1 files changed, 15 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/untrust_spec.rb b/spec/ruby/core/kernel/untrust_spec.rb
index fca7c9ea47..aff0fec57b 100644
--- a/spec/ruby/core/kernel/untrust_spec.rb
+++ b/spec/ruby/core/kernel/untrust_spec.rb
@@ -24,4 +24,19 @@ describe "Kernel#untrust" do
       o.untrust.should equal(o)
     end
   end
+
+  ruby_version_is "2.7"..."3.0" do
+    it "is a no-op" do
+      o = Object.new
+      o.untrust
+      o.should_not.untrusted?
+    end
+
+    it "warns in verbose mode" do
+      -> {
+        o = Object.new
+        o.untrust
+      }.should complain(/Object#untrust is deprecated and will be removed in Ruby 3.2/, verbose: true)
+    end
+  end
 end