Fix stats tests

Author: brianegan

bloc_library/lib/blocs/stats/stats_bloc.dart

@@ -12,7 +12,7 @@ class StatsBloc extends Bloc<StatsEvent, StatsState> {
     : super(
         todosBloc.state is TodosLoaded
             ? _mapTodosToStats((todosBloc.state as TodosLoaded).todos)
-            : StatsLoaded(0, 0),
+            : StatsLoading(),
       ) {
     todosSubscription = todosBloc.stream.listen((state) {
       if (state is TodosLoaded) {

bloc_library/test/blocs/stats_bloc_test.dart

@@ -5,6 +5,7 @@ import 'package:bloc_library/blocs/todos/todos.dart';
 import 'package:bloc_library/models/models.dart';
 import 'package:bloc_test/bloc_test.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:mocktail/mocktail.dart';
 
 class MockTodosBloc extends MockBloc<TodosEvent, TodosState>
     implements TodosBloc {}
@@ -13,45 +14,50 @@ void main() {
   group('StatsBloc', () {
     final todo1 = Todo('Hallo');
     final todo2 = Todo('Hallo2', complete: true);
-    late TodosBloc todosBloc;
-    late StatsBloc statsBloc;
-
-    setUp(() {
-      todosBloc = MockTodosBloc();
-      statsBloc = StatsBloc(todosBloc: todosBloc);
-    });
 
     blocTest<StatsBloc, StatsState>(
       'should update the stats properly when TodosBloc emits TodosLoaded',
       build: () {
-        todosBloc = MockTodosBloc();
+        final todosBloc = MockTodosBloc();
+        when(() => todosBloc.state).thenReturn(TodosLoading());
         whenListen(
           todosBloc,
           Stream<TodosState>.fromIterable([TodosLoaded([])]),
         );
         return StatsBloc(todosBloc: todosBloc);
       },
-      act: (StatsBloc bloc) async => bloc.add(UpdateStats([])),
       expect: () => [StatsLoaded(0, 0)],
     );
 
     blocTest<StatsBloc, StatsState>(
       'should update the stats properly when Todos are empty',
-      build: () => statsBloc,
+      build: () {
+        final todosBloc = MockTodosBloc();
+        when(() => todosBloc.state).thenReturn(TodosLoading());
+        return StatsBloc(todosBloc: todosBloc);
+      },
       act: (StatsBloc bloc) async => bloc.add(UpdateStats([])),
       expect: () => [StatsLoaded(0, 0)],
     );
 
     blocTest<StatsBloc, StatsState>(
       'should update the stats properly when Todos contains one active todo',
-      build: () => statsBloc,
+      build: () {
+        final todosBloc = MockTodosBloc();
+        when(() => todosBloc.state).thenReturn(TodosLoading());
+        return StatsBloc(todosBloc: todosBloc);
+      },
       act: (StatsBloc bloc) async => bloc.add(UpdateStats([todo1])),
       expect: () => [StatsLoaded(1, 0)],
     );
 
     blocTest<StatsBloc, StatsState>(
       'should update the stats properly when Todos contains one active todo and one completed todo',
-      build: () => statsBloc,
+      build: () {
+        final todosBloc = MockTodosBloc();
+        when(() => todosBloc.state).thenReturn(TodosLoading());
+        return StatsBloc(todosBloc: todosBloc);
+      },
       act: (StatsBloc bloc) async => bloc.add(UpdateStats([todo1, todo2])),
       expect: () => [StatsLoaded(1, 1)],
     );