Ch/design tweak test

[ccchwang]

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update
• Refactor
• Build tools
• Documentation
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

Does this PR fulfill these requirements:

• [ ] All tests are passing
• [ ] yarn pretty has been run
• [ ] Commits reference open issues

Additional Information

[codecov-io]

Codecov Report

Merging #459 into master will decrease coverage by 19.51%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           master     #459       +/-   ##
===========================================
- Coverage   93.19%   73.68%   -19.52%     
===========================================
  Files          29       44       +15     
  Lines        1029     1368      +339     
  Branches      197      255       +58     
===========================================
+ Hits          959     1008       +49     
- Misses         59      295      +236     
- Partials       11       65       +54

Impacted Files	Coverage Δ
packages/microcosm/src/utils.js	100% <ø> (+1.36%)	:arrow_up:
packages/microcosm/src/action.js	100% <100%> (+3.41%)	:arrow_up:
packages/microcosm/src/coroutine.js	100% <100%> (+56%)	:arrow_up:
packages/microcosm/src/addons/action-form.js	97.61% <100%> (ø)
packages/microcosm/src/addons/indexing.js	0% <0%> (-100%)	:arrow_down:
packages/microcosm/src/addons/action-queue.js	0% <0%> (-80%)	:arrow_down:
packages/microcosm-preact/test/helpers.js
packages/microcosm-preact/test/setup.js
packages/microcosm-graphql/src/repo.js	0% <0%> (ø)
packages/microcosm-graphql/src/errors.js	0% <0%> (ø)
... and 23 more

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