Take coverage of tests for Migemo/utf8

[ichizok]

http://rhysd.hatenablog.com/entry/2017/11/27/091003

Vim 8.0.1372 (https://github.com/vim/vim/commit/ac112f01a6930c9d15cf0360b657373699916bfd) should have resolved covimerage error.

[rhysd]

Thank you for this patch. This patch must improve running tests so I plan to merge this after above tiny review comments are fixed.

By this patch, on Vim 8.0.1372 or later, coverage for migemo feature can be taken. However, Vim on Travis CI is older. So I cannot confirm this patch works. Did you try this patch with the Vim after 8.0.1372 and confirmed it works?

[codecov-io]

Codecov Report

Merging #36 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #36   +/-   ##
=======================================
  Coverage   90.87%   90.87%           
=======================================
  Files           3        3           
  Lines         285      285           
=======================================
  Hits          259      259           
  Misses         26       26

---

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[ichizok]

By this patch, on Vim 8.0.1372 or later, coverage for migemo feature can be taken. However, Vim on Travis CI is older. So I cannot confirm this patch works. Did you try this patch with the Vim after 8.0.1372 and confirmed it works?

I confirmed only in my local. Would you like to add build-phase of latest Vim to CI (as with vital.vim) ?

[ichizok]

Homebrew macvim was updated to 8.0-143 (https://github.com/Homebrew/homebrew-core/commit/e84b6ac35e92aea912bf29ef2539483076f9973e) a few minutes ago.

[rhysd]

@ichizok Thank you for your fixes. Looks good. I'll check the result of merge commit to see if it works.