Fix issues in setup file

setup.py

@@ -23,7 +23,7 @@
 
 from distutils.command.build import build as dftbuild
 from distutils.unixccompiler import UnixCCompiler
-from distutils.version import StrictVersion as V
+from distutils.version import LooseVersion as V
 
 # Sphinx imports
 try:
@@ -422,17 +422,20 @@ def setup_args():
         'six',
     ]
 
-    setup_requires = [
-        'pytest-runner' if TESTING else '',
-    ]
+    setup_requires = []
+
+    if TESTING:
+        setup_requires += ['pytest-runner']
 
     tests_require = [
         'pytest-xdist',
         'gevent',
         'psutil',
-        'trollius' if PYTHON2 else '',
     ]
 
+    if PYTHON2:
+        tests_require += ['trollius']
+
     package_data = {
         'PyTango': [],
     }

tests/test_client.py

@@ -204,7 +204,7 @@ def test_read_attribute(tango_test, readable_attribute):
     # This is a hack:
     # Without this sleep, the following error is very likely to be raised:
     # -> MARSHAL CORBA system exception: MARSHAL_PassEndOfMessage
-    if readable_attribute == "string_image_ro":
+    if readable_attribute in ["string_image_ro", "string_spectrum_ro"]:
         sleep(0.05)
     tango_test.read_attribute(readable_attribute, wait=True)
 

tests/test_event.py

@@ -77,8 +77,10 @@ def callback(evt):
         "attr", EventType.CHANGE_EVENT, callback, wait=True)
     event_device.command_inout("send_event", wait=True)
     # Wait for tango event
-    event_device.read_attribute("state", wait=True)
-    event_device.read_attribute("state", wait=True)
-    event_device.read_attribute("state", wait=True)
+    retries = 10
+    for _ in range(retries):
+        event_device.read_attribute("state", wait=True)
+        if len(results) > 1:
+            break
     # Test the event values
     assert results == [0., 1.]