anchor.diff:        expect(observatoryContent, startsWith('<!DOCTYPE html>'));
   
         // Check that DevTools assets are accessible.
  -      final devtoolsRequest = await client.getUrl(dds.devToolsUri);
  +      final devtoolsRequest = await client.getUrl(dds!.devToolsUri!);
         final devtoolsResponse = await devtoolsRequest.close();
         expect(devtoolsResponse.statusCode, 200);
         final devtoolsContent =
  
positive.code: // Regression test for https://github.com/dart-lang/sdk/issues/45933.
  
  void main() {
    Process process;
    DartDevelopmentService dds;
  
    setUp(() async {
      // We don't care what's actually running in the target process for this
  
negative.code:     process = null;
    });
  
    defineTest({required bool authCodesEnabled}) {
      test(
          'Ensure Observatory and DevTools assets are available with '
          '${authCodesEnabled ? '' : 'no'} auth codes', () async {
  