# HG changeset patch
# User Matt Harbison <matt_harbison@yahoo.com>
# Date 1497838794 14400
# Node ID bd77ac2bd23ab5ba10e5c69a1453b40475142c33
# Parent  23b07333a8b2a143486f22ada1606a7d225793a8
run-tests: explicitly flush test runner output for Windows stability

When hghave testing goes awry, the output order was changing on Windows.

  diff --git a/tests/test-run-tests.t b/tests/test-run-tests.t
  --- a/tests/test-run-tests.t
  +++ b/tests/test-run-tests.t
  @@ -920,10 +920,10 @@
      > EOF
      > done
      $ rt -j 2
  -  ....
  +  ....skipped: unknown feature: notarealhghavefeature\r (esc)
  +
  +
      # Ran 5 tests, 0 skipped, 0 warned, 0 failed.
  -  skipped: unknown feature: notarealhghavefeature
  -
      $ cd ..
      $ rm -rf broken

Since 'skipped: unknown feature: notarealhghavefeature\n\n' is printed to stdout
and the rest to stderr, it seems like maybe stdio isn't line buffered on
Windows.  When a program exits, stdout is flushed before stderr[1].

[1] https://blogs.msdn.microsoft.com/oldnewthing/20060519-09/?p=31133

diff -r 23b07333a8b2 -r bd77ac2bd23a tests/run-tests.py
--- a/tests/run-tests.py	Sun Jun 18 21:31:53 2017 -0400
+++ b/tests/run-tests.py	Sun Jun 18 22:19:54 2017 -0400
@@ -2010,6 +2010,7 @@
                     os.environ['PYTHONHASHSEED'])
             if self._runner.options.time:
                 self.printtimes(result.times)
+            self.stream.flush()
 
         return result