cudf tests for rolling aggregations

Author: chinmaychandak

streamz/dataframe/tests/dask-worker-space/global.lock

@@ -1,9 +1,9 @@
 """
-Tests for cudf DataFrame
-All these tests are taken from test_dataframes module in the same folder.
-Some of these tests pass with cudf as they are, and others are marked xfail
-where a pandas like method is not implemented yet in cudf.
-But these tests should pass as cudf implement more pandas like methods.
+Tests for cudf DataFrames: 
+All tests have been cloned from the test_dataframes module in the same folder.
+Some of these tests pass with cudf, and others are marked with xfail
+where a pandas-like method is not yet implemented in cudf.
+But these tests should pass as and when cudf rolls out more pandas-like methods.
 """
 from __future__ import division, print_function
 

streamz/dataframe/tests/dask-worker-space/purge.lock

@@ -69,8 +69,8 @@ def test_attributes():
     df = pd.DataFrame({'x': [1, 2, 3], 'y': [4, 5, 6]})
     sdf = DataFrame(example=df)
 
-    assert 'x' in dir(sdf)
-    assert 'z' not in dir(sdf)
+    assert getattr(sdf,'x',-1) != -1
+    assert getattr(sdf,'z',-1) == -1
 
     sdf.x
     with pytest.raises(AttributeError):