test(routes): stop checking for res.text

[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?

nope, updated

Motivation / Use-Case

I want to get rid of source code snapshots because a person who submits a pr might make a mistake. e.g. build using the old code and update the snapshot. But it is difficult to check at the review. (of course, CI will tell us)
I want to avoid testing being dependent on the built file of user's local. Also, clients are changing frequently.

Breaking Changes

no

Additional Info

[codecov]

Codecov Report

Merging #1952 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1952   +/-   ##
======================================
  Coverage    91.8%   91.8%           
======================================
  Files          23      23           
  Lines         903     903           
  Branches      283     283           
======================================
  Hits          829     829           
  Misses         71      71           
  Partials        3       3

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