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# -*- coding: utf-8 -*-
"""Tests for multigroupby."""
import unittest
from typing import Iterable
from multisplitby import multi_split_by
def _consume(iterable: Iterable):
def yield_all():
yield from iterable
return list(yield_all())
def predicate_1(x: int) -> bool:
"""Return true if the integer is 3."""
return x == 3
def predicate_2(x: int) -> bool:
"""Return true if the integer is 6."""
return x == 6
def predicate_3(x: int) -> bool:
"""Return true if the integer is 8."""
return x == 8
class TestIter(unittest.TestCase):
"""Test :mod:`multisplitby`."""
def test_split_by_iterable_is_empty(self):
"""Test when an empty iterable is given."""
integers = []
predicates = [predicate_1, predicate_2]
r = list(multi_split_by(integers, predicates))
self.assertEqual(1 + len(predicates), len(r))
a, b, c = r
self.assertIsNotNone(a)
self.assertIsNotNone(b)
self.assertIsNotNone(c)
a = _consume(a)
b = _consume(b)
c = _consume(c)
self.assertEqual([], a)
self.assertEqual([], b)
self.assertEqual([], c)
def test_split_by_predicates_is_empty(self):
"""Test when empty predicates are given."""
integers = [1, 2, 3, 4]
predicates = []
r = tuple(multi_split_by(integers, predicates))
self.assertEqual(1 + len(predicates), len(r))
a, = r
self.assertIsNotNone(a)
a = _consume(a)
self.assertEqual([1, 2, 3, 4], a)
def test_split_by_two(self):
"""Test the :func:`multisplitby.multi_split_by` function with two predicates."""
integers = [1, 2, 3, 4, 5, 6, 7]
predicates = [predicate_1, predicate_2]
# expected = [[1, 2], [3, 4, 5], [6, 7]]
r = tuple(multi_split_by(integers, predicates))
self.assertEqual(1 + len(predicates), len(r))
a, b, c = r
self.assertIsNotNone(a)
self.assertIsNotNone(b)
self.assertIsNotNone(c)
a = _consume(a)
b = _consume(b)
c = _consume(c)
self.assertEqual([1, 2], a)
self.assertEqual([3, 4, 5], b)
self.assertEqual([6, 7], c)
def test_split_by_three(self):
"""Test the :func:`multisplitby.multi_split_by` function with three predicates."""
integers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
predicates = [predicate_1, predicate_2, predicate_3]
# expected = [[1, 2], [3, 4, 5], [6, 7], [8, 9, 10]]
r = tuple(multi_split_by(integers, predicates))
self.assertEqual(1 + len(predicates), len(r))
a, b, c, d = r
self.assertIsNotNone(a)
self.assertIsNotNone(b)
self.assertIsNotNone(c)
self.assertIsNotNone(d)
a = _consume(a)
b = _consume(b)
c = _consume(c)
d = _consume(d)
self.assertEqual([1, 2], a)
self.assertEqual([3, 4, 5], b)
self.assertEqual([6, 7], c)
self.assertEqual([8, 9, 10], d)
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