L2SS-705: Add test for read_attribute

tangostationcontrol/tangostationcontrol/test/devices/test_lofar_device.py

+# -*- coding: utf-8 -*-
+#
+# This file is part of the LOFAR 2.0 Station Software
+#
+#
+#
+# Distributed under the terms of the APACHE license.
+# See LICENSE.txt for more info.
+
+from tango.test_context import DeviceTestContext
+from tango.server import attribute
+
+from tangostationcontrol.devices import lofar_device
+
+import mock
+
+from tangostationcontrol.test import base
+
+class TestLofarDevice(base.TestCase):
+    def setUp(self):
+        super(TestLofarDevice, self).setUp()
+
+        # Patch DeviceProxy to allow making the proxies during initialisation
+        # that we otherwise avoid using
+        for device in [lofar_device]:
+            proxy_patcher = mock.patch.object(
+                device, 'DeviceProxy')
+            proxy_patcher.start()
+            self.addCleanup(proxy_patcher.stop)
+    
+    def test_read_attribute(self):
+        """ Test whether read_attribute really returns the attribute. """
+
+        class MyLofarDevice(lofar_device.lofar_device):
+            @attribute(dtype=float)
+            def A(self):
+               return 42.0
+
+            @attribute(dtype=float)
+            def read_attribute_A(self):
+                return self.read_attribute("A")
+
+            @attribute(dtype=(float,), max_dim_x=2)
+            def B_array(self):
+               return [42.0, 43.0]
+
+            @attribute(dtype=(float,), max_dim_x=2)
+            def read_attribute_B_array(self):
+                return self.read_attribute("B_array")
+
+        with DeviceTestContext(MyLofarDevice, process=True, timeout=10) as proxy:
+            proxy.initialise()
+            self.assertEqual(42.0, proxy.read_attribute_A)
+            self.assertListEqual([42.0, 43.0], proxy.read_attribute_B_array.tolist())