Now that we have thousands of tests, it doesn't make sense to display a separate line for each test. The result is just megabytes of logs that you have to scrub through to find error messages.
The files in this directory are used as part of tests in the
flutter_tools package. Some are here because here these tests need a
pubspec.yaml that references the flutter framework (which is
intentionally not true of the flutter_tools package). Others are
here mostly out of peer pressure.