tests: first attempt to add tests for wago controller

tests/test_configuration/wago.yml

+plugin: bliss
+class: wago
+name: wcid00
+controller_ip: localhost
+mapping:
+    -
+        type: 750-530
+        logical_names: attctrl,_,attctrl,_,attctrl,_,attctrl,_
+    -
+        type: 750-530
+        logical_names: attctrl,detcover_ctrl,attctrl,_,attctrl, _,attctrl,_
+    -
+        type: 750-436
+        logical_names: attstatus,attstatus,attstatus,attstatus,attstatus,attstatus,attstatus,attstatus
+

tests/wago/test_wago.py

+# -*- coding: utf-8 -*-
+#
+# This file is part of the bliss project
+#
+# Copyright (c) 2016 Beamline Control Unit, ESRF
+# Distributed under the GNU LGPLv3. See LICENSE for more info.
+
+import pytest
+import time
+import mock
+import inspect
+
+def read_coils(what, size):
+    print "read coils", what, size
+    cc = inspect.currentframe().f_back
+    print "modules to read", cc.f_locals["modules_to_read"]
+    print "mapping", cc.f_locals["self"].mapping 
+    if what == 512:
+      # IN
+      return [0]*size
+    else:
+      # OUT
+      return [1]*size
+ 
+def write_coil(*args, **kwargs):
+    print "write coil", args, kwargs
+    
+def read_input_registers(*args, **kwargs):
+    print "read input registers", args, kwargs
+    
+def write_register(*args, **kwargs):
+    print "write register", args, kwargs
+    
+def test_wago(beacon):
+    w = beacon.get("wcid00")
+    w.connect()
+    
+    with mock.patch.object(w.controller.client, "read_coils", read_coils):
+      with mock.patch.object(w.controller.client, "read_input_registers", read_input_registers):
+        with mock.patch.object(w.controller.client, "write_coil", write_coil):
+          with mock.patch.object(w.controller.client, "write_register", write_register):
+            print w.get("attctrl", "attstatus")
+            #w.set("attctrl", *[1]*8)
+