adds more tests from microformats wiki

lib/microformats2/format.rb

@@ -37,8 +37,8 @@ module Microformats2
     def parse_implied_properties
       ip = []
       ip << ImpliedProperty::Name.new(@element).parse unless property_present?(:name)
-      ip << ImpliedProperty::Photo.new(@element).parse unless property_present?(:photo)
       ip << ImpliedProperty::Url.new(@element).parse unless property_present?(:url)
+      ip << ImpliedProperty::Photo.new(@element).parse unless property_present?(:photo)
       ip.compact.each do |property|
         save_property_name(property.method_name)
         define_method(property.method_name)

lib/microformats2/property/date_time.rb

@@ -2,9 +2,21 @@ module Microformats2
   module Property
     class DateTime < Foundation
       def value
-        ::DateTime.parse(super)
+        ::DateTime.parse(string_value)
       rescue ArgumentError => e
-        super
+        string_value
+      end
+
+      def string_value
+        @string_value ||= value_class_pattern || element_value || text_value
+      end
+
+      def to_hash
+        if formats.empty?
+          string_value.to_s
+        else
+          { value: string_value.to_s }.merge(formats.first.to_hash)
+        end
       end
 
       protected

lib/microformats2/property/foundation.rb

@@ -41,7 +41,7 @@ module Microformats2
       end
 
       def element_value
-        @element.attribute(attribute).to_s if attribute
+        @element.attribute(attribute).to_s if attribute && @element.attribute(attribute)
       end
 
       def text_value