Failing test to show problem when last argument of a memoized method is true

Signed-off-by: NDamien Mathieu <42@dmathieu.com>

activesupport/test/memoizable_test.rb

@@ -96,6 +96,15 @@ def fib(n)
     end
     memoize :fib
 
+    def add_or_subtract(i, j, add)
+      if add
+        i + j
+      else
+        i - j
+      end
+    end
+    memoize :add_or_subtract
+
     def counter
       @count ||= 0
       @count += 1
@@ -199,6 +208,11 @@ def test_reloadable_with_args
     assert_equal 13, @calculator.fib_calls
   end
 
+  def test_memoization_with_boolean_arg
+    assert_equal 4, @calculator.add_or_subtract(2, 2, true)
+    assert_equal 2, @calculator.add_or_subtract(4, 2, false)
+  end
+
   def test_object_memoization
     [Company.new, Company.new, Company.new].each do |company|
       company.extend ActiveSupport::Memoizable