# file src/coverup/coverup.py:142-145
# lines [145]
# branches []

import pytest
from pathlib import Path
from unittest.mock import MagicMock

# Assuming the 'args' is part of a larger module or context, we'll need to mock it
# For the purpose of this example, let's assume 'args' is an attribute of a module named 'coverup'
# We will also assume that 'coverup.args' has 'tests_dir' and 'prefix' attributes

# Mocking the 'coverup' module
class MockArgs:
    def __init__(self, tests_dir, prefix):
        self.tests_dir = Path(tests_dir)
        self.prefix = prefix

@pytest.fixture
def mock_args(monkeypatch):
    # Setup the mock
    mock_args = MockArgs('/tmp', 'mock_prefix')
    monkeypatch.setattr('coverup.coverup.args', mock_args, raising=False)
    # Teardown code to clean up after the test
    yield
    # No teardown needed as monkeypatch will undo the patching after the test

def test_file_path_executes_line_145(mock_args):
    from coverup.coverup import test_file_path

    test_seq = 1
    expected_path = Path('/tmp') / f"test_mock_prefix_{test_seq}.py"
    actual_path = test_file_path(test_seq)
    
    assert actual_path == expected_path, "The test_file_path function did not return the expected file path"
