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Merge #18305: test: Explain why test logging should be used

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ffff9dcdc3cbe427739cc19cc7a53f032474fa2a test: Explain why test logging should be used (MarcoFalke)

Pull request description:

  Background is that some tests don't have any `self.log` call at all. Thus there are no "anchor points" and those tests are hard to debug because the logs can't easily be parsed by a human.

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Tree-SHA512: 08d962e85c4892c2a0c58feb5dc697c680a9d68e41a79417da6fcd415e0c5c735c4533a985cf225bb89deb5ca717d9bedf990657958079185804caa512b10f5a
This commit is contained in:
MarcoFalke 2020-03-10 12:45:30 -04:00 committed by PastaPastaPasta
parent c2b4dd698c
commit 87de1bc7c7
2 changed files with 5 additions and 2 deletions
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2
test/README.md
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@ -157,7 +157,7 @@ levels using the logger included in the test_framework, e.g.
`test_framework.log` and no logs are output to the console.
- when run directly, *all* logs are written to `test_framework.log` and INFO
level and above are output to the console.
- when run on Travis, no logs are output to the console. However, if a test
- when run by [our CI (Continuous Integration)](/ci/README.md), no logs are output to the console. However, if a test
fails, the `test_framework.log` and dashd `debug.log`s will all be dumped
to the console to help troubleshooting.

5
test/functional/README.md
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@ -51,10 +51,13 @@ don't have test cases for.
#### General test-writing advice
- Instead of inline comments or no test documentation at all, log the comments to the test log, e.g.
`self.log.info('Create enough transactions to fill a block')`. Logs make the test code easier to read and the test
logic easier [to debug](/test/README.md#test-logging).
- Set `self.num_nodes` to the minimum number of nodes necessary for the test.
Having additional unrequired nodes adds to the execution time of the test as
well as memory/CPU/disk requirements (which is important when running tests in
parallel or on Travis).
parallel).
- Avoid stop-starting the nodes multiple times during the test if possible. A
stop-start takes several seconds, so doing it several times blows up the
runtime of the test.