From 7cfe93c028fbf7aa0022ca8a4ac6a66d0103337a Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@ruby-lang.org>
Date: Mon, 6 Jan 2020 18:22:43 +0900
Subject: hash.c: Add a feature to manipulate ruby2_keywords flag

It was found that a feature to check and add ruby2_keywords flag to an
existing Hash is needed when arguments are serialized and deserialized.
It is possible to do the same without explicit APIs, but it would be
good to provide them as a core feature.

https://github.com/rails/rails/pull/38105#discussion_r361863767

Hash.ruby2_keywords_hash?(hash) checks if hash is flagged or not.
Hash.ruby2_keywords_hash(hash) returns a duplicated hash that has a
ruby2_keywords flag,

[Bug #16486]
---
 test/ruby/test_hash.rb | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'test/ruby/test_hash.rb')

diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index ef32cff868..2c449739f1 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -1756,4 +1756,28 @@ class TestHash < Test::Unit::TestCase
       super
     end
   end
+
+  ruby2_keywords def get_flagged_hash(*args)
+    args.last
+  end
+
+  def check_flagged_hash(k: :NG)
+    k
+  end
+
+  def test_ruby2_keywords_hash?
+    flagged_hash = get_flagged_hash(k: 1)
+    assert_equal(true, Hash.ruby2_keywords_hash?(flagged_hash))
+    assert_equal(false, Hash.ruby2_keywords_hash?({}))
+    assert_raise(TypeError) { Hash.ruby2_keywords_hash?(1) }
+  end
+
+  def test_ruby2_keywords_hash!
+    hash = {k: 1}
+    assert_equal(false, Hash.ruby2_keywords_hash?(hash))
+    hash = Hash.ruby2_keywords_hash(hash)
+    assert_equal(true, Hash.ruby2_keywords_hash?(hash))
+    assert_equal(1, check_flagged_hash(*[hash]))
+    assert_raise(TypeError) { Hash.ruby2_keywords_hash(1) }
+  end
 end
-- 
cgit v1.2.3