Flutter integration tests won't run

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I am trying to write some integration tests using the flutter driver based off of the example here: https://flutter.io/testing/. I am able to get the app to deploy, but all I get back is awaiting for app response.
I'm really not sure what else to do as it just sits and waits.
Here's what I see in the terminal.

flutter drive --target=test_driver/home_category_list_scroll.dart
Using device Sampson's iPhone.
Starting application: test_driver/home_category_list_scroll.dart
Automatically signing iOS for device deployment using specified
development team in Xcode project: QDCF25JLN2
Running pod install... 7.2s
Starting Xcode build...
├─Assembling Flutter resources... 13.0s
└─Compiling, linking and signing... 7.5s
Xcode build done. 27.6s
Installing and launching...
flutter: Observatory listening on http://127.0.0.1:54774/
00:00 +0: scrolling performance test (setUpAll)
[info ] FlutterDriver: Connecting to Flutter application at
http://127.0.0.1:54270
[info ] FlutterDriver: Waiting for application to start
[info ] FlutterDriver: Waiting for application to start
[info ] FlutterDriver: Waiting for application to start


Here's are the first few lines of the test.

void main() {
group('scrolling performance test', () {
FlutterDriver driver;

setUpAll(() async {
// Connects to the app
driver = await FlutterDriver.connect(dartVmServiceUrl: 'http://127.0.0.1:54270');
});

tearDownAll(() async {
if (driver != null) {
// Closes the connection
driver.close();
}
});

test('measure', () async {


Flutter Doctor output:

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, v0.5.8-pre.56, on Mac OS X 10.13.4 17E202, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 9.4.1)
[✓] Android Studio (version 3.0)
✗ Flutter plugin not installed; this adds Flutter specific functionality.
✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] IntelliJ IDEA Community Edition (version 2017.1.6)
[!] VS Code (version 1.24.1)
[✓] Connected devices (1 available)

! Doctor found issues in 1 category.


Thank you for any ideas you can give me.

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