test dataframe dir

Author: badiku

streamz/dataframe/tests/test_dataframes.py

@@ -1007,3 +1007,10 @@ def test_windowed_groupby_aggs_with_start_state(stream):
     stream.emit(df)
     out_df1 = pd.DataFrame({'name':['Alice', 'Bob', 'Linda', 'Tom'], 'amount':[50.0, 550.0, 100.0, 150.0]})
     assert_eq(output1[-1][1].reset_index(), out_df1)
+
+    
+def test_dir(stream):
+    example = pd.DataFrame({'name': [], 'amount': []})
+    sdf = DataFrame(stream, example=example)
+    assert 'name' in dir(sdf)
+    assert 'amount' in dir(sdf)