test that :smarty_streets interprets zipcode results

test/unit/lookups/smarty_streets_test.rb

@@ -37,6 +37,7 @@ class SmartyStreetsTest < GeocoderTestCase
     assert_equal "1703", result.zip4
     assert_equal "New York", result.city
     assert_equal "36061", result.fips
+    assert !result.zipcode_result?
   end
 
   def test_smarty_streets_result_components_with_zipcode_only_query
@@ -44,6 +45,7 @@ class SmartyStreetsTest < GeocoderTestCase
     assert_equal "Brooklyn", result.city
     assert_equal "New York", result.state
     assert_equal "NY", result.state_code
+    assert result.zipcode_result?
   end
 
   def test_no_results