[ruby/pp] Ensure the thread local state is always set up.

(https://github.com/ruby/pp/pull/38)

https://github.com/ruby/pp/commit/5b5d483ac2

1 files changed, 16 insertions, 0 deletions

diff --git a/test/test_pp.rb b/test/test_pp.rb
index 2646846d8b..c71445c9bc 100644
--- a/test/test_pp.rb
+++ b/test/test_pp.rb
@@ -243,6 +243,22 @@ class PPSingleLineTest < Test::Unit::TestCase
     assert_equal("[{}]", PP.singleline_pp([->(*a){a.last.clear}.ruby2_keywords.call(a: 1)], ''.dup))
     assert_equal("[{}]", PP.singleline_pp([Hash.ruby2_keywords_hash({})], ''.dup))
   end
+
+  def test_direct_pp
+    buffer = String.new
+
+    a = []
+    a << a
+
+    # Isolate the test from any existing Thread.current[:__recursive_key__][:inspect].
+    Thread.new do
+      q = PP::SingleLine.new(buffer)
+      q.pp(a)
+      q.flush
+    end.join
+
+    assert_equal("[[...]]", buffer)
+  end
 end
 
 class PPDelegateTest < Test::Unit::TestCase