test: savings prediction chart

test/src/ui/widgets/charts/retirement_prediction_chart_test.dart

@@ -1,24 +1,44 @@
+import 'package:bloc_test/bloc_test.dart';
+import 'package:financial_dashboard/financial_data/financial_data.dart';
 import 'package:financial_dashboard/ui/ui.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:mocktail/mocktail.dart';
 
 import '../../../../helpers/helpers.dart';
 
+class _MockFinancialDataBloc
+    extends MockBloc<FinancialDataEvent, FinancialDataState>
+    implements FinancialDataBloc {}
+
 void main() {
   group('RetirementPredictionChart', () {
-    Widget buildSubject({
-      void Function(String)? onCurrentSavings,
-    }) =>
-        RetirementPredictionChart();
+    late FinancialDataBloc financialDataBloc;
+
+    setUp(() {
+      financialDataBloc = _MockFinancialDataBloc();
+
+      when(() => financialDataBloc.state).thenReturn(
+        FinancialDataState(
+          savingsDataPoints: createSampleData(),
+        ),
+      );
+    });
 
     testWidgets('renders LineChartBody', (tester) async {
-      await tester.pumpExperience(buildSubject());
+      await tester.pumpExperience(
+        RetirementPredictionChart(),
+        financialDataBloc: financialDataBloc,
+      );
 
       expect(find.byType(LineChartBody), findsOneWidget);
     });
 
     testWidgets('shows and hides tooltip on gestures', (tester) async {
-      await tester.pumpExperience(buildSubject());
+      await tester.pumpExperience(
+        RetirementPredictionChart(),
+        financialDataBloc: financialDataBloc,
+      );
       final keyFinder = find.byKey(const Key('chart_tooltip'));
 
       expect(keyFinder, findsNothing);