diff --git a/.gitignore b/.gitignore
index c3e7dce..c736e36 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,4 +10,28 @@
 .vscode
 
 # 运行缓存
-__pycache__
\ No newline at end of file
+__pycache__
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+coverage.xml
+.tox/
+
+# Claude Code settings
+.claude/
+
+# Build artifacts
+dist/
+build/
+*.egg-info/
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# OS files
+.DS_Store
+Thumbs.db
\ No newline at end of file
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..33ceef1
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,525 @@
+# This file is automatically @generated by Poetry 2.1.4 and should not be changed by hand.
+
+[[package]]
+name = "certifi"
+version = "2022.12.7"
+description = "Python package for providing Mozilla's CA Bundle."
+optional = false
+python-versions = ">=3.6"
+groups = ["main"]
+files = [
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+]
+
+[[package]]
+name = "charset-normalizer"
+version = "3.0.1"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
+optional = false
+python-versions = "*"
+groups = ["main"]
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+    {file = "urllib3-1.26.14-py2.py3-none-any.whl", hash = "sha256:75edcdc2f7d85b137124a6c3c9fc3933cdeaa12ecb9a6a959f22797a0feca7e1"},
+    {file = "urllib3-1.26.14.tar.gz", hash = "sha256:076907bf8fd355cde77728471316625a4d2f7e713c125f51953bb5b3eecf4f72"},
+]
+
+[package.extras]
+brotli = ["brotli (>=1.0.9) ; (os_name != \"nt\" or python_version >= \"3\") and platform_python_implementation == \"CPython\"", "brotlicffi (>=0.8.0) ; (os_name != \"nt\" or python_version >= \"3\") and platform_python_implementation != \"CPython\"", "brotlipy (>=0.6.0) ; os_name == \"nt\" and python_version < \"3\""]
+secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "ipaddress ; python_version == \"2.7\"", "pyOpenSSL (>=0.14)", "urllib3-secure-extra"]
+socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
+
+[metadata]
+lock-version = "2.1"
+python-versions = "^3.8"
+content-hash = "67b8565587c36e888d3cc7e326168d978dcb68cd6631f9a624497eafd44c289d"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..d571205
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,83 @@
+[tool.poetry]
+name = "video-converter"
+version = "0.1.0"
+description = "A Python video converter with audio processing capabilities"
+authors = ["Your Name <your.email@example.com>"]
+readme = "README.md"
+packages = [{include = "video_converter"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+certifi = "2022.12.7"
+charset-normalizer = "3.0.1"
+colorama = "0.4.6"
+colorlog = "6.7.0"
+idna = "3.4"
+numpy = "1.24.2"
+pydub = "0.25.1"
+requests = "2.28.2"
+SpeechRecognition = "3.9.0"
+urllib3 = "1.26.14"
+
+[tool.poetry.group.test.dependencies]
+pytest = "^7.4.0"
+pytest-cov = "^4.1.0"
+pytest-mock = "^3.11.1"
+
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = [
+    "--strict-markers",
+    "--strict-config",
+    "--verbose",
+    "--cov=video_converter",
+    "--cov-report=html:htmlcov",
+    "--cov-report=xml:coverage.xml",
+    "--cov-report=term-missing",
+    "--cov-fail-under=80"
+]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests", 
+    "slow: Slow tests"
+]
+
+[tool.coverage.run]
+source = ["video_converter"]
+branch = true
+omit = [
+    "*/tests/*",
+    "*/test_*",
+    "*/__pycache__/*",
+    "*/venv/*",
+    "*/virtualenv/*",
+    "*/.pytest_cache/*"
+]
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "def __repr__",
+    "if self.debug:",
+    "if settings.DEBUG",
+    "raise AssertionError",
+    "raise NotImplementedError",
+    "if 0:",
+    "if __name__ == .__main__.:",
+    "class .*\\bProtocol\\):",
+    "@(abc\\.)?abstractmethod"
+]
+ignore_errors = true
+precision = 2
+show_missing = true
+
+[tool.coverage.html]
+directory = "htmlcov"
\ No newline at end of file
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..bd7f089
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,85 @@
+import pytest
+import tempfile
+import shutil
+from pathlib import Path
+from unittest.mock import Mock, MagicMock
+
+
+@pytest.fixture
+def temp_dir():
+    """Create a temporary directory for test files."""
+    temp_path = Path(tempfile.mkdtemp())
+    yield temp_path
+    shutil.rmtree(temp_path)
+
+
+@pytest.fixture
+def sample_audio_file(temp_dir):
+    """Create a mock audio file for testing."""
+    audio_file = temp_dir / "sample.wav"
+    audio_file.touch()
+    return audio_file
+
+
+@pytest.fixture
+def sample_video_file(temp_dir):
+    """Create a mock video file for testing."""
+    video_file = temp_dir / "sample.mp4"
+    video_file.touch()
+    return video_file
+
+
+@pytest.fixture
+def mock_logger():
+    """Mock logger for testing logging functionality."""
+    return Mock()
+
+
+@pytest.fixture
+def mock_config():
+    """Mock configuration for testing."""
+    return {
+        'output_dir': '/tmp/output',
+        'log_level': 'INFO',
+        'supported_formats': ['.wav', '.mp3', '.m4a', '.mp4']
+    }
+
+
+@pytest.fixture
+def mock_pydub_audio():
+    """Mock pydub AudioSegment for testing."""
+    mock_audio = MagicMock()
+    mock_audio.duration_seconds = 10.0
+    mock_audio.frame_rate = 44100
+    mock_audio.channels = 2
+    return mock_audio
+
+
+@pytest.fixture
+def mock_speech_recognition():
+    """Mock speech recognition for testing."""
+    mock_recognizer = MagicMock()
+    mock_recognizer.recognize_google.return_value = "test transcription"
+    return mock_recognizer
+
+
+@pytest.fixture
+def sample_file_paths(temp_dir):
+    """Create sample file paths for testing."""
+    files = {
+        'audio': temp_dir / "audio.wav",
+        'video': temp_dir / "video.mp4", 
+        'text': temp_dir / "text.txt",
+        'log': temp_dir / "test.log"
+    }
+    
+    for file_path in files.values():
+        file_path.touch()
+    
+    return files
+
+
+@pytest.fixture(autouse=True)
+def reset_mocks():
+    """Reset all mocks before each test."""
+    yield
\ No newline at end of file
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_setup_validation.py b/tests/test_setup_validation.py
new file mode 100644
index 0000000..39df8e3
--- /dev/null
+++ b/tests/test_setup_validation.py
@@ -0,0 +1,74 @@
+"""
+Validation tests to ensure testing infrastructure is properly set up.
+These tests verify that the testing environment works correctly.
+"""
+import pytest
+from pathlib import Path
+import video_converter
+
+
+class TestSetupValidation:
+    """Tests to validate the testing setup is working correctly."""
+
+    def test_pytest_is_working(self):
+        """Test that pytest is functioning."""
+        assert True
+
+    def test_can_import_package(self):
+        """Test that the main package can be imported."""
+        assert video_converter is not None
+
+    def test_coverage_is_enabled(self, pytestconfig):
+        """Test that coverage reporting is enabled."""
+        plugins = [plugin.__class__.__name__ for plugin in pytestconfig.pluginmanager.get_plugins()]
+        # Coverage plugin should be loaded
+        assert any('cov' in plugin.lower() for plugin in plugins)
+
+    def test_temp_dir_fixture(self, temp_dir):
+        """Test that temp_dir fixture works."""
+        assert temp_dir.exists()
+        assert temp_dir.is_dir()
+
+    def test_mock_logger_fixture(self, mock_logger):
+        """Test that mock_logger fixture works."""
+        mock_logger.info("test message")
+        mock_logger.info.assert_called_once_with("test message")
+
+    def test_sample_file_fixtures(self, sample_audio_file, sample_video_file):
+        """Test that sample file fixtures work."""
+        assert sample_audio_file.exists()
+        assert sample_video_file.exists()
+        assert sample_audio_file.suffix == '.wav'
+        assert sample_video_file.suffix == '.mp4'
+
+    def test_project_structure_exists(self):
+        """Test that expected project structure exists."""
+        project_root = Path(__file__).parent.parent
+        
+        expected_files = [
+            'main.py',
+            'requirements.txt',
+            'pyproject.toml',
+            'video_converter/__init__.py',
+            'video_converter/file_utils.py',
+            'video_converter/log_utils.py', 
+            'video_converter/voice_utils.py'
+        ]
+        
+        for file_path in expected_files:
+            assert (project_root / file_path).exists(), f"Missing: {file_path}"
+
+    @pytest.mark.unit
+    def test_unit_marker_works(self):
+        """Test that unit test marker works."""
+        assert True
+
+    @pytest.mark.integration  
+    def test_integration_marker_works(self):
+        """Test that integration test marker works."""
+        assert True
+
+    @pytest.mark.slow
+    def test_slow_marker_works(self):
+        """Test that slow test marker works."""
+        assert True
\ No newline at end of file
diff --git a/tests/unit/__init__.py b/tests/unit/__init__.py
new file mode 100644
index 0000000..e69de29