get_dir_and_leftover
before_each -> File.mkdir tmpdir / 'subdir'
assert.same {File.home_dir, ''}, {paths.get_dir_and_leftover ''}
returns the root directory for "/"
assert.same {File.home_dir.root_dir, ''}, {paths.get_dir_and_leftover '/'}
returns the matched path and unmatched parts of a path
assert.same {tmpdir, 'unmatched'}, {paths.get_dir_and_leftover tostring(tmpdir / 'unmatched')}
when given a directory path ending in "/", matches the given directory
assert.same {tmpdir / 'subdir', ''}, {paths.get_dir_and_leftover tostring(tmpdir)..'/subdir/'}
when given a directory path not ending in "/", matches the parent directory
assert.same {tmpdir, 'subdir'}, {paths.get_dir_and_leftover tostring(tmpdir)..'/subdir'}
unmatched part can contain slashes
assert.same {tmpdir, 'unmatched/no/such/file'}, {paths.get_dir_and_leftover tostring(tmpdir / 'unmatched/no/such/file')}
(is given a non absolute path)
uses the home dir as the base path
assert.same {File.home_dir, 'unmatched-asdf98y23903943masgb sdf'}, {paths.get_dir_and_leftover 'unmatched-asdf98y23903943masgb sdf'}
