diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..35f20b0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,99 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Virtual environments
+venv/
+ENV/
+env/
+.venv/
+.env
+
+# IDEs
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+.project
+.pydevproject
+.settings/
+.DS_Store
+
+# Claude
+.claude/*
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# Project specific
+*.h5
+*.pik
+*.log
+*.out
+
+# Model checkpoints
+checkpoints/
+saved_models/
+model_weights/
+
+# Data files (keep the ones in data/ directory)
+!/data/
\ No newline at end of file
diff --git a/CLAUDE.md b/CLAUDE.md
new file mode 100644
index 0000000..55fb32b
--- /dev/null
+++ b/CLAUDE.md
@@ -0,0 +1,25 @@
+# Project Setup
+
+This file contains project-specific information for Claude.
+
+## Testing Commands
+- Run tests: poetry run test or poetry run tests
+- Run with coverage: poetry run pytest --cov
+- Run unit tests only: poetry run pytest tests/unit
+- Run integration tests only: poetry run pytest tests/integration
+- Run with verbose output: poetry run pytest -v
+- Run specific test file: poetry run pytest tests/test_file.py
+- Run tests with specific marker: poetry run pytest -m unit
+
+Note: Coverage threshold is currently set to 0% for initial setup. Update to 80% in pyproject.toml when ready.
+
+## Code Quality Commands
+- Linting: TBD
+- Type checking: TBD
+
+## Project Structure
+- Main source code: model/ and root .py files
+- Tests: tests/
+- Documentation: docs/
+- Testing config: pyproject.toml
+
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..fc03aa9
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,282 @@
+# This file is automatically @generated by Poetry 2.1.3 and should not be changed by hand.
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
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+groups = ["dev"]
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+]
+
+[[package]]
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+test = ["pytest (>=6)"]
+
+[[package]]
+name = "iniconfig"
+version = "2.1.0"
+description = "brain-dead simple config-ini parsing"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
+    {file = "iniconfig-2.1.0-py3-none-any.whl", hash = "sha256:9deba5723312380e77435581c6bf4935c94cbfab9b1ed33ef8d238ea168eb760"},
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+
+[[package]]
+name = "packaging"
+version = "25.0"
+description = "Core utilities for Python packages"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
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+
+[[package]]
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+version = "1.5.0"
+description = "plugin and hook calling mechanisms for python"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
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+]
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
+[[package]]
+name = "pytest"
+version = "7.4.4"
+description = "pytest: simple powerful testing with Python"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+files = [
+    {file = "pytest-7.4.4-py3-none-any.whl", hash = "sha256:b090cdf5ed60bf4c45261be03239c2c1c22df034fbffe691abe93cd80cea01d8"},
+    {file = "pytest-7.4.4.tar.gz", hash = "sha256:2cf0005922c6ace4a3e2ec8b4080eb0d9753fdc93107415332f50ce9e7994280"},
+]
+
+[package.dependencies]
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+exceptiongroup = {version = ">=1.0.0rc8", markers = "python_version < \"3.11\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+tomli = {version = ">=1.0.0", markers = "python_version < \"3.11\""}
+
+[package.extras]
+testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
+
+[[package]]
+name = "pytest-cov"
+version = "4.1.0"
+description = "Pytest plugin for measuring coverage."
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+files = [
+    {file = "pytest-cov-4.1.0.tar.gz", hash = "sha256:3904b13dfbfec47f003b8e77fd5b589cd11904a21ddf1ab38a64f204d6a10ef6"},
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+]
+
+[package.dependencies]
+coverage = {version = ">=5.2.1", extras = ["toml"]}
+pytest = ">=4.6"
+
+[package.extras]
+testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
+
+[[package]]
+name = "pytest-mock"
+version = "3.14.1"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
+    {file = "pytest_mock-3.14.1-py3-none-any.whl", hash = "sha256:178aefcd11307d874b4cd3100344e7e2d888d9791a6a1d9bfe90fbc1b74fd1d0"},
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+]
+
+[package.dependencies]
+pytest = ">=6.2.5"
+
+[package.extras]
+dev = ["pre-commit", "pytest-asyncio", "tox"]
+
+[[package]]
+name = "tomli"
+version = "2.2.1"
+description = "A lil' TOML parser"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_full_version <= \"3.11.0a6\""
+files = [
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+    {file = "tomli-2.2.1-cp313-cp313-win32.whl", hash = "sha256:d3f5614314d758649ab2ab3a62d4f2004c825922f9e370b29416484086b264ec"},
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+]
+
+[[package]]
+name = "typing-extensions"
+version = "4.13.2"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+markers = "python_version < \"3.11\""
+files = [
+    {file = "typing_extensions-4.13.2-py3-none-any.whl", hash = "sha256:a439e7c04b49fec3e5d3e2beaa21755cadbbdc391694e28ccdd36ca4a1408f8c"},
+    {file = "typing_extensions-4.13.2.tar.gz", hash = "sha256:e6c81219bd689f51865d9e372991c540bda33a0379d5573cddb9a3a23f7caaef"},
+]
+
+[metadata]
+lock-version = "2.1"
+python-versions = "^3.8"
+content-hash = "efdca0eb8a7a2e6df51d16744ffb85e2e1441368b401633448342871b642367b"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..2a2405b
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,74 @@
+[tool.poetry]
+name = "bert-nlp-project"
+version = "0.1.0"
+description = "BERT-based NLP model implementation"
+authors = ["Your Name <your.email@example.com>"]
+readme = "README.md"
+packages = [{include = "model"}, {include = "*.py"}]
+
+[tool.poetry.dependencies]
+python = "^3.8"
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^7.4.3"
+pytest-cov = "^4.1.0"
+pytest-mock = "^3.12.0"
+
+[tool.poetry.scripts]
+test = "pytest:main"
+tests = "pytest:main"
+
+[tool.pytest.ini_options]
+minversion = "7.0"
+addopts = [
+    "-ra",
+    "--strict-markers",
+    "--cov=.",
+    "--cov-branch",
+    "--cov-report=term-missing:skip-covered",
+    "--cov-report=html",
+    "--cov-report=xml",
+    "--cov-fail-under=0",
+]
+testpaths = ["tests"]
+python_files = ["test_*.py", "*_test.py", "testing/python/*.py"]
+markers = [
+    "unit: Unit tests",
+    "integration: Integration tests", 
+    "slow: Tests that take a long time to run",
+]
+
+[tool.coverage.run]
+source = ["."]
+omit = [
+    "*/tests/*",
+    "*/test_*",
+    "*_test.py",
+    "setup.py",
+    "*/venv/*",
+    "*/.venv/*",
+    "*/virtualenv/*",
+    "*/.tox/*",
+    "*/.pytest_cache/*",
+    "*/__pycache__/*",
+    "*/site-packages/*",
+]
+
+[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__.:",
+    "if TYPE_CHECKING:",
+    "class .*\\bProtocol\\):",
+    "@(abc\\.)?abstractmethod",
+]
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
\ 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..63de4d0
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,114 @@
+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_dir = tempfile.mkdtemp()
+    yield Path(temp_dir)
+    shutil.rmtree(temp_dir)
+
+
+@pytest.fixture
+def mock_config():
+    """Mock configuration object for testing."""
+    config = Mock()
+    config.batch_size = 32
+    config.learning_rate = 0.001
+    config.epochs = 10
+    config.hidden_size = 768
+    config.num_attention_heads = 12
+    config.num_hidden_layers = 12
+    config.vocab_size = 30522
+    config.max_position_embeddings = 512
+    config.intermediate_size = 3072
+    config.hidden_act = "gelu"
+    config.hidden_dropout_prob = 0.1
+    config.attention_probs_dropout_prob = 0.1
+    return config
+
+
+@pytest.fixture
+def mock_model():
+    """Mock model object for testing."""
+    model = MagicMock()
+    model.predict = MagicMock(return_value=[0.1, 0.9])
+    model.train = MagicMock()
+    model.evaluate = MagicMock(return_value={"loss": 0.5, "accuracy": 0.85})
+    return model
+
+
+@pytest.fixture
+def sample_text_data():
+    """Sample text data for testing."""
+    return [
+        "This is a sample sentence for testing.",
+        "Another example text for our tests.",
+        "BERT models are powerful for NLP tasks.",
+    ]
+
+
+@pytest.fixture
+def sample_tokenized_data():
+    """Sample tokenized data for testing."""
+    return {
+        "input_ids": [[101, 2023, 2003, 1037, 6876, 102], 
+                      [101, 2178, 2742, 3793, 102],
+                      [101, 14324, 2819, 2024, 3928, 102]],
+        "attention_mask": [[1, 1, 1, 1, 1, 1],
+                          [1, 1, 1, 1, 1],
+                          [1, 1, 1, 1, 1, 1]],
+        "token_type_ids": [[0, 0, 0, 0, 0, 0],
+                          [0, 0, 0, 0, 0],
+                          [0, 0, 0, 0, 0, 0]]
+    }
+
+
+@pytest.fixture
+def mock_data_loader():
+    """Mock data loader for testing."""
+    loader = Mock()
+    loader.__iter__ = Mock(return_value=iter([
+        {"inputs": "sample1", "labels": 0},
+        {"inputs": "sample2", "labels": 1},
+    ]))
+    loader.__len__ = Mock(return_value=2)
+    return loader
+
+
+@pytest.fixture
+def capture_stdout(monkeypatch):
+    """Capture stdout for testing print statements."""
+    import io
+    import sys
+    
+    captured_output = io.StringIO()
+    monkeypatch.setattr(sys, 'stdout', captured_output)
+    yield captured_output
+    captured_output.close()
+
+
+@pytest.fixture(autouse=True)
+def reset_random_seeds():
+    """Reset random seeds for reproducible tests."""
+    import random
+    
+    random.seed(42)
+    
+    try:
+        import numpy as np
+        np.random.seed(42)
+    except ImportError:
+        pass
+    
+    try:
+        import torch
+        torch.manual_seed(42)
+        if torch.cuda.is_available():
+            torch.cuda.manual_seed_all(42)
+    except ImportError:
+        pass
\ 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_infrastructure_validation.py b/tests/test_infrastructure_validation.py
new file mode 100644
index 0000000..c4c4e83
--- /dev/null
+++ b/tests/test_infrastructure_validation.py
@@ -0,0 +1,63 @@
+import pytest
+from pathlib import Path
+
+
+class TestInfrastructureValidation:
+    """Validation tests to ensure the testing infrastructure is properly set up."""
+    
+    def test_pytest_is_working(self):
+        """Basic test to verify pytest is running."""
+        assert True
+    
+    def test_fixtures_are_available(self, temp_dir, mock_config, mock_model):
+        """Test that our custom fixtures are working."""
+        assert isinstance(temp_dir, Path)
+        assert temp_dir.exists()
+        
+        assert hasattr(mock_config, 'batch_size')
+        assert mock_config.batch_size == 32
+        
+        assert hasattr(mock_model, 'predict')
+        result = mock_model.predict()
+        assert result == [0.1, 0.9]
+    
+    def test_markers_are_defined(self):
+        """Test that custom markers are available."""
+        markers = pytest.mark._markers
+        assert 'unit' in markers or hasattr(pytest.mark, 'unit')
+        assert 'integration' in markers or hasattr(pytest.mark, 'integration')
+        assert 'slow' in markers or hasattr(pytest.mark, 'slow')
+    
+    @pytest.mark.unit
+    def test_unit_marker(self):
+        """Test with unit marker."""
+        assert 1 + 1 == 2
+    
+    @pytest.mark.integration
+    def test_integration_marker(self):
+        """Test with integration marker."""
+        assert "integration" in "integration test"
+    
+    def test_project_structure_exists(self):
+        """Verify the project structure is as expected."""
+        project_root = Path(__file__).parent.parent
+        
+        assert project_root.exists()
+        assert (project_root / "model").exists()
+        assert (project_root / "tests").exists()
+        assert (project_root / "tests" / "unit").exists()
+        assert (project_root / "tests" / "integration").exists()
+        assert (project_root / "pyproject.toml").exists()
+    
+    def test_coverage_is_configured(self):
+        """Test that coverage is properly configured."""
+        project_root = Path(__file__).parent.parent
+        pyproject_path = project_root / "pyproject.toml"
+        
+        assert pyproject_path.exists()
+        
+        with open(pyproject_path, 'r') as f:
+            content = f.read()
+            assert "[tool.coverage.run]" in content
+            assert "[tool.pytest.ini_options]" in content
+            assert "--cov" in content
\ 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