def test_mergesort_basic(self):
"""Test basic sorting."""
unsorted_list = [5, 3, 7, 8, 9, 3]
sorted_list = mergesort(unsorted_list)
assert sorted_list == sorted(unsorted_list)
def test_mergesort_with_duplicates(self):
"""Test sorting a list with duplicates."""
unsorted_list = [1, 1, 1, 1]
sorted_list = mergesort(unsorted_list)
assert sorted_list == sorted(unsorted_list)
def test_mergesort_with_empty_list(self):
"""Test sorting a empty list."""
unsorted_list = []
sorted_list = mergesort(unsorted_list)
assert sorted_list == sorted(unsorted_list)
def test_mergesort_trivial(self):
"""Test sorting when it's only one item."""
unsorted_list = [1]
sorted_list = mergesort(unsorted_list)
assert sorted_list == sorted(unsorted_list)
