await tester.pump(const Duration(milliseconds: 450));
+    expect(_displayedProgress(tester), 0.8);
+  });
+
+  testWidgets('snaps resets and completion to the backend value', (
+    tester,
+  ) async {
+    await tester.pumpWidget(_testApp(progress: 0.4));
+    await tester.pumpWidget(_testApp(progress: 0.9));
+    await tester.pump(const Duration(milliseconds: 300));
+
+    await tester.pumpWidget(_testApp(progress: 0.7));
+    expect(_displayedProgress(tester), 0.7);
+
+    await tester.pumpWidget(_testApp(progress: 0.1));
+    expect(_displayedProgress(tester), 0.1);
+
+    await tester.pumpWidget(_testApp(progress: 1));
+    expect(_displayedProgress(tester), 1);
+  });
+
+  testWidgets('snaps updates when animation is disabled', (tester) async {
+    await tester.pumpWidget(_testApp(progress: 0.2));
+    await tester.pumpWidget(_testApp(progress: 0.8, animate: false));
+
+    expect(_displayedProgress(tester), 0.8);
+  });
+}