Adapt some of git's tests for git init.

[scouten]

Changes in This Pull Request

Review some of git's test suite. Mimic a few tests for the subset of git init that we implement in Xgit.Repository.OnDisk.create/1.

Checklist

• This PR represents a single feature, fix, or change.
• All applicable changes have been documented. n/a
• There is test coverage for all changes. n/a
• All cases where a literal value is returned use the cover macro to force code coverage. n/a
• Any code ported from jgit maintains all existing copyright and license notices. n/a
• If new files are ported from jgit, the path to the corresponding file(s) is included in the header comment. n/a
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment. n/a

[codecov]

Codecov Report

Merging #282 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #282   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          28     28           
  Lines        1456   1456           
=====================================
  Hits         1456   1456

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