1 files changed, 16 insertions, 0 deletions
diff --git a/spec/ruby/core/kernel/trust_spec.rb b/spec/ruby/core/kernel/trust_spec.rb
index 1d209ea1dc..399983f74d 100644
--- a/spec/ruby/core/kernel/trust_spec.rb
+++ b/spec/ruby/core/kernel/trust_spec.rb
@@ -24,4 +24,20 @@ describe "Kernel#trust" do
       o.trust.should equal(o)
     end
   end
+
+  ruby_version_is "2.7"..."3.0" do
+    it "is a no-op" do
+      o = Object.new.untrust
+      o.should_not.untrusted?
+      o.trust
+      o.should_not.untrusted?
+    end
+
+    it "warns in verbose mode" do
+      -> {
+        o = Object.new.untrust
+        o.trust
+      }.should complain(/Object#trust is deprecated and will be removed in Ruby 3.2/, verbose: true)
+    end
+  end
 end