Rename test_hash to test_hash_uniqueness

Author: peterzhu2118

test/ruby/test_proc.rb

@@ -159,7 +159,7 @@ def test_eq
     assert_equal(*m_nest{}, "[ruby-core:84583] Feature #14627")
   end
 
-  def test_hash
+  def test_hash_uniqueness
     def self.capture(&block)
       block
     end