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avatar: Show placeholder on image load error #1882

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avatar: Show placeholder on image load error
vinodsingh-dev-gsoc Oct 3, 2025
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vinodsingh-dev-gsoc Oct 3, 2025
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avatar: Show placeholder on image load error
vinodsingh-dev-gsoc Oct 3, 2025
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2 changes: 1 addition & 1 deletion lib/widgets/user.dart
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Original file line number Diff line number Diff line change
@@ -1,5 +1,4 @@
import 'package:flutter/material.dart';

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Please don't delete this blank line; it separates third-party imports from our own imports. (Here and elsewhere in the PR.)

import '../api/model/model.dart';
import '../model/avatar_url.dart';
import '../model/binding.dart';
Expand Down Expand Up @@ -90,6 +89,7 @@ class AvatarImage extends StatelessWidget {
avatarUrl.get(physicalSize),
filterQuality: FilterQuality.medium,
fit: BoxFit.cover,
errorBuilder: (_, _, _) => _AvatarPlaceholder(size: size),
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Please also change the resolvedUrl == null case to return _AvatarPlaceholder, too, for this part of the issue description in #1558:

because the URL is invalid

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and add a test for that.

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Same for the user == null case above that, for this part of the issue description:

Or, pre-#1556, for a message from an unknown sender

);
}
}
Expand Down
17 changes: 11 additions & 6 deletions test/test_images.dart
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
import 'dart:async';
import 'dart:io';

import 'dart:typed_data';
import 'package:flutter/widgets.dart';
import 'package:flutter_test/flutter_test.dart';

Expand All @@ -12,15 +12,20 @@ import 'package:flutter_test/flutter_test.dart';
/// before the end of the test.
// TODO(upstream) simplify callers by using addTearDown: https://github.com/flutter/flutter/issues/123189
// See also: https://github.com/flutter/flutter/issues/121917
FakeImageHttpClient prepareBoringImageHttpClient() {
FakeImageHttpClient prepareBoringImageHttpClient({bool success = true}) {
final httpClient = FakeImageHttpClient();
debugNetworkImageHttpClientProvider = () => httpClient;
httpClient.request.response
..statusCode = HttpStatus.ok
..content = kSolidBlueAvatar;
if (success) {
httpClient.request.response
..statusCode = HttpStatus.ok
..content = kSolidBlueAvatar;
} else {
httpClient.request.response
..statusCode = HttpStatus.notFound
..content = Uint8List(0);
}
return httpClient;
}

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Keep this blank line, which exists to give the code some breathing room so it's more readable.

class FakeImageHttpClient extends Fake implements HttpClient {
final FakeImageHttpClientRequest request = FakeImageHttpClientRequest();

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24 changes: 23 additions & 1 deletion test/widgets/user_test.dart
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Expand Up @@ -5,14 +5,15 @@ import 'package:flutter/rendering.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:zulip/model/store.dart';
import 'package:zulip/widgets/content.dart';
import 'package:zulip/widgets/icons.dart';
import 'package:zulip/widgets/store.dart';
import 'package:zulip/widgets/user.dart';

import '../example_data.dart' as eg;
import '../model/binding.dart';
import '../model/test_store.dart';
import '../stdlib_checks.dart';
import '../test_images.dart';
import 'test_app.dart';

void main() {
TestZulipBinding.ensureInitialized();
Expand Down Expand Up @@ -78,5 +79,26 @@ void main() {
check(await actualUrl(tester, avatarUrl)).isNull();
debugNetworkImageHttpClientProvider = null;
});
testWidgets('shows placeholder when image URL gives error', (WidgetTester tester) async {
addTearDown(testBinding.reset);
prepareBoringImageHttpClient(success: false);
await testBinding.globalStore.add(eg.selfAccount, eg.initialSnapshot());
final store = await testBinding.globalStore.perAccount(eg.selfAccount.id);
final badUser = eg.user(avatarUrl: 'https://zulip.com/avatarinvalid.png');
await store.addUser(badUser);
await tester.pumpWidget(TestZulipApp(
child: PerAccountStoreWidget(
accountId: eg.selfAccount.id,
child: AvatarImage(userId: badUser.userId, size: 30))));
Comment on lines +89 to +92
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Should be able to pass an accountId to TestZulipApp instead of adding a PerAccountStoreWidget here.

await tester.pumpAndSettle();
expect(
find.descendant(
of: find.byType(AvatarImage),
matching: find.byIcon(ZulipIcons.person),
),
findsOneWidget,
);
debugNetworkImageHttpClientProvider = null;
});
Comment on lines +82 to +102
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nits:

  • Empty line before a test
  • Try to adjust indentation and spacing to follow the pattern of existing tests
  • Use check instead of expect; see existing tests for examples

});
}