anchor.diff:          expect(uri.path, contains('file${counter++}.dart'));
           invalidate += 1;
         };
  -      final verifyR = (String entryPoint) {
  +      final verifyR = (String? entryPoint) {
           expect(compile, equals(true));
           expect(invalidate, equals(2));
           expect(acceptDelta, equals(true));
  
positive.code: 
      group('http uris', () {
        var host = 'localhost';
        File dillFile;
        int port;
        HttpServer server;
  
        setUp(() async {
          dillFile = File('${tempDir.path}/app.dill');
  
negative.code:         expect(uri.path, contains('file${counter++}.dart'));
          invalidated += 1;
        };
        final verifyR = (String? entryPoint) {
          expect(invalidated, equals(2));
          expect(entryPoint, equals('file2.dart'));
          recompileDeltaCalled.sendPort.send(true);
  