Fix a bug when an error is raised if label is called with just one ar…

…gument.

Signed-off-by: Justin French <justin@indent.com.au>

lib/formtastic.rb

@@ -315,7 +315,7 @@ def semantic_fields_for(record_or_name_or_array, *args, &block)
     # :required can be also sent as option. When true, marks a filed as required,
     # when false marks it as optional. When nil, does nothing.
     #
-    def label(method, text, options={}, as_span=false)
+    def label(method, text=nil, options={}, as_span=false)
       text ||= humanized_attribute_name(method)
       text  << required_or_optional_string(options.delete(:required))
 

spec/formtastic_spec.rb

@@ -286,6 +286,26 @@ def custom(arg1, arg2, options = {})
       end
     end
 
+    describe '#label' do
+      it 'should humanize the given attribute' do
+        semantic_form_for(@new_post) do |builder|
+          builder.label(:login).should have_tag('label', :with => /Login/)
+        end
+      end
+
+      it 'should append required note' do
+        semantic_form_for(@new_post) do |builder|
+          builder.label(:login, nil, :required => true).should have_tag('label abbr')
+        end
+      end
+
+      it 'should be printed as span' do
+        semantic_form_for(@new_post) do |builder|
+          builder.label(:login, nil, { :required => true }, true).should have_tag('span.label abbr')
+        end
+      end
+    end
+
     describe '#input' do
 
       before do