test(core): add designable tests

[janryWang]

Before submitting a pull request, please make sure the following is done...

• Ensure the pull request title and commit message follow the Commit Specific in English.
• Fork the repo and create your branch from master or formily_next.
• If you've added code that should be tested, add tests!
• If you've changed APIs, update the documentation.
• Ensure the test suite passes (npm test).
• Make sure your code lints (npm run lint) - we've done our best to make sure these rules match our internal linting guidelines.

Please do not delete the above content

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What have you changed?

[codecov]

Codecov Report

Merging #1972 (906958c) into formily_next (48f574e) will increase coverage by 0.62%.
The diff coverage is 97.70%.

@@               Coverage Diff                @@
##           formily_next    #1972      +/-   ##
================================================
+ Coverage         92.70%   93.32%   +0.62%     
================================================
  Files               136      137       +1     
  Lines              6114     6144      +30     
  Branches           1520     1471      -49     
================================================
+ Hits               5668     5734      +66     
+ Misses              442      406      -36     
  Partials              4        4              

Impacted Files	Coverage Δ
packages/core/src/models/Form.ts	99.38% <90.00%> (-0.32%)	⬇️
packages/core/src/models/ArrayField.ts	100.00% <100.00%> (ø)
packages/core/src/models/Field.ts	99.21% <100.00%> (+<0.01%)	⬆️
packages/core/src/models/Heart.ts	100.00% <100.00%> (ø)
packages/core/src/models/ObjectField.ts	100.00% <100.00%> (ø)
packages/core/src/models/VoidField.ts	100.00% <100.00%> (ø)
packages/core/src/shared/internals.ts	100.00% <100.00%> (+4.20%)	⬆️
packages/reactive/src/batch.ts	100.00% <0.00%> (ø)
packages/reactive/src/index.ts	100.00% <0.00%> (ø)
packages/reactive/src/untracked.ts	100.00% <0.00%> (ø)
... and 8 more

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[github-actions]

Size Change: +89 B (0%)

Total Size: 1.58 MB

Filename	Size	Change
packages/core/dist/formily.core.umd.development.js	18.7 kB	+58 B (0%)
packages/core/dist/formily.core.umd.production.js	12.3 kB	+31 B (0%)

ℹ️ View Unchanged

Filename	Size
designable/antd/dist/formily.designable.antd.umd.development.js	354 kB
designable/antd/dist/formily.designable.antd.umd.production.js	239 kB
designable/next/dist/formily.designable.next.umd.development.js	332 B
designable/next/dist/formily.designable.next.umd.production.js	252 B
designable/setters/dist/formily.designable.antd.umd.development.js	329 kB
designable/setters/dist/formily.designable.antd.umd.production.js	220 kB
packages/antd/dist/formily.antd.umd.development.js	61.2 kB
packages/antd/dist/formily.antd.umd.production.js	34.8 kB
packages/element/dist/formily.element.umd.development.js	53.6 kB
packages/element/dist/formily.element.umd.production.js	30.5 kB
packages/json-schema/dist/formily.json-schema.umd.development.js	7.13 kB
packages/json-schema/dist/formily.json-schema.umd.production.js	5 kB
packages/next/dist/formily.next.umd.development.js	62.6 kB
packages/next/dist/formily.next.umd.production.js	36.4 kB
packages/path/dist/formily.path.umd.development.js	13.1 kB
packages/path/dist/formily.path.umd.production.js	8.4 kB
packages/react/dist/formily.react.umd.development.js	11.4 kB
packages/react/dist/formily.react.umd.production.js	7.11 kB
packages/reactive-react/dist/formily.reactive-react.umd.development.js	3.61 kB
packages/reactive-react/dist/formily.reactive-react.umd.production.js	2.26 kB
packages/reactive-vue/dist/formily.reactive-vue.umd.development.js	2.79 kB
packages/reactive-vue/dist/formily.reactive-vue.umd.production.js	1.76 kB
packages/reactive/dist/formily.reactive.umd.development.js	8.67 kB
packages/reactive/dist/formily.reactive.umd.production.js	4.97 kB
packages/shared/dist/formily.shared.umd.development.js	7.38 kB
packages/shared/dist/formily.shared.umd.production.js	4.19 kB
packages/validator/dist/formily.validator.umd.development.js	7.58 kB
packages/validator/dist/formily.validator.umd.production.js	5.66 kB
packages/vue/dist/formily.vue.umd.development.js	14.9 kB
packages/vue/dist/formily.vue.umd.production.js	9.32 kB

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