Enable to set value to memoized method externally

lib/memoist.rb

@@ -81,6 +81,11 @@ def flush_cache(*method_names)
         remove_instance_variable(ivar) if instance_variable_defined?(ivar)
       end
     end
+
+    def set_cache(method_name, value)
+      memoized_ivar = Memoist.memoized_ivar_for(method_name)
+      instance_variable_set(memoized_ivar, value)
+    end
   end
 
   def memoize(*method_names)

test/memoist_test.rb

@@ -331,4 +331,11 @@ def test_private_method_memoization
     assert_equal 1, person.is_developer_calls
   end
 
+  def test_memoization_with_custom_value
+    person = Person.new
+    person.set_cache(:is_developer?, "No")
+    assert_equal "No", person.send(:is_developer?)
+    assert_equal 0, person.is_developer_calls
+  end
+
 end