[PR 1318][PR1318] introduces a monorepo member that's used as a DApp
dependency, but the present arrangement whereby `test_dapps/` is an embedded
monorepo makes it difficult to develop and test such packages in tandem with
changes to `test_dapps/packages/*`.
Reorganize `test_dapps/*` as members of the root monorepo and make various
adjustments accordingly. This makes it easy to develop test dapps and any
packages they depend on simultaneously, but we lose the CI/QA arrangement where
test dapps are run with an embark installed from fresh tarballs. That
arrangement, which is quite worthwhile as a means to detect problems arising
from transitive dependencies as soon as possible, will be re-introduced in
another PR, possibly involving an auxiliary repository such as
embark-framework/dapp-bin.
Since the `package.json` `"test"` scripts of `test_dapps/*` are now kicked off
as part of `yarn test` in the root, and since port allocation isn't fully
dynamic, it's important to run `yarn test` with `lerna run`'s `--concurrency=1`
option. For the same reasons, the root `ci` and `qa` scripts are similarly
restricted. In the future, this setup can be refactored and improved, along
with use of `lerna run`'s `--since` option to increase testing efficiency in
CI.
[PR1318]: https://github.com/embark-framework/embark/pull/1318
Jonathan Rainville
Michael Bradley, Jr