1 files changed, 35 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/object/blank_test.rb b/activesupport/test/core_ext/object/blank_test.rb
new file mode 100644
index 0000000000..8a5e385dd7
--- /dev/null
+++ b/activesupport/test/core_ext/object/blank_test.rb
@@ -0,0 +1,35 @@
+
+require 'abstract_unit'
+require 'active_support/core_ext/object/blank'
+
+class BlankTest < ActiveSupport::TestCase
+  class EmptyTrue
+    def empty?
+      0
+    end
+  end
+
+  class EmptyFalse
+    def empty?
+      nil
+    end
+  end
+
+  BLANK = [ EmptyTrue.new, nil, false, '', '   ', "  \n\t  \r ", '　', "\u00a0", [], {} ]
+  NOT   = [ EmptyFalse.new, Object.new, true, 0, 1, 'a', [nil], { nil => 0 } ]
+
+  def test_blank
+    BLANK.each { |v| assert_equal true, v.blank?,  "#{v.inspect} should be blank" }
+    NOT.each   { |v| assert_equal false, v.blank?, "#{v.inspect} should not be blank" }
+  end
+
+  def test_present
+    BLANK.each { |v| assert_equal false, v.present?, "#{v.inspect} should not be present" }
+    NOT.each   { |v| assert_equal true, v.present?,  "#{v.inspect} should be present" }
+  end
+
+  def test_presence
+    BLANK.each { |v| assert_equal nil, v.presence, "#{v.inspect}.presence should return nil" }
+    NOT.each   { |v| assert_equal v,   v.presence, "#{v.inspect}.presence should return self" }
+  end
+end