[ruby/psych] Make Ractor-ready.

Config is Ractor-local.

Benchmarking reveals that using `Ractor.local_storage` for storing cache
is similar to accessing a constant (~15% slower).

1 files changed, 47 insertions, 0 deletions

diff --git a/test/psych/test_ractor.rb b/test/psych/test_ractor.rb
new file mode 100644
index 0000000..90e4036
--- /dev/null
+++ b/test/psych/test_ractor.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+require_relative 'helper'
+
+class TestPsychRactor < Test::Unit::TestCase
+  def test_ractor_round_trip
+    assert_ractor(<<~RUBY, require_relative: 'helper')
+      obj = {foo: [42]}
+      obj2 = Ractor.new(obj) do |obj|
+        Psych.load(Psych.dump(obj))
+      end.take
+      assert_equal obj, obj2
+    RUBY
+  end
+
+  def test_not_shareable
+    # There's no point in making these frozen / shareable
+    # and the C-ext disregards begin frozen
+    assert_ractor(<<~RUBY, require_relative: 'helper')
+      parser = Psych::Parser.new
+      emitter = Psych::Emitter.new(nil)
+      assert_raise(Ractor::Error) { Ractor.make_shareable(parser) }
+      assert_raise(Ractor::Error) { Ractor.make_shareable(emitter) }
+    RUBY
+  end
+
+  def test_ractor_config
+    assert_ractor(<<~RUBY, require_relative: 'helper')
+      r = Ractor.new do
+        Psych.add_builtin_type 'omap' do |type, val|
+          val * 2
+        end
+        Psych.load('--- !!omap hello')
+      end.take
+      assert_equal 'hellohello', r
+      assert_equal 'hello', Psych.load('--- !!omap hello')
+    RUBY
+  end
+
+  def test_ractor_constants
+    assert_ractor(<<~RUBY, require_relative: 'helper')
+      r = Ractor.new do
+        Psych.libyaml_version.join('.') == Psych::LIBYAML_VERSION
+      end.take
+      assert_equal true, r
+    RUBY
+  end
+end