New assertion: assert_present [#4299 state:committed]

Signed-off-by: Xavier Noria <fxn@hashref.com>

activesupport/lib/active_support/testing/assertions.rb

@@ -69,6 +69,13 @@ def assert_no_difference(expression, message = nil, &block)
       def assert_blank(object)
         assert object.blank?, "#{object.inspect} is not blank"
       end
+
+      # Test if an expression is not blank. Passes if object.present? is true.
+      #
+      #   assert_present {:data => 'x' } # => true
+      def assert_present(object)
+        assert object.present?, "#{object.inspect} is blank"
+      end
     end
   end
 end

activesupport/test/test_test.rb

@@ -96,7 +96,7 @@ def empty?() false; end
 
 class AssertBlankTest < ActiveSupport::TestCase
   BLANK = [ EmptyTrue.new, nil, false, '', '   ', "  \n\t  \r ", [], {} ]
-  NOT_BLANK   = [ EmptyFalse.new, Object.new, true, 0, 1, 'j', [nil], { nil => 0 } ]
+  NOT_BLANK = [ EmptyFalse.new, Object.new, true, 0, 1, 'x', [nil], { nil => 0 } ]
 
   def test_assert_blank_true
     BLANK.each { |v| assert_blank v }
@@ -114,6 +114,26 @@ def test_assert_blank_false
   end
 end
 
+class AssertPresentTest < ActiveSupport::TestCase
+  BLANK = [ EmptyTrue.new, nil, false, '', '   ', "  \n\t  \r ", [], {} ]
+  NOT_BLANK = [ EmptyFalse.new, Object.new, true, 0, 1, 'x', [nil], { nil => 0 } ]
+
+  def test_assert_blank_true
+    NOT_BLANK.each { |v| assert_present v }
+  end
+
+  def test_assert_blank_false
+    BLANK.each { |v|
+      begin 
+        assert_present v
+        fail 'should not get to here'
+      rescue Exception => e
+        assert_match(/is blank/, e.message) 
+      end  
+    }
+  end
+end
+
 # These should always pass
 if ActiveSupport::Testing.const_defined?(:Default)
   class NotTestingThingsTest < Test::Unit::TestCase