tests/run-multitests.py: Switch to PYCOPYPATH envvar.
@@ -404,7 +404,7 @@ def main():
cmd_args = cmd_parser.parse_args()
# clear search path to make sure tests use only builtin modules and those in extmod
- os.environ["MICROPYPATH"] = os.pathsep + "../extmod"
+ os.environ["PYCOPYPATH"] = os.pathsep + "../extmod"
test_files = prepare_test_file_list(cmd_args.files)
max_instances = max(t[1] for t in test_files)
