tests: print the server error log in `test-url-download.t`
There was a stray 500 error in CI, but no additional context to know what the
issue was.
https://foss.heptapod.net/octobus/mercurial-devel/-/jobs/163093
Differential Revision: https://phab.mercurial-scm.org/D9949
--- a/tests/test-url-download.t Tue Feb 02 15:35:58 2021 +0100
+++ b/tests/test-url-download.t Tue Feb 02 10:56:53 2021 -0500
@@ -34,6 +34,8 @@
$ hg debugdownload ./null.txt
1 0000000000000000000000000000000000000000
+ $ cat ../error.log
+
Test largefile URL
------------------
@@ -66,3 +68,5 @@
$ hg debugdownload "largefile://a57b57b39ee4dc3da1e03526596007f480ecdbe8"
1 0000000000000000000000000000000000000000
$ cd ..
+
+ $ cat error.log