add options test

[hiroppy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Motivation / Use-Case

I want to avoid forgetting to add an errorMessage when we add a property.

I added snapshots because #1819 has a big refactoring of options.json but I don' think they are not necessary. Maybe, I'll delete them after merging of #1819.

Breaking Changes

Additional Info

We should add documents about sockPort, injectClient and injectHot.

[codecov]

Codecov Report

Merging #1821 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1821   +/-   ##
=======================================
  Coverage   87.66%   87.66%           
=======================================
  Files           9        9           
  Lines         608      608           
  Branches      185      185           
=======================================
  Hits          533      533           
  Misses         63       63           
  Partials       12       12

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