import git_time_tracker


def test_year_ranges_1():
    assert git_time_tracker.fmt_year_ranges([1, 2, 3]) == '1-3'


def test_year_ranges_2():
    assert git_time_tracker.fmt_year_ranges([1, 3]) == '1,3'


def test_year_ranges_3():
    assert git_time_tracker.fmt_year_ranges([1, 2, 4]) == '1-2,4'


def test_year_ranges_4():
    assert git_time_tracker.fmt_year_ranges([1, 2, 4, 5]) == '1-2,4-5'