diff --git a/beat/core/test/prefix/algorithms/schema/invalid_loop_output/1.json b/beat/core/test/prefix/algorithms/schema/invalid_loop_output/1.json
new file mode 100644
index 0000000000000000000000000000000000000000..97e8978fbe06dab70bdd328a25c728741ea0cce1
--- /dev/null
+++ b/beat/core/test/prefix/algorithms/schema/invalid_loop_output/1.json
@@ -0,0 +1,29 @@
+{
+ "schema_version": 3,
+ "language": "python",
+ "api_version": 2,
+ "type": "loop",
+ "splittable": false,
+ "groups": [
+ {
+ "inputs": {
+ "in": {
+ "type": "user/single_integer/1"
+ }
+ },
+ "outputs": {
+ "out": {
+ "type": "user/single_integer/1"
+ }
+ },
+ "loop": {
+ "request": {
+ "type": "user/single_integer/1"
+ },
+ "answer": {
+ "type": "user/single_integer/1"
+ }
+ }
+ }
+ ]
+}
diff --git a/beat/core/test/prefix/algorithms/schema/invalid_loop_output/1.py b/beat/core/test/prefix/algorithms/schema/invalid_loop_output/1.py
new file mode 100644
index 0000000000000000000000000000000000000000..157d8ffd163fee0033b59c8a023119e46ef76e63
--- /dev/null
+++ b/beat/core/test/prefix/algorithms/schema/invalid_loop_output/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 = result.value
+
+ return value < 6
diff --git a/beat/core/test/prefix/algorithms/schema/invalid_loop_type/1.json b/beat/core/test/prefix/algorithms/schema/invalid_loop_type/1.json
new file mode 100644
index 0000000000000000000000000000000000000000..1448ea9147604b8f8be5fb4e4495fe8cebd29e15
--- /dev/null
+++ b/beat/core/test/prefix/algorithms/schema/invalid_loop_type/1.json
@@ -0,0 +1,23 @@
+{
+ "schema_version": 3,
+ "language": "python",
+ "api_version": 2,
+ "type": "autonomous",
+ "groups": [
+ {
+ "inputs": {
+ "in": {
+ "type": "user/single_integer/1"
+ }
+ },
+ "loop": {
+ "request": {
+ "type": "user/single_integer/1"
+ },
+ "answer": {
+ "type": "user/single_integer/1"
+ }
+ }
+ }
+ ]
+}
diff --git a/beat/core/test/prefix/algorithms/schema/invalid_loop_type/1.py b/beat/core/test/prefix/algorithms/schema/invalid_loop_type/1.py
new file mode 100644
index 0000000000000000000000000000000000000000..157d8ffd163fee0033b59c8a023119e46ef76e63
--- /dev/null
+++ b/beat/core/test/prefix/algorithms/schema/invalid_loop_type/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 = result.value
+
+ return value < 6
diff --git a/beat/core/test/prefix/algorithms/schema/invalid_loop_user_type/1.json b/beat/core/test/prefix/algorithms/schema/invalid_loop_user_type/1.json
new file mode 100644
index 0000000000000000000000000000000000000000..399012b7fca61bca0261c7285d457f780ea203d0
--- /dev/null
+++ b/beat/core/test/prefix/algorithms/schema/invalid_loop_user_type/1.json
@@ -0,0 +1,28 @@
+{
+ "schema_version": 3,
+ "language": "python",
+ "api_version": 2,
+ "type": "autonomous",
+ "groups": [
+ {
+ "inputs": {
+ "in": {
+ "type": "user/single_integer/1"
+ }
+ },
+ "outputs": {
+ "out": {
+ "type": "user/single_integer/1"
+ }
+ },
+ "loop": {
+ "request": {
+ "type": "user/single_integer/1"
+ },
+ "answer": {
+ "type": "user/single_integer/1"
+ }
+ }
+ }
+ ]
+}
diff --git a/beat/core/test/prefix/algorithms/schema/invalid_loop_user_type/1.py b/beat/core/test/prefix/algorithms/schema/invalid_loop_user_type/1.py
new file mode 100644
index 0000000000000000000000000000000000000000..157d8ffd163fee0033b59c8a023119e46ef76e63
--- /dev/null
+++ b/beat/core/test/prefix/algorithms/schema/invalid_loop_user_type/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 = result.value
+
+ return value < 6
diff --git a/beat/core/test/test_algorithm_loading.py b/beat/core/test/test_algorithm_loading.py
index 9310cf8a07c480f2803487f44ede0e34ea01a29f..47ac6644ef7879567ca6c368678754589eca0e03 100644
--- a/beat/core/test/test_algorithm_loading.py
+++ b/beat/core/test/test_algorithm_loading.py
@@ -88,6 +88,18 @@ def test_v3():
algorithm = Algorithm(prefix, 'autonomous/loop_user/1')
assert algorithm.valid, '\n * %s' % '\n * '.join(algorithm.errors)
+
+def test_invalid_v3():
+ algorithm = Algorithm(prefix, 'schema/invalid_loop_output/1')
+ assert not algorithm.valid
+
+ algorithm = Algorithm(prefix, 'schema/invalid_loop_type/1')
+ assert not algorithm.valid
+
+ algorithm = Algorithm(prefix, 'schema/invalid_loop_user_type/1')
+ assert not algorithm.valid
+
+
#----------------------------------------------------------