Copy expect and async matchers from test package

dart-lang / matcher

A declarative API for specifying expectations.

https://pub.dev/packages/matcher

BSD 3-Clause "New" or "Revised" License

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Closed natebosch closed 1 year ago

natebosch commented 1 year ago

Copy most of the test_api/frontend directory, except for the test related to the scaffolding functions.
Modify code to follow some stricter lints in the matcher package - avoid implicit dynamic arguments, use relative imports, and fix comment references.
Copy matcher relevant parts of the package:test README into this README.