# file src/coverup/segment.py:60-64
# lines [61, 62, 64]
# branches ['61->62', '61->64']

import pytest
from coverup.segment import CodeSegment
from unittest.mock import patch

# Assuming that the CodeSegment class has a constructor that requires several arguments
# and that the lines_branches_do function is defined elsewhere in the module.

# Test to cover lines 61-62
def test_lines_branches_missing_do_not_executed():
    segment = CodeSegment(
        filename='',
        name='',
        begin=0,
        end=0,
        lines_of_interest=set(),
        missing_lines=set(),
        executed_lines=set(),
        missing_branches=set(),
        context=None
    )
    assert segment.lines_branches_missing_do() == 'it does'

# Test to cover lines 64
def test_lines_branches_missing_do_executed():
    segment = CodeSegment(
        filename='',
        name='',
        begin=0,
        end=0,
        lines_of_interest=set(),
        missing_lines=set([4, 5]),
        executed_lines=set([1, 2, 3]),
        missing_branches=set([(6, True), (7, False)]),
        context=None
    )

    # Mocking the lines_branches_do function to avoid dependency on its implementation
    def mock_lines_branches_do(missing_lines, executed_lines, missing_branches):
        return "mocked result"

    with patch('coverup.segment.lines_branches_do', side_effect=mock_lines_branches_do):
        result = segment.lines_branches_missing_do()
        assert result == "mocked result"
