[pytest] Randomize tests order when using -t (closes #295922)

To help spot tests that are not fully independent of one another.

1 files changed, 4 insertions, 1 deletions

diff --git a/logilab/common/pytest.py b/logilab/common/pytest.py
index c0983ed..3d8aca3 100644
--- a/logilab/common/pytest.py
+++ b/logilab/common/pytest.py
@@ -120,6 +120,7 @@ import warnings
 import types
 from inspect import isgeneratorfunction, isclass
 from contextlib import contextmanager
+from random import shuffle
 
 from logilab.common.fileutils import abspath_listdir
 from logilab.common import textutils
@@ -391,7 +392,9 @@ class PyTester(object):
         return true when all tests has been executed, false if exitfirst and
         some test has failed.
         """
-        for filename in abspath_listdir(testdir):
+        files = abspath_listdir(testdir)
+        shuffle(files)
+        for filename in files:
             if this_is_a_testfile(filename):
                 if self.options.exitfirst and not self.options.restart:
                     # overwrite restart file