deferred context test

contrib/Python/cntk/tests/context_test.py

@@ -6,7 +6,9 @@
 
 import numpy as np
 from ..context import *
-
+from ..ops.cntk2 import Input
+from ..sgd import *
+from ..reader import *
 
 def test_parse_shapes_1():
     output = '''\
@@ -107,3 +109,25 @@ Final Results: Minibatch[1-1]: eval_node = 2.77790430 * 500; crit_node = 0.44370
     assert result['eval_node'] == 2.77790430
     assert result['crit_node'] == 0.44370050
     assert len(result) == 3
+    
+def test_export_deferred_context():
+    X = Input(2)    
+    reader = CNTKTextFormatReader("Data.txt")
+    my_sgd = SGDParams()
+
+    with DeferredExecutionContext() as ctx:
+        input_map=reader.map(X, alias='I', dim=2)
+        ctx.train(
+            root_nodes=[X], 
+            training_params=my_sgd,
+            input_map=input_map)
+
+        ctx.test(
+                root_nodes=[X], 
+                input_map=input_map)    
+
+        ctx.write(input_map=input_map)    
+        ctx.eval(X, input_map)  
+        with open(ctx.export("name")) as config_file:
+            assert config_file.readlines()[-1] == "command=Train:Test:Write:Eval"
+