Index: list_format_test.rb
===================================================================
diff --git a/trunk/test/unit/lib/redmine/field_format/list_format_test.rb b/trunk/test/unit/lib/redmine/field_format/list_format_test.rb
--- a/trunk/test/unit/lib/redmine/field_format/list_format_test.rb	(revision 20121)
+++ b/trunk/test/unit/lib/redmine/field_format/list_format_test.rb	(working copy)
@@ -95,6 +95,47 @@
     end
   end
 
+  def test_edit_tag_should_include_blank_option_on_new_record
+    field = IssueCustomField.new(:field_format => 'list', :possible_values => ['Foo', 'Bar'], :is_required => true,
+      :multiple => false)
+    value = CustomFieldValue.new(:custom_field => field, :customized => Issue.new)
+
+    tag = field.format.edit_tag(self, 'id', 'name', value)
+    assert_select_in tag, 'select' do
+      assert_select 'option', 3
+      assert_select 'option[value=""]'
+      assert_select 'option[value=Foo]', :text => 'Foo'
+      assert_select 'option[value=Bar]', :text => 'Bar'
+    end
+  end
+
+  def test_edit_tag_should_not_include_blank_option_on_new_record_with_default_value
+    field = IssueCustomField.new(:field_format => 'list', :possible_values => ['Foo', 'Bar'], :is_required => true,
+      :multiple => false, :default_value => 'Bar')
+    value = CustomFieldValue.new(:custom_field => field, :customized => Issue.new)
+
+    tag = field.format.edit_tag(self, 'id', 'name', value)
+    assert_select_in tag, 'select' do
+      assert_select 'option', 2
+      assert_select 'option[value=Foo]', :text => 'Foo'
+      assert_select 'option[value=Bar]', :text => 'Bar'
+    end
+  end
+
+  def test_edit_tag_should_include_blank_option_on_persisted_record
+    field = IssueCustomField.new(:field_format => 'list', :possible_values => ['Foo', 'Bar'], :is_required => true,
+      :multiple => false, :default_value => 'Bar')
+    value = CustomFieldValue.new(:custom_field => field, :customized => Issue.generate!)
+
+    tag = field.format.edit_tag(self, 'id', 'name', value)
+    assert_select_in tag, 'select' do
+      assert_select 'option', 3
+      assert_select 'option[value=""]'
+      assert_select 'option[value=Foo]', :text => 'Foo'
+      assert_select 'option[value=Bar]', :text => 'Bar'
+    end
+  end
+
   def test_edit_tag_with_check_box_style_should_contain_possible_values
     field = IssueCustomField.new(:field_format => 'list', :possible_values => ['Foo', 'Bar'], :is_required => false,
       :edit_tag_style => 'check_box')