How to test `OpenSSL::SSL::SSLContext#add_certificate`?

The documentation for SSLContext states that the #key= and #cert= writer methods are deprecated and to instead use #add_certificate. However, I noticed there does not seem to be a way to inspect the added key and cert objects? Both #key and #cert both return nil after calling #add_certificate.

Steps To Reproduce

key = OpenSSL::PKey::RSA.new(File.read('ssl.key'))
cert = OpenSSL::X509::Certificate.new(File.read('ssl.crt'))

context = OpenSSL::SSL::SSLContext.new
context.add_certificate(cert,key)
p context.key
p context.cert

Expected Results

#<OpenSSL::PKey::RSA: ...>
#<OpenSSL::X509::Certificate: ...>

Actual Results

nil
nil

Version

• ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]
• openssl (default: 3.0.0)

Start by running the provided Ruby reproduction with OpenSSL::SSL::SSLContext#add_certificate, then compare the results of #key and #cert with the documented deprecated writers. Trace the SSLContext API behavior and determine whether inspection should work or whether the documentation should explain the nil results; update the relevant tests or documentation accordingly.