flutter drive should print a friendlier message when invoked with the wrong target file name #62626
Description
The following usage of flutter drive fails:
$ ls test_driver/keyboard_resize_test.dart
test_driver/keyboard_resize_test.dart
$ flutter drive --target=test_driver/keyboard_resize_test.dart
Using device iPhone (2).
Test file not found: /Users/myname/dev/flutter/dev/integration_tests/ui/test_driver/keyboard_resize_test_test.dartNotice 'keyboard_resize_test_test.dart` in the message.
flutter doctor:
[✓] Flutter (Channel master, 1.21.0-6.0.pre.129, on Mac OS X 10.15.5 19F101, locale en-US)
• Flutter version 1.21.0-6.0.pre.129 at /Users/aaclarke/dev/flutter
• Framework revision 30aef0a3b9 (2 hours ago), 2020-07-30 14:20:21 -0700
• Engine revision a9910e409c
• Dart version 2.10.0 (build 2.10.0-1.0.dev 24c7666def)
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Issues that are less important to the Flutter project"flutter test", flutter_test, or one of our testsFound to occur in 3.0Found to occur in 3.1The issue has been confirmed reproducible and is ready to work on"flutter driver", flutter_drive, or a driver testOwned by Flutter Tool teamAffects the "flutter" command-line tool. See also t: labels.Triaged by Flutter Tool team