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test(goldens): scoped 0.5% diff threshold for chart-line drift #624

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Merged
TaprootFreak merged 1 commit into from
Jun 1, 2026
Merged

test(goldens): scoped 0.5% diff threshold for chart-line drift #624

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190 changes: 104 additions & 86 deletions test/goldens/screens/home/home_golden_test.dart
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
import 'package:alchemist/alchemist.dart'
show AlchemistConfig, PlatformGoldensConfig;
import 'package:bloc_test/bloc_test.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
Expand Down Expand Up @@ -51,96 +53,112 @@ void main() {
// the DashboardView with the live price + chart, not the software-terms
// intro of HomePage. We render DashboardView here to match the handbook
// ground truth while keeping the gap's `home_page_loaded` filename.
goldenTest(
'loaded state with price data',
fileName: 'home_page_loaded',
constraints: const BoxConstraints.tightFor(width: 390, height: 844),
builder: () {
final dashboardBloc = _MockDashboardBloc();
final balanceCubit = _MockBalanceCubit();
final pendingTxCubit = _MockPendingTransactionsCubit();
final settingsBloc = MockSettingsBloc();
//
// Scoped 0.5% diff threshold: the price chart's stroked path renders
// with sub-pixel anti-aliasing whose exact coverage values jitter
// across runs even on the locked dfx01 renderer (chart-line drift was
// regenerated twice within five days under bot commit 044852b and the
// d25c61d follow-up, both touching only the curve region). Other
// goldens have no such drift surface and remain at the 0.0 default.
AlchemistConfig.runWithConfig(
config: AlchemistConfig.current().merge(
const AlchemistConfig(
platformGoldensConfig: PlatformGoldensConfig(diffThreshold: 0.005),
),
),
run: () => goldenTest(
'loaded state with price data',
fileName: 'home_page_loaded',
constraints: const BoxConstraints.tightFor(width: 390, height: 844),
builder: () {
final dashboardBloc = _MockDashboardBloc();
final balanceCubit = _MockBalanceCubit();
final pendingTxCubit = _MockPendingTransactionsCubit();
final settingsBloc = MockSettingsBloc();

// ~30 price points climbing from 1.10 to 1.43 with a small dip near
// the middle, then a brief sideways stretch — produces a recognizable
// upward chart curve matching the handbook visual.
final now = DateTime(2026, 5, 23);
final priceChartValues = <int>[
110,
112,
114,
113,
115,
117,
119,
118,
120,
122,
121,
119,
117,
115,
113,
116,
120,
124,
128,
131,
134,
136,
138,
139,
140,
141,
142,
143,
143,
143,
];
final priceChart = <PricePoint>[
for (var i = 0; i < priceChartValues.length; i++)
PricePoint(
asset: realUnitAsset,
price: BigInt.from(priceChartValues[i]),
time: now.subtract(
Duration(days: priceChartValues.length - 1 - i),
// ~30 price points climbing from 1.10 to 1.43 with a small dip near
// the middle, then a brief sideways stretch — produces a recognizable
// upward chart curve matching the handbook visual.
final now = DateTime(2026, 5, 23);
final priceChartValues = <int>[
110,
112,
114,
113,
115,
117,
119,
118,
120,
122,
121,
119,
117,
115,
113,
116,
120,
124,
128,
131,
134,
136,
138,
139,
140,
141,
142,
143,
143,
143,
];
final priceChart = <PricePoint>[
for (var i = 0; i < priceChartValues.length; i++)
PricePoint(
asset: realUnitAsset,
price: BigInt.from(priceChartValues[i]),
time: now.subtract(
Duration(days: priceChartValues.length - 1 - i),
),
),
),
];
];

when(() => dashboardBloc.state).thenReturn(
DashboardState(
price: BigInt.from(143),
priceChart: priceChart,
portfolioHistory: const [],
currency: Currency.chf,
),
);
when(() => balanceCubit.state).thenReturn(
Balance(
chainId: realUnitAsset.chainId,
contractAddress: realUnitAsset.address,
walletAddress: '0x0',
balance: BigInt.zero,
asset: realUnitAsset,
),
);
when(() => balanceCubit.asset).thenReturn(realUnitAsset);
when(() => pendingTxCubit.state).thenReturn(const <TransactionDto>[]);
when(() => settingsBloc.state).thenReturn(const SettingsState());
when(() => dashboardBloc.state).thenReturn(
DashboardState(
price: BigInt.from(143),
priceChart: priceChart,
portfolioHistory: const [],
currency: Currency.chf,
),
);
when(() => balanceCubit.state).thenReturn(
Balance(
chainId: realUnitAsset.chainId,
contractAddress: realUnitAsset.address,
walletAddress: '0x0',
balance: BigInt.zero,
asset: realUnitAsset,
),
);
when(() => balanceCubit.asset).thenReturn(realUnitAsset);
when(() => pendingTxCubit.state).thenReturn(const <TransactionDto>[]);
when(() => settingsBloc.state).thenReturn(const SettingsState());

return wrapForGolden(
MultiBlocProvider(
providers: [
BlocProvider<SettingsBloc>.value(value: settingsBloc),
BlocProvider<DashboardBloc>.value(value: dashboardBloc),
BlocProvider<BalanceCubit>.value(value: balanceCubit),
BlocProvider<PendingTransactionsCubit>.value(value: pendingTxCubit),
],
child: const DashboardView(),
),
);
},
return wrapForGolden(
MultiBlocProvider(
providers: [
BlocProvider<SettingsBloc>.value(value: settingsBloc),
BlocProvider<DashboardBloc>.value(value: dashboardBloc),
BlocProvider<BalanceCubit>.value(value: balanceCubit),
BlocProvider<PendingTransactionsCubit>.value(
value: pendingTxCubit,
),
],
child: const DashboardView(),
),
);
},
),
);
});
}
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