from merge_intervals import merge_intervals

def test_empty():
    assert merge_intervals([]) == []

def test_single():
    assert merge_intervals([(1,3)]) == [[1,3]]

def test_overlap():
    assert merge_intervals([(1,3),(2,4)]) == [[1,4]]

def test_disjoint():
    assert merge_intervals([(1,2),(4,5)]) == [[1,2],[4,5]]

def test_nested():
    assert merge_intervals([(1,10),(2,3),(4,5)]) == [[1,10]]

def test_touching_default_not_merged():
    assert merge_intervals([(1,2),(3,4)]) == [[1,2],[3,4]]

def test_touching_merged():
    assert merge_intervals([(1,2),(3,4)], merge_touching=True) == [[1,4]]

def test_unsorted():
    assert merge_intervals([(5,6),(1,2),(2,3)]) == [[1,3],[5,6]]

def test_dup():
    assert merge_intervals([(1,2),(1,2)]) == [[1,2]]

if __name__=="__main__":
    for n in [x for x in globals() if x.startswith("test_")]:
        globals()[n]()
    print("ALL TESTS PASSED")

# Run at import time so unittest discover exercises these cases.
for n in [x for x in globals() if x.startswith("test_")]:
    globals()[n]()