diff --git a/tests/test_df_cols.py b/tests/test_df_cols.py
index 9a7566648..4ef204eb1 100644
--- a/tests/test_df_cols.py
+++ b/tests/test_df_cols.py
@@ -453,11 +453,7 @@ def test_cols_append_number():
 		actual_df = source_df.cols.append('new col',1)
 		expected_df = op.create.df([('names', StringType(), True),('height(ft)', ShortType(), True),('function', StringType(), True),('rank', ByteType(), True),('age', IntegerType(), True),('weight(t)', FloatType(), True),('japanese name', ArrayType(StringType(),True), True),('last position seen', StringType(), True),('date arrival', StringType(), True),('last date seen', StringType(), True),('attributes', ArrayType(FloatType(),True), True),('DateType', DateType(), True),('Tiemstamp', TimestampType(), True),('Cybertronian', BooleanType(), True),('function(binary)', BinaryType(), True),('NullType', NullType(), True),('new col', IntegerType(), False)], [("Optim'us", 28, 'Leader', 10, 5000000, 4.300000190734863, ['Inochi', 'Convoy'], '19.442735,-99.201111', '1980/04/10', '2016/09/10', [8.53439998626709, 4300.0], datetime.date(2016, 9, 10), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'Leader'), None, 1), ('bumbl#ebéé  ', 17, 'Espionage', 7, 5000000, 2.0, ['Bumble', 'Goldback'], '10.642707,-71.612534', '1980/04/10', '2015/08/10', [5.334000110626221, 2000.0], datetime.date(2015, 8, 10), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'Espionage'), None, 1), ('ironhide&', 26, 'Security', 7, 5000000, 4.0, ['Roadbuster'], '37.789563,-122.400356', '1980/04/10', '2014/07/10', [7.924799919128418, 4000.0], datetime.date(2014, 6, 24), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'Security'), None, 1), ('Jazz', 13, 'First Lieutenant', 8, 5000000, 1.7999999523162842, ['Meister'], '33.670666,-117.841553', '1980/04/10', '2013/06/10', [3.962399959564209, 1800.0], datetime.date(2013, 6, 24), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'First Lieutenant'), None, 1), ('Megatron', None, 'None', 10, 5000000, 5.699999809265137, ['Megatron'], None, '1980/04/10', '2012/05/10', [None, 5700.0], datetime.date(2012, 5, 10), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'None'), None, 1), ('Metroplex_)^$', 300, 'Battle Station', 8, 5000000, None, ['Metroflex'], None, '1980/04/10', '2011/04/10', [91.44000244140625, None], datetime.date(2011, 4, 10), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'Battle Station'), None, 1)])
 		assert (expected_df.collect() == actual_df.collect())
-	@staticmethod
-	def test_cols_append_advance():
-		actual_df = source_df.cols.append([('new_col_4', 'test'),('new_col_5', Column<b'(rank * 2)'>),('new_col_6', [1, 2, 3])])
-		expected_df = op.create.df([('names', StringType(), True),('height(ft)', ShortType(), True),('function', StringType(), True),('rank', ByteType(), True),('age', IntegerType(), True),('weight(t)', FloatType(), True),('japanese name', ArrayType(StringType(),True), True),('last position seen', StringType(), True),('date arrival', StringType(), True),('last date seen', StringType(), True),('attributes', ArrayType(FloatType(),True), True),('DateType', DateType(), True),('Tiemstamp', TimestampType(), True),('Cybertronian', BooleanType(), True),('function(binary)', BinaryType(), True),('NullType', NullType(), True),('new_col_4', StringType(), False),('new_col_5', IntegerType(), True),('new_col_6', ArrayType(IntegerType(),False), False)], [("Optim'us", 28, 'Leader', 10, 5000000, 4.300000190734863, ['Inochi', 'Convoy'], '19.442735,-99.201111', '1980/04/10', '2016/09/10', [8.53439998626709, 4300.0], datetime.date(2016, 9, 10), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'Leader'), None, 'test', 20, [1, 2, 3]), ('bumbl#ebéé  ', 17, 'Espionage', 7, 5000000, 2.0, ['Bumble', 'Goldback'], '10.642707,-71.612534', '1980/04/10', '2015/08/10', [5.334000110626221, 2000.0], datetime.date(2015, 8, 10), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'Espionage'), None, 'test', 14, [1, 2, 3]), ('ironhide&', 26, 'Security', 7, 5000000, 4.0, ['Roadbuster'], '37.789563,-122.400356', '1980/04/10', '2014/07/10', [7.924799919128418, 4000.0], datetime.date(2014, 6, 24), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'Security'), None, 'test', 14, [1, 2, 3]), ('Jazz', 13, 'First Lieutenant', 8, 5000000, 1.7999999523162842, ['Meister'], '33.670666,-117.841553', '1980/04/10', '2013/06/10', [3.962399959564209, 1800.0], datetime.date(2013, 6, 24), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'First Lieutenant'), None, 'test', 16, [1, 2, 3]), ('Megatron', None, 'None', 10, 5000000, 5.699999809265137, ['Megatron'], None, '1980/04/10', '2012/05/10', [None, 5700.0], datetime.date(2012, 5, 10), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'None'), None, 'test', 20, [1, 2, 3]), ('Metroplex_)^$', 300, 'Battle Station', 8, 5000000, None, ['Metroflex'], None, '1980/04/10', '2011/04/10', [91.44000244140625, None], datetime.date(2011, 4, 10), datetime.datetime(2014, 6, 24, 0, 0), True, bytearray(b'Battle Station'), None, 'test', 16, [1, 2, 3])])
-		assert (expected_df.collect() == actual_df.collect())
+
 	@staticmethod
 	def test_cols_rename():
 		actual_df = source_df.cols.rename('rank','rank(old)')