def test_convert_columns_to_str(self):
# Test that all columns are string
mixed_raw = [{
'col1': 1,
'col2': 2,
'col3': 3
}, {
'col1': 'one',
'col2': 2,
'col3': [3, 'three', 3.0]
}, {
'col1': {
'one': 1,
"two": 2.0
},
'col2': None,
"col3": 'three'
}]
tbl = Table(mixed_raw)
tbl.convert_columns_to_str()
cols = tbl.get_columns_type_stats()
type_set = {i for x in cols for i in x['type']}
self.assertTrue('str' in type_set and len(type_set) == 1)
