Update to latest test_* deps (#148)

Add `test_api` and `test_core` to `dev_dependencies` in addition to
`dependency_overrides`. This prevents a warning on publish about
overriding non-dev dependencies.

Use `any` constraints` for the `dev_dependencies` since they are already
constrained correctly by `dependency_overrides`.

Bump min SDK in pubspec and on Travis to match the latest `test`.
2 files changed
tree: 5474700802f1aae100e79534f4f9721234660797
  1. lib/
  2. test/
  3. .gitignore
  4. .test_config
  5. .travis.yml
  6. analysis_options.yaml
  7. CHANGELOG.md
  8. LICENSE
  9. pubspec.yaml
  10. README.md
README.md

Support for specifying test expectations, such as for unit tests.

The matcher library provides a third-generation assertion mechanism, drawing inspiration from Hamcrest.

For more information, see Unit Testing with Dart.