Merge #10681: add gdb attach process to test README

7ec3343 add gdb attach process to test README (Gregory Sanders)

Pull request description:

  Saved me many hours. h/t to @jnewbery for the new guide efforts

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MarcoFalke 2017-07-19 22:45:22 +02:00 committed by Pasta
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@ -155,6 +155,26 @@ import pdb; pdb.set_trace()
anywhere in the test. You will then be able to inspect variables, as well as
call methods that interact with the dashd nodes-under-test.
If further introspection of the bitcoind instances themselves becomes
necessary, this can be accomplished by first setting a pdb breakpoint
at an appropriate location, running the test to that point, then using
`gdb` to attach to the process and debug.
For instance, to attach to `self.node[1]` during a run:
```bash
2017-06-27 14:13:56.686000 TestFramework (INFO): Initializing test directory /tmp/user/1000/testo9vsdjo3
```
use the directory path to get the pid from the pid file:
```bash
cat /tmp/user/1000/testo9vsdjo3/node1/regtest/bitcoind.pid
gdb /home/example/bitcoind <pid>
```
Note: gdb attach step may require `sudo`
### Util tests
Util tests can be run locally by running `test/util/bitcoin-util-test.py`.