diff --git a/.github/workflows/test-and-build.yml b/.github/workflows/test-and-build.yml
new file mode 100644
index 0000000..68ef218
--- /dev/null
+++ b/.github/workflows/test-and-build.yml
@@ -0,0 +1,88 @@
+name: Test and Build
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.12]
+
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e ".[dev]"
+    
+    - name: Run tests with coverage
+      run: |
+        PYTHONPATH=$PYTHONPATH:$(pwd) pytest tests/ --cov=. --cov-report=xml
+    
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v4
+      with:
+        file: ./coverage.xml
+        fail_ci_if_error: true
+
+  build:
+    needs: test
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    
+    - name: Build and push
+      uses: docker/build-push-action@v5
+      with:
+        context: .
+        push: true
+        tags: |
+          ghcr.io/mnofresno/convcommitgpt:latest
+          ghcr.io/mnofresno/convcommitgpt:${{ github.sha }}
+        platforms: linux/amd64,linux/arm64
+
+  test-install:
+    needs: build
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    
+    steps:
+    - uses: actions/checkout@v4
+    
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v3
+    
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    
+    - name: Test installation
+      run: |
+        chmod +x test_install.sh
+        ./test_install.sh 
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index 62545a8..23d6e0b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,8 +16,10 @@ ENV OLLAMA_HOST=host.docker.internal
 ENV OLLAMA_PORT=11434
 
 # Copy application files
-COPY *.py ./
-COPY *.md ./
+COPY . .
+
+# Install the package
+RUN pip install -e .
 
 # Set the entrypoint
-ENTRYPOINT ["python", "convcommit.py"]
+ENTRYPOINT ["python", "-m", "convcommitgpt.convcommit"]
diff --git a/__init__.py b/__init__.py
new file mode 100644
index 0000000..f195549
--- /dev/null
+++ b/__init__.py
@@ -0,0 +1,5 @@
+"""
+ConvCommitGPT - A tool to generate commit messages using AI
+"""
+
+__version__ = "1.0.0" 
\ No newline at end of file
diff --git a/build_and_push.sh b/build_and_push.sh
index 03a4563..1fb6130 100755
--- a/build_and_push.sh
+++ b/build_and_push.sh
@@ -54,17 +54,14 @@ prepare_build_dir() {
     BUILD_DIR=$(mktemp -d)
     print_message "Created build directory: $BUILD_DIR" "$GREEN"
     
-    # Copy all Python files, requirements.txt, and markdown files
-    cp *.py "$BUILD_DIR/" 2>/dev/null || true
-    cp requirements.txt "$BUILD_DIR/" 2>/dev/null || true
-    cp *.md "$BUILD_DIR/" 2>/dev/null || true
-    cp Dockerfile "$BUILD_DIR/"
+    # Copy all files to build directory
+    cp -r . "$BUILD_DIR/"
     
     # Change to build directory
     cd "$BUILD_DIR"
     
     # Verify essential files exist
-    if [ ! -f "requirements.txt" ] || [ ! -f "convcommit.py" ] || [ ! -f "Dockerfile" ]; then
+    if [ ! -f "setup.py" ] || [ ! -f "requirements.txt" ] || [ ! -f "Dockerfile" ]; then
         print_message "Error: Essential files are missing" "$RED"
         return 1
     fi
diff --git a/assistant.py b/convcommitgpt/assistant.py
similarity index 100%
rename from assistant.py
rename to convcommitgpt/assistant.py
diff --git a/convcommit.py b/convcommitgpt/convcommit.py
similarity index 100%
rename from convcommit.py
rename to convcommitgpt/convcommit.py
diff --git a/diff_generator.py b/convcommitgpt/diff_generator.py
similarity index 100%
rename from diff_generator.py
rename to convcommitgpt/diff_generator.py
diff --git a/runner.py b/convcommitgpt/runner.py
similarity index 100%
rename from runner.py
rename to convcommitgpt/runner.py
diff --git a/install.sh b/install.sh
index 461ddf6..a649f96 100755
--- a/install.sh
+++ b/install.sh
@@ -121,11 +121,7 @@ download_files() {
     print_message "Downloading files..." "$YELLOW"
     cd /tmp
     local files=(
-        "convcommit.py"
-        "assistant.py"
-        "diff_generator.py"
-        "runner.py"
-        "spinner.py"
+        "setup.py"
         "requirements.txt"
         "instructions_prompt.md"
         "convcommit.sh"
@@ -138,8 +134,19 @@ download_files() {
         fi
     done
 
+    # Download the package directory
+    if ! curl -sSL "https://github.com/mnofresno/convcommitgpt/archive/refs/heads/main.zip" -o "main.zip"; then
+        print_message "Error: Failed to download package" "$RED"
+        exit 1
+    fi
+
+    # Extract the package
+    unzip -q main.zip
+    rm main.zip
+
     print_message "Copying files to installation directory..." "$YELLOW"
-    cp -r /tmp/*.py /tmp/*.txt /tmp/*.md /tmp/convcommit.sh ~/.local/lib/convcommitgpt/
+    cp -r convcommitgpt-main/convcommitgpt ~/.local/lib/convcommitgpt/
+    cp /tmp/*.py /tmp/*.txt /tmp/*.md /tmp/convcommit.sh ~/.local/lib/convcommitgpt/
     cd -
 }
 
diff --git a/requirements.txt b/requirements.txt
index 5fc415e..9571cef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,7 @@
 click==8.1.7
 openai>=1.12.0
 gitpython==3.1.43
-python-dotenv==1.0.1
\ No newline at end of file
+python-dotenv==1.0.1
+pytest==8.0.0
+pytest-cov==4.1.0
+pytest-mock==3.12.0
\ No newline at end of file
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..78a9607
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,25 @@
+from setuptools import setup, find_packages
+
+setup(
+    name="convcommitgpt",
+    version="1.0.0",
+    packages=find_packages(),
+    install_requires=[
+        "click==8.1.7",
+        "openai>=1.12.0",
+        "gitpython==3.1.43",
+        "python-dotenv==1.0.1",
+    ],
+    extras_require={
+        "dev": [
+            "pytest==8.0.0",
+            "pytest-cov==4.1.0",
+            "pytest-mock==3.12.0",
+        ],
+    },
+    entry_points={
+        "console_scripts": [
+            "convcommit=convcommitgpt.convcommit:main",
+        ],
+    },
+) 
\ No newline at end of file
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..c13dbda
--- /dev/null
+++ b/tests/__init__.py
@@ -0,0 +1,3 @@
+"""
+Test suite for ConvCommitGPT
+""" 
\ No newline at end of file
diff --git a/tests/test_assistant.py b/tests/test_assistant.py
new file mode 100644
index 0000000..758bfee
--- /dev/null
+++ b/tests/test_assistant.py
@@ -0,0 +1,44 @@
+import pytest
+from unittest.mock import Mock, patch
+from convcommitgpt.assistant import Assistant
+
+@pytest.fixture
+def mock_response():
+    return {
+        "choices": [
+            {
+                "message": {
+                    "content": "Test commit message"
+                }
+            }
+        ]
+    }
+
+@pytest.fixture
+def assistant():
+    return Assistant(api_url="http://test.com", api_key="test-key")
+
+def test_assistant_initialization():
+    assistant = Assistant(api_url="http://test.com", api_key="test-key")
+    assert assistant.api_url == "http://test.com"
+    assert assistant.api_key == "test-key"
+
+@patch('assistant.httpx.post')
+def test_assist_success(mock_post, assistant, mock_response):
+    mock_post.return_value.json.return_value = mock_response
+    mock_post.return_value.status_code = 200
+    
+    result = assistant.assist("test diff", "test prompt", "test model")
+    
+    assert result == "Test commit message"
+    mock_post.assert_called_once()
+
+@patch('assistant.httpx.post')
+def test_assist_error(mock_post, assistant):
+    mock_post.return_value.status_code = 400
+    mock_post.return_value.text = "Error message"
+    
+    with pytest.raises(Exception) as exc_info:
+        assistant.assist("test diff", "test prompt", "test model")
+    
+    assert "Error message" in str(exc_info.value) 
\ No newline at end of file
diff --git a/tests/test_convcommit.py b/tests/test_convcommit.py
new file mode 100644
index 0000000..041a6fc
--- /dev/null
+++ b/tests/test_convcommit.py
@@ -0,0 +1,75 @@
+import pytest
+from unittest.mock import Mock, patch
+from io import StringIO
+from convcommitgpt.convcommit import main
+
+@pytest.fixture
+def mock_diff_generator():
+    with patch('convcommit.DiffGenerator') as mock:
+        mock.return_value.generate.return_value = "test diff"
+        yield mock
+
+@pytest.fixture
+def mock_assistant():
+    with patch('convcommit.Assistant') as mock:
+        instance = Mock()
+        instance.assist.return_value = "Test commit message"
+        mock.return_value = instance
+        yield mock
+
+@pytest.fixture
+def mock_runner():
+    with patch('convcommit.Runner') as mock:
+        instance = Mock()
+        instance.generate.return_value = "Test commit message"
+        mock.return_value = instance
+        yield mock
+
+def test_main_with_repository_path(mock_diff_generator, mock_assistant, mock_runner):
+    with patch('convcommit.click.echo') as mock_echo:
+        main(
+            repository_path="/test/repo",
+            prompt_file="test_prompt.md",
+            model="test-model",
+            openai_api_key="test-key",
+            base_url="http://test.com",
+            diff_from_stdin=None,
+            debug_diff=False,
+            max_bytes_in_diff=1024,
+            verbose=False
+        )
+        
+        mock_echo.assert_called_with("Test commit message")
+
+def test_main_with_stdin(mock_assistant, mock_runner):
+    with patch('convcommit.click.echo') as mock_echo:
+        stdin = StringIO("test diff")
+        main(
+            repository_path=None,
+            prompt_file="test_prompt.md",
+            model="test-model",
+            openai_api_key="test-key",
+            base_url="http://test.com",
+            diff_from_stdin=stdin,
+            debug_diff=False,
+            max_bytes_in_diff=1024,
+            verbose=False
+        )
+        
+        mock_echo.assert_called_with("Test commit message")
+
+def test_main_no_input():
+    with pytest.raises(SystemExit) as exc_info:
+        main(
+            repository_path=None,
+            prompt_file="test_prompt.md",
+            model="test-model",
+            openai_api_key="test-key",
+            base_url="http://test.com",
+            diff_from_stdin=None,
+            debug_diff=False,
+            max_bytes_in_diff=1024,
+            verbose=False
+        )
+    
+    assert exc_info.value.code == 1 
\ No newline at end of file
diff --git a/tests/test_diff_generator.py b/tests/test_diff_generator.py
new file mode 100644
index 0000000..3b467de
--- /dev/null
+++ b/tests/test_diff_generator.py
@@ -0,0 +1,51 @@
+import pytest
+from pathlib import Path
+from unittest.mock import Mock, patch
+from convcommitgpt.diff_generator import DiffGenerator
+
+@pytest.fixture
+def mock_git_diff():
+    return """diff --git a/test.py b/test.py
+index 1234567..89abcde 100644
+--- a/test.py
++++ b/test.py
+@@ -1,2 +1,3 @@
+ def test():
+-    return True
++    return False
+"""
+
+@pytest.fixture
+def diff_generator():
+    return DiffGenerator(max_bytes=1024)
+
+@patch('diff_generator.subprocess.run')
+def test_generate_diff_success(mock_run, diff_generator, mock_git_diff):
+    mock_run.return_value = Mock(
+        returncode=0,
+        stdout=mock_git_diff.encode(),
+        stderr=b''
+    )
+    
+    result = diff_generator.generate(Path("/test/repo"))
+    
+    assert result == mock_git_diff
+    mock_run.assert_called_once()
+
+@patch('diff_generator.subprocess.run')
+def test_generate_diff_error(mock_run, diff_generator):
+    mock_run.return_value = Mock(
+        returncode=1,
+        stdout=b'',
+        stderr=b'Error: not a git repository'
+    )
+    
+    with pytest.raises(Exception) as exc_info:
+        diff_generator.generate(Path("/test/repo"))
+    
+    assert "Error: not a git repository" in str(exc_info.value)
+
+def test_max_bytes_limit(diff_generator):
+    long_diff = "x" * 2000
+    result = diff_generator._limit_diff_size(long_diff)
+    assert len(result) <= 1024 
\ No newline at end of file
diff --git a/tests/test_runner.py b/tests/test_runner.py
new file mode 100644
index 0000000..43394e8
--- /dev/null
+++ b/tests/test_runner.py
@@ -0,0 +1,41 @@
+import pytest
+from unittest.mock import Mock, patch
+from convcommitgpt.runner import Runner
+from convcommitgpt.assistant import Assistant
+
+@pytest.fixture
+def mock_assistant():
+    return Mock(spec=Assistant)
+
+@pytest.fixture
+def runner(mock_assistant):
+    return Runner(mock_assistant)
+
+def test_runner_initialization():
+    assistant = Mock(spec=Assistant)
+    runner = Runner(assistant)
+    assert runner.assistant == assistant
+
+@patch('runner.open')
+def test_generate_commit_message(mock_open, runner, mock_assistant):
+    # Mock file reading
+    mock_open.return_value.__enter__.return_value.read.return_value = "Test prompt"
+    
+    # Mock assistant response
+    mock_assistant.assist.return_value = "Test commit message"
+    
+    result = runner.generate("test diff", "test_prompt.md", "test-model")
+    
+    assert result == "Test commit message"
+    mock_assistant.assist.assert_called_once_with(
+        "test diff",
+        "Test prompt",
+        "test-model"
+    )
+
+@patch('runner.open')
+def test_generate_commit_message_file_not_found(mock_open, runner):
+    mock_open.side_effect = FileNotFoundError
+    
+    with pytest.raises(FileNotFoundError):
+        runner.generate("test diff", "nonexistent.md", "test-model") 
\ No newline at end of file