Sure, here are some unit tests for the program:
```python
import os
import hashlib
import csv
import unittest

class TestDuplicateFileFinder(unittest.TestCase):

    def setUp(self):
        self.directory = os.path.join(os.getcwd(), "test_directory")
        self.create_test_files()
        
    def tearDown(self):
        self.remove_test_files()

    def create_test_files(self):
        if not os.path.exists(self.directory):
            os.mkdir(self.directory)
        file1 = os.path.join(self.directory, "file1.txt")
        with open(file1, "w") as f:
            f.write("Hello, world!")
        file2 = os.path.join(self.directory, "file2.txt")
        with open(file2, "w") as f:
            f.write("Hello, world!")
        file3 = os.path.join(self.directory, "file3.txt")
        with open(file3, "w") as f:
            f.write("Goodbye, world!")
        
    def remove_test_files(self):
        for root, dirs, files in os.walk(self.directory, topdown=False):
            for name in files:
                os.remove(os.path.join(root, name))
            for name in dirs:
                os.rmdir(os.path.join(root, name))
        os.rmdir(self.directory)

    def test_hash_file(self):
        file_path = os.path.join(self.directory, "file1.txt")
        expected_hash = hashlib.md5(b"Hello, world!").hexdigest()
        self.assertEqual(hash_file(file_path), expected_hash)

    def test_add_file_to_dict(self):
        file_id = "file1.txt_13_1613722016.3689346_1613722016.3689346"
        file_path = os.path.join(self.directory, "file1.txt")
        file_size = os.path.getsize(file_path)
        file_created = os.path.getctime(file_path)
        file_modified = os.path.getmtime(file_path)
        file_hash = hash_file(file_path)
        add_file_to_dict(file_id, file_path, file_size, file_created, file_modified, file_hash)
        expected_dict = {
            "file1.txt_13_1613722016.3689346_1613722016.3689346": {
                "path": file_path,
                "size": file_size,
                "created": file_created,
                "modified": file_modified,
                "hash": file_hash
            }
        }
        self.assertDictEqual(file_info, expected_dict)

    def test_scan_directory(self):
        scan_directory(self.directory)
        expected_file_info = {
            "file1.txt_13_1613722016.3689346_1613722016.3689346": {
                "path": os.path.join(self.directory, "file1.txt"),
                "size": 13,
                "created": 1613722016.3689346,
                "modified": 1613722016.3689346,
                "hash": hashlib.md5(b"Hello, world!").hexdigest()
            },
            "file2.txt_13_1613722016.3689346_1613722016.3689346": {
                "path": os.path.join(self.directory, "file2.txt"),
                "size": 13,
                "created": 1613722016.3689346,
                "modified": 1613722016.3689346,
                "hash": hashlib.md5(b"Hello, world!").hexdigest()
            },
            "file3.txt_14_1613722016.3689346_1613722016.3689346": {
                "path": os.path.join(self.directory, "file3.txt"),
                "size
```
물론, 다음은 프로그램에 대한 몇 가지 단위 테스트입니다:'''파이썬import osimport hashlibimport csvimport unittest클래스 TestDuplicateFileFinder(unittest.TestCase):    def setUp(self):        self.directory = os.path.join(os.getcwd(), "test_directory")        self.create_test_files()            def tearDown(self):        self.remove_test_files()    def create_test_files(self):        if not os.path.exists(self.directory):            os.mkdir(self.directory)        file1 = os.path.join(self.directory, "file1.txt")        with open(file1, "w") as f:            f.write("안녕하세요, 세상!")        file2 = os.path.join(self.directory, "file2.txt")        with open(file2, "w") as f:            f.write("안녕하세요, 세상!")        file3 = os.path.join(self.directory, "file3.txt")        with open(file3, "w") as f:            f.write("안녕, 세상!")            def remove_test_files(self):        for root, dirs, files in os.walk(self.directory, topdown=False):            파일의 이름에 대해                os.remove(os.path.join(root, name))            for name in dirs:                os.rmdir(os.path.join(root, name))        os.rmdir(self.directory)    def test_hash_file(self):        file_path = os.path.join(self.directory, "file1.txt")        expected_hash = hashlib.md5(b"Hello, world!").hexdigest()        self.assertEqual(hash_file(file_path), expected_hash)    def test_add_file_to_dict(self):        file_id = "file1.txt_13_1613722016.3689346_1613722016.3689346"        file_path = os.path.join(self.directory, "file1.txt")        file_size = os.path.getsize(file_path)        file_created = os.path.getctime(file_path)        file_modified = os.path.getmtime(file_path)        file_hash = 해시_파일(파일_경로)        add_file_to_dict(file_id, file_path, file_size, file_created, file_modified, file_hash)        expected_dict = {            "file1.txt_13_1613722016.3689346_1613722016.3689346": {                "경로": 파일_경로,                "size": file_size,                "created": file_created,                "수정됨": 파일_수정됨,                "해시": 파일_해시            }        }        self.assertDictEqual(file_info, expected_dict)    def test_scan_directory(self):        SCAN_DIR렉토리(self.디렉터리)        expected_file_info = {            "file1.txt_13_1613722016.3689346_1613722016.3689346": {                "경로": os.path.join(self.directory, "file1.txt"),                "size": 13,                "created": 1613722016.3689346,                "modified": 1613722016.3689346,                "해시": hashlib.md5(b"Hello, world!").hexdigest()            },            "file2.txt_13_1613722016.3689346_1613722016.3689346": {                "경로": os.path.join(self.directory, "file2.txt"),                "size": 13,                "created": 1613722016.3689346,                "modified": 1613722016.3689346,                "해시": hashlib.md5(b"Hello, world!").hexdigest()            },            "file3.txt_14_1613722016.3689346_1613722016.3689346": {                "경로": os.path.join(self.directory, "file3.txt"),                "size```