GH-15672: Tomas Fryda suggested instead of changing every test, the c…

…hange should be made in standalone test. He provides the code and I just copied and pasted. (#15675)

h2o-py/tests/pyunit_utils/utilsPY.py

@@ -687,7 +687,17 @@ def standalone_test(test, init_options={}):
  h2o.log_and_echo("STARTING TEST "+test.__name__)
  h2o.log_and_echo("")
  h2o.log_and_echo("------------------------------------------------------------")
- test()
+ import os
+ import tempfile
+ with tempfile.TemporaryDirectory() as dir: # Create a temporary dir that will clean itself
+ tempfile._once_lock.acquire() # Better lock to avoid race conditions (but since we don't test in multiple threads (to avoid side-effects on the backend) it should not matter)
+ old_tempdir = tempfile.tempdir
+ try:
+ tempfile.tempdir = dir # Tell tempfile to use this temporary dir as the root for all other temporary dirs
+ test()
+ finally:
+ tempfile.tempdir = old_tempdir
+ tempfile._once_lock.release()
 
 def run_tests(tests, run_in_isolation=True, init_options={}):
  #flatten in case of nested tests/test suites

h2o-py/tests/testdir_algos/gam/pyunit_PUBDEV_8136_check_gamX_saved_serialization.py

@@ -7,7 +7,6 @@
 import tempfile
 import os
 
-
 # Check and make sure transformed gam frame is correctedly saved with h2o.save_moddel
 def test_gam_transformed_frame_serialization():
  h2o_data = h2o.import_file(