def test_second_none_input(self, mock_stdout):
"""
Test if None input is correctly validated for second line
"""
result = main.check_overlapping([10, 5], None)
self.assertFalse(result)
self.assertEqual(mock_stdout.getvalue(), 'First and second line must not be None\n')
def test_not_overlap_negative(self):
"""
Test two lines that must not overlap
"""
result = main.check_overlapping([-1, -5], [-6, -8])
self.assertFalse(result)
def test_overlap_negative(self):
"""
Test two lines that must overlap
"""
result = main.check_overlapping([-5, -1], [-6, -2])
self.assertTrue(result)
def test_not_overlap(self):
"""
Test two lines that must not overlap
"""
result = main.check_overlapping([1, 5], [6, 8])
self.assertFalse(result)
def test_overlap(self):
"""
Test two lines that must overlap
"""
result = main.check_overlapping([1, 5], [2, 6])
self.assertTrue(result)