Add tests for whenListenPresentation

packages/bloc_presentation_test/test/when_listen_presentation_test.dart

@@ -0,0 +1,57 @@
+import 'dart:async';
+
+import 'package:bloc_presentation_test/bloc_presentation_test.dart';
+import 'package:mocktail/mocktail.dart';
+import 'package:test/expect.dart';
+import 'package:test/scaffolding.dart';
+
+import 'cubits/counter_cubit.dart';
+
+class _MockCounterCubit extends Mock implements CounterCubit {}
+
+void main() {
+  late _MockCounterCubit cubit;
+  late List<StreamSubscription<dynamic>> subscriptions;
+
+  setUp(() {
+    cubit = _MockCounterCubit();
+
+    subscriptions = [];
+  });
+
+  tearDown(() async {
+    await cubit.close();
+    await subscriptions.map((sub) => sub.cancel()).wait;
+  });
+
+  group('whenListenPresentation', () {
+    test(
+      'returns controller whose stream can be listened to more than once',
+      () {
+        final controller = whenListenPresentation(cubit);
+
+        subscriptions.add(controller.stream.listen((_) {}));
+
+        expect(
+          () => subscriptions.add(controller.stream.listen((_) {})),
+          returnsNormally,
+        );
+      },
+    );
+
+    test(
+      'stubs cubit presentation with a stream that can be listened to more '
+      'than once',
+      () {
+        whenListenPresentation(cubit);
+
+        subscriptions.add(cubit.presentation.listen((_) {}));
+
+        expect(
+          () => subscriptions.add(cubit.presentation.listen((_) {})),
+          returnsNormally,
+        );
+      },
+    );
+  });
+}