tests: use proctutil.stdout.write() instead of print() in test-extension.t
I was debugging this test failure on python3 + chg. I get the following hunk as
test failure:
```
@@ -206,6 +206,18 @@ Check normal command's load order of ext
4) bar uipopulate
5) foo reposetup
5) bar reposetup
+ 4) foo uipopulate (chg !)
+ 4) bar uipopulate (chg !)
+ 4) foo uipopulate (chg !)
+ 4) bar uipopulate (chg !)
+ 4) foo uipopulate (chg !)
+ 4) bar uipopulate (chg !)
+ 4) foo uipopulate (chg !)
+ 4) bar uipopulate (chg !)
+ 4) foo uipopulate (chg !)
+ 4) bar uipopulate (chg !)
+ 5) foo reposetup (chg !)
+ 5) bar reposetup (chg !)
0:
c24b9ac61126
```
After hours of debugging and head scracthing, I figured out that something is
wrong with output flushing. I initially switched the print() statements to
ui.warn() but thanks to Yuya who suggested using procutil.stdout.write()
instead.
from __future__ import absolute_import
from mercurial.i18n import _
from mercurial import (
hg,
registrar,
)
cmdtable = {}
command = registrar.command(cmdtable)
@command(b'getflogheads', [], b'path')
def getflogheads(ui, repo, path):
"""
Extension printing a remotefilelog's heads
Used for testing purpose
"""
dest = repo.ui.expandpath(b'default')
peer = hg.peer(repo, {}, dest)
flogheads = peer.x_rfl_getflogheads(path)
if flogheads:
for head in flogheads:
ui.write(head + b'\n')
else:
ui.write(_(b'EMPTY\n'))