fixed #738: consolidated stats into stat tests

[oleksii-polovyi]

For some reason we have both https://github.com/filerjs/filer/blob/master/tests/spec/fs.stats.spec.js and https://github.com/filerjs/filer/blob/master/tests/spec/fs.stat.spec.js. We should probably just have https://github.com/filerjs/filer/blob/master/tests/spec/fs.stat.spec.js, since there is no stats method.

Let's move the stats tests into stat, and make sure we aren't duplicating any tests.

• Consolidated stats into stat tests
• Ensured that there aren't any duplicating tests

[codecov-io]

Codecov Report

Merging #743 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #743   +/-   ##
======================================
  Coverage    86.6%   86.6%           
======================================
  Files          16      16           
  Lines        1739    1739           
======================================
  Hits         1506    1506           
  Misses        233     233

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[humphd]

Great stuff, thanks again.