Add tests for `File.extname`
* file.c (rb_file_s_extname): [DOC] add an example. * test/ruby/test_path.rb (test_extname): add tests. [Fix GH-978] * path starts with dot ('.a.rb') * path includes dir name ('a/b/d/test.rb') * path includes dir name and dir name starts with dot ('.a/b/d/test.rb') git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51359 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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