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"""
Test functions in gn3.data_helpers
"""
from unittest import TestCase
import pytest
from gn3.data_helpers import partition_by, partition_all, parse_csv_line
class TestDataHelpers(TestCase):
"""
Test functions in gn3.data_helpers
"""
@pytest.mark.unit_test
def test_partition_all(self):
"""
Test that `gn3.data_helpers.partition_all` partitions sequences as expected.
Given:
- `num`: The number of items per partition
- `items`: A sequence of items
When:
- The arguments above are passed to the `gn3.data_helpers.partition_all`
Then:
- Return a new sequence with partitions, each of which has `num`
items in the same order as those in `items`, save for the last
partition which might have fewer items than `num`.
"""
for count, items, expected in (
(1, [0, 1, 2, 3], ((0,), (1,), (2,), (3,))),
(3, (0, 1, 2, 3, 4, 5, 6, 7, 8, 9),
((0, 1, 2), (3, 4, 5), (6, 7, 8), (9, ))),
(4, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
((0, 1, 2, 3), (4, 5, 6, 7), (8, 9))),
(13, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
((0, 1, 2, 3, 4, 5, 6, 7, 8, 9), ))):
with self.subTest(n=count, items=items):
self.assertEqual(tuple(partition_all(count, items)), expected)
@pytest.mark.unit_test
def test_parse_csv_line(self):
"""
Test parsing a single line from a CSV file
Given:
- `line`: a line read from a csv file
- `delimiter`: the expected delimiter in the csv file
- `quoting`: the quoting enclosing each column in the csv file
When:
- `line` is parsed with the `parse_csv_file` with the given
parameters
Then:
- return a tuple of the columns in the CSV file, without the
delimiter and quoting
"""
for line, delimiter, quoting, expected in (
('"this","is","a","test"', ",", '"', ("this", "is", "a", "test")),
('"this","is","a","test"', ",", None, ('"this"', '"is"', '"a"', '"test"'))):
with self.subTest(line=line, delimiter=delimiter, quoting=quoting):
self.assertEqual(
parse_csv_line(
line=line, delimiter=delimiter, quoting=quoting),
expected)
@pytest.mark.unit_test
def test_partition_by(self):
"""
Test that `partition_by` groups the data using the given predicate
Given:
- `part_fn`: a predicate funtion that return boolean True/False
- `items`: a sequence of items
When:
- the partitioning predicate function and the sequence of items are
passed to the `partition_by` function
Then:
- the result is a tuple, with sub-tuples containing the data in the
original sequence. Each sub-tuple is a partition, ending as soon as
the next value in the sequence, when passed to `part_fn`, returns
boolean `True`.
"""
for part_fn, items, expected in (
(lambda s: s.startswith("----"),
("------", "a", "b", "-----", "c", "----", "d", "e", "---",
"f"),
(("------", "a", "b"), ("-----", "c"),
("----", "d", "e", "---", "f"))),
(lambda x: (x % 2) == 0,
(0, 1, 3, 2, 4, 5, 7, 6, 9, 1),
((0, 1, 3), (2,), (4, 5, 7), (6, 9, 1))),):
with self.subTest(items=items):
self.assertEqual(partition_by(part_fn, items), expected)
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