Added a test to trigger the bug reported in #485.

tests/CMakeLists.txt

@@ -46,7 +46,7 @@ set(PYTHON_TESTS ResetOutputFiles
                  TestFunctions
                  TestDistributor
                  TestMagnetometer
-                 )
+                 TestLinearActuator)
 
 foreach(test ${PYTHON_TESTS})
   add_test(NAME ${test}

tests/TestLinearActuator.py

@@ -0,0 +1,37 @@
+# TestDeadBand.py
+#
+# Test that the <linear_actuator> component is functional.
+#
+# Copyright (c) 2021 Bertrand Coconnier
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 3 of the License, or (at your option) any later
+# version.
+#
+# This program 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.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, see <http://www.gnu.org/licenses/>
+#
+
+from JSBSim_utils import JSBSimTestCase, RunTest, FlightModel
+
+
+class TestLinearActuator(JSBSimTestCase):
+    def test_bug_GH485(self):
+        """Regression test for issue GH#485"""
+        tripod = FlightModel(self, 'tripod')
+        tripod.include_system_test_file('linear_actuator.xml')
+        fdm = tripod.start()
+
+        for v0, v in zip((2, 1, 358, 359, 1, 2, 359), (2, 1, -2, -1, 1, 2, -1)):
+            fdm['test/input'] = v0
+            fdm.run()
+            self.assertAlmostEqual(fdm['test/output'], v)
+
+
+RunTest(TestLinearActuator)

tests/linear_actuator.xml

@@ -0,0 +1,10 @@
+<system>
+  <property>test/input</property>
+  <channel name="test">
+    <linear_actuator>
+      <input>test/input</input>
+      <module>360</module>
+      <output>test/output</output>
+    </linear_actuator>
+  </channel>
+</system>