Rakefile in assert_value-1.5.2 vs Rakefile in assert_value-1.5.3

@@ -14,9 +14,10 @@
 
 desc 'Test assert_value.'
 Rake::TestTask.new(:test) do |t|
   t.libs << 'lib'
   t.pattern = 'test/**/*_test.rb'
+  t.warning = true
   t.verbose = true
 end
 
 if defined?(RSpec)
   desc "Run the specs."