1 files changed, 26 insertions, 0 deletions
diff --git a/test/rubygems/test_deprecate.rb b/test/rubygems/test_deprecate.rb
index 27f72431b0..e5e9350dc5 100644
--- a/test/rubygems/test_deprecate.rb
+++ b/test/rubygems/test_deprecate.rb
@@ -54,6 +54,20 @@ class TestDeprecate < Gem::TestCase
 
   end
 
+  class OtherThing
+
+    extend Gem::Deprecate
+    attr_accessor :message
+    def foo
+      @message = "foo"
+    end
+    def bar
+      @message = "bar"
+    end
+    deprecate :foo, :bar, 2099, 3
+
+  end
+
   def test_deprecated_method_calls_the_old_method
     capture_io do
       thing = Thing.new
@@ -91,4 +105,16 @@ class TestDeprecate < Gem::TestCase
     Gem::Commands.send(:remove_const, :FooCommand)
   end
 
+  def test_deprecated_method_outputs_a_warning_old_way
+    out, err = capture_io do
+      thing = OtherThing.new
+      thing.foo
+    end
+
+    assert_equal "", out
+    assert_match(/Gem::Deprecate#deprecate has been deprecated with no replacement and it will be removed in Rubygems 4\./, err)
+    assert_match(/Thing#foo is deprecated; use bar instead\./, err)
+    assert_match(/on or after 2099-03-01/, err)
+  end
+
 end