From f26e89c4a76b628d36b8389a4c9462de97cf4f12 Mon Sep 17 00:00:00 2001
From: John Bachir <j@jjb.cc>
Date: Tue, 4 Jul 2023 15:45:28 -0400
Subject: [PATCH] [ruby/timeout] nested exception tests for discussion

https://github.com/ruby/timeout/commit/3e42aa4d84
---
 test/test_timeout.rb | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/test/test_timeout.rb b/test/test_timeout.rb
index 0a8dc45cc3..27b34de454 100644
--- a/test/test_timeout.rb
+++ b/test/test_timeout.rb
@@ -63,6 +63,42 @@ class TestTimeout < Test::Unit::TestCase
     assert_nil a
   end
 
+  class MyNewErrorOuter < StandardError; end
+  class MyNewErrorInner < StandardError; end
+
+  # DOES NOT fail with
+  # -        raise new(message) if exc.equal?(e)
+  # +        raise new(message) if exc.class == e.class
+  def test_nested_timeout_error_identity
+    begin
+      Timeout.timeout(0.1, MyNewErrorOuter) {
+        Timeout.timeout(1, MyNewErrorInner) {
+          nil while true
+        }
+      }
+    rescue => e
+      assert e.class == MyNewErrorOuter
+    end
+  end
+
+  # DOES fail with
+  # -        raise new(message) if exc.equal?(e)
+  # +        raise new(message) if exc.class == e.class
+  def test_nested_timeout_which_error_bubbles_up
+    raised_exception = nil
+    begin
+      Timeout.timeout(0.1) {
+        Timeout.timeout(1) {
+          raise Timeout::ExitException.new("inner message")
+        }
+      }
+    rescue Exception => e
+      raised_exception = e
+    end
+
+    assert_equal 'inner message', e.message
+  end
+
   def test_cannot_convert_into_time_interval
     bug3168 = '[ruby-dev:41010]'
     def (n = Object.new).zero?; false; end