It's a relevant `package.json` if the package has a test suite. If `test` isn't
specified then the tests won't run in CI (they have't been running).
Include a fix for one failing test in `packages/plugins/ens` and two failing
test in `packages/stack/deployment`. In all three cases, the mock embark
object's config needed a `blockchainConfig` section with `{ enabled: true }`.
* chore: test framework
* chore(@embark/testing): introduce Plugin apis and other changes
* refactor(@embark/deployment): use new testing APIs for tests