Fix legacy import violations in opted in libraries (#1370)

Part of https://github.com/dart-lang/sdk/issues/44063

Had to opt out several libraries and undo their migrations, but we were in a bad state previously where we could have been broken by migrations of several packages. 
25 files changed
tree: fc0f50b92a1494e84309060a2cf95f4f0fa4b6d4
  1. pkgs/
  2. tool/
  3. .gitignore
  4. .travis.yml
  5. analysis_options.yaml
  6. CONTRIBUTING.md
  7. mono_repo.yaml
  8. README.md
README.md

Test Mono Repository

This repository contains packages for writing and running Dart tests.

test

A full featured packaged for writing and running Dart tests on various platforms, e.g. VM, Chrome, Node etc.

test_api

A minimal package for writing tests. This package is used by package:test and package:test_core.

test_core

A minimal package for writing and running tests. It also contains extensions for implementing a custom test runner. This package is used by package:test.