Why does running flutter drive begin Downloading web sdk?

I'm trying to run integration tests with the integration_test package. When I run flutter drive --driver=test_driver/integration_test.dart --target=integration_test/splash_test.dart to test my splash screen it says Downloading Web SDK. There is no web implementation in my app and the download is taking too long on my connection. Why is this happening and can I skip it to go straight to testing on mobile? Thanks in advance. PS: Even when I run flutter drive help it starts downloading this "Web SDK". I'm on the Flutter master channel version 2.1.0-13.0.pre.574.