Chris Bracken d42e2f004c Extract Dart test utilities library (flutter/engine#20874)
This extracts a Dart test utilities library, containing
`expectAssertion` and `expectArgumentError` functions that simplify
running tests that test assertions across debug, profile, and release
configurations.

This change also restricts Dart unit tests to testing files whose
filename matches `*_test.dart` under `flutter/testing/dart`; previously
any file in that directory was run, but all files matched the above
pattern.
2020-08-30 11:07:05 -07:00
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