Тестирование unittest

import click
@click.command()
@click.option('--name', prompt='Word or string')
@click.option('--filename', default='file.txt', prompt='file name')
@click.option('--param', default=1, prompt="Use 1 for save line and 2 for word, default: ")
def find(name, filename, param):
    """Simple program that find  word or string at text file and put it in new"""
    try:
        with open(filename) as f, open('result.txt', 'w') as f2:
            count = 0
            for line in f:
                if name in line:
                    if param == 1:
                        f2.write(line + '\n')
                    elif param == 2:
                        f2.write(name + '\n')
                    count += 1
            print("Find: {} sample".format(count))
            return count
    except FileNotFoundError:
        print('WARNING! ' + 'File: ' + filename + ' not found')
 
 
if __name__ == '__main__':
    find()

import unittest
import sfind
 
class SfindTest(unittest.TestCase):
    def test_sfind(self):
        self.assertEqual(sfind.find(), 4)
 
 
if __name__ == '__main__' :
    unittest.main()

python -m unittest test_sfind.SfindTest

click.exceptions.UsageError: Got unexpected extra argument (test_sfind.py)