"""find_max 单元测试"""

import pytest

from src.algorithms.find_max import find_max


class TestFindMax:
    def test_normal_list(self):
        assert find_max([3, 1, 4, 1, 5, 9, 2, 6]) == 9

    def test_empty_list(self):
        assert find_max([]) is None

    def test_single_element(self):
        assert find_max([42]) == 42

    def test_negative_numbers(self):
        assert find_max([-5, -1, -10, -3]) == -1

    def test_floats(self):
        assert find_max([1.5, 2.7, 0.3, 3.14]) == 3.14

    def test_mixed_int_float(self):
        assert find_max([1, 2.5, 3, 0.1]) == 3

    def test_duplicate_max(self):
        assert find_max([7, 7, 7]) == 7