fa37e0a68bea65979f9f8f2e5258fe608acf2bdf test: Show debug log on unit test failure (MarcoFalke)
Pull request description:
Often, it is hard to debug unit test failures without the debug log. Especially when the failure happens remotely (e.g. on a ci system).
Fix that by printing the log on failure.
ACKs for top commit:
jamesob:
ACK fa37e0a68bea65979f9f8f2e5258fe608acf2bdf ([`jamesob/ackr/16975.1.MarcoFalke.test_show_debug_log_on_u`](https://github.com/jamesob/bitcoin/tree/ackr/16975.1.MarcoFalke.test_show_debug_log_on_u))
Tree-SHA512: 2ca4150c4ae3d4ad47e03b5e5e70da2baffec928ddef1fdf53a3ebc061f14aee249205387cb1b12ef6d4eb55711ef0080c0b41d9d18000b5da124ca80299793b