add test case

[tonytonyjan]

FYI

did_you_mean $ env TEST=test/edit_distance/jaro_winkler_test.rb rake test
/Users/tonytonyjan/.rbenv/versions/2.2.3/bin/ruby -w -I"lib:test"  "/Users/tonytonyjan/.rbenv/versions/2.2.3/lib/ruby/2.2.0/rake/rake_test_loader.rb" "test/edit_distance/jaro_winkler_test.rb"
Run options: --seed 58520

# Running:

.F

Finished in 0.001189s, 1681.4240 runs/s, 12610.6797 assertions/s.

  1) Failure:
JaroWinklerTest#test_jaro_winkler_distance [/Users/tonytonyjan/Dropbox/codes/gems/did_you_mean/test/edit_distance/jaro_winkler_test.rb:16]:
Expected: 1.0
  Actual: 0.0

2 runs, 15 assertions, 1 failures, 0 errors, 0 skips
rake aborted!
Command failed with status (1): [ruby -w -I"lib:test"  "/Users/tonytonyjan/.rbenv/versions/2.2.3/lib/ruby/2.2.0/rake/rake_test_loader.rb" "test/edit_distance/jaro_winkler_test.rb" ]

Tasks: TOP => test
(See full trace by running task with --trace)

[yuki24]

Thanks!