diff --git a/beat/backend/python/test/prefix/algorithms/autonomous/loop/1.json b/beat/backend/python/test/prefix/algorithms/autonomous/loop/1.json
new file mode 100644
index 0000000000000000000000000000000000000000..65181c1c98d42e73399ed1f793bf21d210ee38eb
--- /dev/null
+++ b/beat/backend/python/test/prefix/algorithms/autonomous/loop/1.json
@@ -0,0 +1,21 @@
+{
+ "schema_version": 2,
+ "language": "python",
+ "api_version": 2,
+ "type": "loop",
+ "splittable": false,
+ "groups": [
+ {
+ "inputs": {
+ "in": {
+ "type": "user/single_integer/1"
+ }
+ },
+ "outputs": {
+ "out": {
+ "type": "user/single_integer/1"
+ }
+ }
+ }
+ ]
+}
diff --git a/beat/backend/python/test/prefix/algorithms/autonomous/loop/1.py b/beat/backend/python/test/prefix/algorithms/autonomous/loop/1.py
new file mode 100644
index 0000000000000000000000000000000000000000..4406e7ecd9c7fed72286b72b59c1fcea520b726b
--- /dev/null
+++ b/beat/backend/python/test/prefix/algorithms/autonomous/loop/1.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+# vim: set fileencoding=utf-8 :
+
+###############################################################################
+# #
+# Copyright (c) 2018 Idiap Research Institute, http://www.idiap.ch/ #
+# Contact: beat.support@idiap.ch #
+# #
+# This file is part of the beat.backend.python module of the BEAT platform. #
+# #
+# Commercial License Usage #
+# Licensees holding valid commercial BEAT licenses may use this file in #
+# accordance with the terms contained in a written agreement between you #
+# and Idiap. For further information contact tto@idiap.ch #
+# #
+# Alternatively, this file may be used under the terms of the GNU Affero #
+# Public License version 3 as published by the Free Software and appearing #
+# in the file LICENSE.AGPL included in the packaging of this file. #
+# The BEAT platform is distributed in the hope that it will be useful, but #
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY #
+# or FITNESS FOR A PARTICULAR PURPOSE. #
+# #
+# You should have received a copy of the GNU Affero Public License along #
+# with the BEAT platform. If not, see http://www.gnu.org/licenses/. #
+# #
+###############################################################################
+
+class Algorithm:
+
+ def validate(self, result):
+ value = int(result)
+
+ return value < 6
diff --git a/beat/backend/python/test/prefix/algorithms/autonomous/loop_user/1.json b/beat/backend/python/test/prefix/algorithms/autonomous/loop_user/1.json
new file mode 100644
index 0000000000000000000000000000000000000000..43f7a57b22cfc5b4b94df6cbf93f27d1f37202e1
--- /dev/null
+++ b/beat/backend/python/test/prefix/algorithms/autonomous/loop_user/1.json
@@ -0,0 +1,21 @@
+{
+ "schema_version": 2,
+ "language": "python",
+ "api_version": 2,
+ "type": "autonomous",
+ "splittable": false,
+ "groups": [
+ {
+ "inputs": {
+ "in": {
+ "type": "user/single_integer/1"
+ }
+ },
+ "outputs": {
+ "out": {
+ "type": "user/single_integer/1"
+ }
+ }
+ }
+ ]
+}
diff --git a/beat/backend/python/test/prefix/algorithms/autonomous/loop_user/1.py b/beat/backend/python/test/prefix/algorithms/autonomous/loop_user/1.py
new file mode 100644
index 0000000000000000000000000000000000000000..56f50e13ebac3c706e934dbab14537759b4ec5e3
--- /dev/null
+++ b/beat/backend/python/test/prefix/algorithms/autonomous/loop_user/1.py
@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+# vim: set fileencoding=utf-8 :
+
+###############################################################################
+# #
+# Copyright (c) 2018 Idiap Research Institute, http://www.idiap.ch/ #
+# Contact: beat.support@idiap.ch #
+# #
+# This file is part of the beat.backend.python module of the BEAT platform. #
+# #
+# Commercial License Usage #
+# Licensees holding valid commercial BEAT licenses may use this file in #
+# accordance with the terms contained in a written agreement between you #
+# and Idiap. For further information contact tto@idiap.ch #
+# #
+# Alternatively, this file may be used under the terms of the GNU Affero #
+# Public License version 3 as published by the Free Software and appearing #
+# in the file LICENSE.AGPL included in the packaging of this file. #
+# The BEAT platform is distributed in the hope that it will be useful, but #
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY #
+# or FITNESS FOR A PARTICULAR PURPOSE. #
+# #
+# You should have received a copy of the GNU Affero Public License along #
+# with the BEAT platform. If not, see http://www.gnu.org/licenses/. #
+# #
+###############################################################################
+
+class Algorithm:
+
+ def process(self, data_loaders, outputs, loop_channel):
+ cnt = 100
+ while not loop_channel.is_result_valid(cnt):
+ cnt = cnt - 1
+
+ data_loader = data_loaders.loaderOf('in')
+
+ for i in range(data_loader.count()):
+ (data, start, end) = data_loader[i]
+
+ outputs['out'].write({
+ 'value': data['in'].value,
+ },
+ end
+ )
+ return True