The error message for client certificate failures changed in Go 1.25.
Update tests to check for both the old ("bad certificate") and new
("handshake failure") error strings to support multiple Go versions.
Signed-off-by: Mikel Olasagasti Uranga <mikel@olasagasti.info>
* Run tests on Go 1.21
For the most part, there are no breaking changes.
However, the expired certificate is now showing "expired certificate"
although previously it showed a simpler "bad certificate" which was
hard-coded into the TLS settings test scenario.
* Simplify condition for certificate error
Instead of two `expired certificate` and `bad certificate` comparisons, we can just check for `certificate` in error output. This satisfies us when checking there is something wrong with the certificate.
Co-authored-by: Scott Blum <dragonsinth@gmail.com>
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Co-authored-by: Scott Blum <dragonsinth@gmail.com>
