fix tests

Author: denrase

dart/lib/src/transport/client_report_transport.dart

@@ -1,6 +1,5 @@
 import 'package:meta/meta.dart';
 import '../../sentry.dart';
-import '../client_reports/client_report_recorder.dart';
 import '../sentry_envelope_header.dart';
 import 'rate_limiter.dart';
 

dart/test/transport/client_report_transport_test.dart

@@ -27,6 +27,8 @@ void main() {
       final sut = fixture.getSut(rateLimiter: mockRateLimiter);
 
       final envelope = MockEnvelope();
+      envelope.items = [SentryEnvelopeItem.fromEvent(SentryEvent())];
+
       await sut.send(envelope);
 
       expect(mockRateLimiter.envelopeToFilter, envelope);
@@ -38,6 +40,8 @@ void main() {
       final sut = fixture.getSut(rateLimiter: mockRateLimiter);
 
       final envelope = MockEnvelope();
+      envelope.items = [SentryEnvelopeItem.fromEvent(SentryEvent())];
+
       final eventId = await sut.send(envelope);
 
       expect(eventId, SentryId.empty());