Add tests and documentation for allow_blank. Closes #10651 [blj]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8733 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 8 insertions, 0 deletions

diff --git a/activerecord/test/cases/validations_test.rb b/activerecord/test/cases/validations_test.rb
index 34caf0e67e..bf79521cca 100755
--- a/activerecord/test/cases/validations_test.rb
+++ b/activerecord/test/cases/validations_test.rb
@@ -489,6 +489,14 @@ class ValidationsTest < ActiveRecord::TestCase
     assert_raise(ArgumentError) { Topic.validates_format_of(:title, :content) }
   end
 
+  def test_validate_format_with_allow_blank
+    Topic.validates_format_of(:title, :with => /^Validation\smacros \w+!$/, :allow_blank=>true)
+    assert !Topic.create("title" => "Shouldn't be valid").valid?
+    assert Topic.create("title" => "").valid?
+    assert Topic.create("title" => nil).valid?
+    assert Topic.create("title" => "Validation macros rule!").valid?
+  end
+
   # testing ticket #3142
   def test_validate_format_numeric
     Topic.validates_format_of(:title, :content, :with => /^[1-9][0-9]*$/, :message => "is bad data")