1 files changed, 21 insertions, 0 deletions
diff --git a/activesupport/test/testing/deprecation_test.rb b/activesupport/test/testing/deprecation_test.rb
new file mode 100644
index 0000000000..e3c07aab8a
--- /dev/null
+++ b/activesupport/test/testing/deprecation_test.rb
@@ -0,0 +1,21 @@
+require 'abstract_unit'
+require 'active_support/deprecation'
+
+class DeprecationTestingTest < ActiveSupport::TestCase
+  def setup
+    @klass = Class.new do
+      def new_method; "abc" end
+      alias_method :old_method, :new_method
+    end
+  end
+
+  def test_assert_deprecated_raises_when_method_not_deprecated
+    assert_raises(Minitest::Assertion) { assert_deprecated { @klass.new.old_method } }
+  end
+
+  def test_assert_not_deprecated
+    ActiveSupport::Deprecation.deprecate_methods(@klass, :old_method => :new_method)
+
+    assert_raises(Minitest::Assertion) { assert_not_deprecated { @klass.new.old_method } }
+  end
+end