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-rw-r--r--activesupport/test/core_ext/kernel/concern_test.rb12
1 files changed, 12 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/kernel/concern_test.rb b/activesupport/test/core_ext/kernel/concern_test.rb
new file mode 100644
index 0000000000..9b1fdda3b0
--- /dev/null
+++ b/activesupport/test/core_ext/kernel/concern_test.rb
@@ -0,0 +1,12 @@
+require 'abstract_unit'
+require 'active_support/core_ext/kernel/concern'
+
+class KernelConcernTest < ActiveSupport::TestCase
+ def test_may_be_defined_at_toplevel
+ mod = ::TOPLEVEL_BINDING.eval 'concern(:ToplevelConcern) { }'
+ assert_equal mod, ::ToplevelConcern
+ assert_kind_of ActiveSupport::Concern, ::ToplevelConcern
+ assert !Object.ancestors.include?(::ToplevelConcern), mod.ancestors.inspect
+ Object.send :remove_const, :ToplevelConcern
+ end
+end