def test_persist_rdd(self):
# Arrange
rdd = self.context.spark.sparkContext.parallelize([Row(column1='aa')])
cardo_dataframe = CardoDataFrame(rdd, '')
# Act
cardo_dataframe.persist()
# Assert
self.assertTrue(rdd.is_cached)
def test_persist_df(self):
# Arrange
df = self.context.spark.createDataFrame([['a']], 'column1: string')
cardo_dataframe = CardoDataFrame(df, '')
# Act
cardo_dataframe.persist()
# Assert
self.assertTrue(df.is_cached)
