check for bad read_* and write_* methods

raise a ProgrammingError when a read_<param> or write_<param>
method is defined, but <param> is no parameter.

Change-Id: Iae4e617d078229182a90b202a6f81ebc49050118
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/27386
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

test/test_modules.py

@@ -458,3 +458,23 @@ def test_command_none():
 
     assert 'stop' in Mod('o', logger, {'description': ''}, srv).accessibles
     assert 'stop' not in Mod2('o', logger, {'description': ''}, srv).accessibles
+
+
+def test_bad_method():
+    class Mod0(Drivable):  # pylint: disable=unused-variable
+        def write_target(self, value):
+            pass
+
+    with pytest.raises(ProgrammingError):
+        class Mod1(Drivable):  # pylint: disable=unused-variable
+            def write_taget(self, value):
+                pass
+
+    class Mod2(Drivable):  # pylint: disable=unused-variable
+        def read_value(self, value):
+            pass
+
+    with pytest.raises(ProgrammingError):
+        class Mod3(Drivable):  # pylint: disable=unused-variable
+            def read_valu(self, value):
+                pass