1 files changed, 25 insertions, 0 deletions
diff --git a/test/openssl/test_pair.rb b/test/openssl/test_pair.rb
index a8df74d821..cd5d5d8959 100644
--- a/test/openssl/test_pair.rb
+++ b/test/openssl/test_pair.rb
@@ -283,6 +283,31 @@ module OpenSSL::TestPairM
     serv.close if serv && !serv.closed?
   end
 
+  def test_connect_works_when_setting_dh_callback_to_nil
+    ctx2 = OpenSSL::SSL::SSLContext.new
+    ctx2.ciphers = "DH"
+    ctx2.tmp_dh_callback = nil
+    sock1, sock2 = tcp_pair
+    s2 = OpenSSL::SSL::SSLSocket.new(sock2, ctx2)
+    accepted = s2.accept_nonblock(exception: false)
+
+    ctx1 = OpenSSL::SSL::SSLContext.new
+    ctx1.ciphers = "DH"
+    ctx1.tmp_dh_callback = nil
+    s1 = OpenSSL::SSL::SSLSocket.new(sock1, ctx1)
+    t = Thread.new { s1.connect }
+
+    accept = s2.accept
+    assert_equal s1, t.value
+    assert accept
+  ensure
+    s1.close if s1
+    s2.close if s2
+    sock1.close if sock1
+    sock2.close if sock2
+    accepted.close if accepted.respond_to?(:close)
+  end
+
   def test_connect_without_setting_dh_callback
     ctx2 = OpenSSL::SSL::SSLContext.new
     ctx2.ciphers = "DH"