https://git.ruby-lang.org/ruby.git/commit/?id=a023db49bf

From a023db49bfbbbe119638bae6abf8113f0de371de Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 3 Jun 2021 12:26:52 +0900
Subject: Assertions for duplicate literal hash key warnings

---
 test/ruby/test_literal.rb | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/test/ruby/test_literal.rb b/test/ruby/test_literal.rb
index 679af20..10cb09b 100644
--- a/test/ruby/test_literal.rb
+++ b/test/ruby/test_literal.rb
@@ -461,17 +461,30 @@ class TestRubyLiteral < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_literal.rb#L461
 
   def test_hash_duplicated_key
     h = EnvUtil.suppress_warning do
-      eval <<~end
+      eval "#{<<-"begin;"}\n#{<<-'end;'}"
+      begin;
         # This is a syntax that renders warning at very early stage.
         # eval used to delay warning, to be suppressible by EnvUtil.
         {"a" => 100, "b" => 200, "a" => 300, "a" => 400}
-      end
+      end;
     end
     assert_equal(2, h.size)
     assert_equal(400, h['a'])
     assert_equal(200, h['b'])
     assert_nil(h['c'])
     assert_equal(nil, h.key('300'))
+
+    assert_all_assertions_foreach(
+      "duplicated literal key",
+      ':foo',
+      '"a"',
+      '1000',
+      '1.0',
+    ) do |key|
+      assert_warning(/key #{Regexp.quote(eval(key).inspect)} is duplicated/) do
+        eval("{#{key} => :bar, #{key} => :foo}")
+      end
+    end
   end
 
   def test_hash_frozen_key_id
-- 
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