support/testing: add minimalmodbus runtime test

Signed-off-by: Marcus Hoffmann <bubu@bubu1.eu>
[yann.morin.1998@free.fr: add the comment to explain failure is success]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/testing/tests/package/sample_python_minimalmodbus.py

@@ -0,0 +1,11 @@
+import minimalmodbus
+from serial.serialutil import SerialException
+
+# We can't test proper behaviour in emulation, because there is
+# actually no emulated modbus hardware, so we rely on the module
+# to fail in an expected way to consider it is working correctly.
+# Failure (of the script) is success (of the test)!
+try:
+    instrument = minimalmodbus.Instrument('/dev/ttyUSB99', 1)
+except SerialException:
+    pass

support/testing/tests/package/test_python_minimalmodbus.py

@@ -0,0 +1,11 @@
+from tests.package.test_python import TestPythonPackageBase
+
+
+class TestPythonPy3Minimalmodbus(TestPythonPackageBase):
+    __test__ = True
+    config = TestPythonPackageBase.config + \
+        """
+        BR2_PACKAGE_PYTHON3=y
+        BR2_PACKAGE_PYTHON_MINIMALMODBUS=y
+        """
+    sample_scripts = ["tests/package/sample_python_minimalmodbus.py"]