pyTest: launch testThreadEnv with an invert node

* The problems seems to appear with the blur node...
* Issue #512

Author: Clement Champetier

libraries/tuttle/pyTest/compute/testThreadEnv.py

@@ -1,16 +1,14 @@
 from pyTuttle import tuttle
-from nose.tools import nottest
 
 
 def setUp():
 	tuttle.core().preload(False)
 
 
-@nottest
 def testThreadEnv():
 	g = tuttle.Graph()
 	pngRead = g.createNode("tuttle.checkerboard", size=[50,50])
-	blur = g.createNode('tuttle.blur')
+	blur = g.createNode('tuttle.invert')
 	pngW = g.createNode('tuttle.pngwriter', ".tests/output-###.png")
 	g.connect( [pngRead, blur, pngW] )