Compare class name as string.

Tests were failing like this:
  <Geocoder::Result::Nominatim> expected but was
  <"Geocoder::Result::Nominatim">

test/unit/geocoder_test.rb

@@ -60,18 +60,18 @@ class GeocoderTest < GeocoderTestCase
   def test_geocode_with_custom_lookup_param
     v = PlaceWithCustomLookup.new(*geocoded_object_params(:msg))
     v.geocode
-    assert_equal Geocoder::Result::Nominatim, v.result_class
+    assert_equal "Geocoder::Result::Nominatim", v.result_class.to_s
   end
 
   def test_geocode_with_custom_lookup_proc_param
     v = PlaceWithCustomLookupProc.new(*geocoded_object_params(:msg))
     v.geocode
-    assert_equal Geocoder::Result::Nominatim, v.result_class
+    assert_equal "Geocoder::Result::Nominatim", v.result_class.to_s
   end
 
   def test_reverse_geocode_with_custom_lookup_param
     v = PlaceReverseGeocodedWithCustomLookup.new(*reverse_geocoded_object_params(:msg))
     v.reverse_geocode
-    assert_equal Geocoder::Result::Nominatim, v.result_class
+    assert_equal "Geocoder::Result::Nominatim", v.result_class.to_s
   end
 end