test added to verify output assignment on category attribute, IBMStre…

…ams#2414

test/python/topology/test2_spl_category.py

@@ -0,0 +1,37 @@
+# Licensed Materials - Property of IBM
+# Copyright IBM Corp. 2016
+import unittest
+import sys
+import itertools
+import threading
+
+from streamsx.topology.topology import *
+from streamsx.topology.tester import Tester
+from streamsx.topology import schema
+import streamsx.topology.context
+from streamsx.topology.context import ConfigParams
+import streamsx.spl.op as op
+
+
+class TestSPLCategory(unittest.TestCase):
+    """ Test invocations of SPL operators from Python topology.
+    """
+    _multiprocess_can_split_ = True
+
+    def setUp(self):
+        Tester.setup_standalone(self)
+
+    def test_attribute_category(self):
+        topo = Topology()
+        b = op.Source(topo, "spl.utility::Beacon",
+            'tuple<uint64 seq, rstring category>',
+            params = {'iterations':2})
+        b.seq = b.output('IterationCount()')
+        b.category = b.output('"category"') # b.category causes TypeError: Object of type 'Expression' is not JSON serializable
+        s = b.stream
+
+        tester = Tester(topo)
+        tester.tuple_count(s, 2)
+        tester.test(self.test_ctxtype, self.test_config)
+
+