Rename test case when there is no country in the yandex results

test/unit/lookups/yandex_test.rb

@@ -14,7 +14,7 @@ class YandexTest < GeocoderTestCase
       result.viewport
   end
 
-  def test_yandex_empty_results
+  def test_yandex_no_country_in_results
     result = Geocoder.search('black sea').first
     assert_equal "", result.country_code
     assert_equal "", result.country