diff --git a/.gitignore b/.gitignore
index 6504c80..c2790bc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -173,3 +173,7 @@ cython_debug/
 
 # PyPI configuration file
 .pypirc
+
+# IDE
+.vscode/
+.idea/
diff --git a/README.md b/README.md
index f9240ca..160b882 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ pip install -r requirements.txt
 
 Run the main script to generate lottery draws:
 ```bash
-python src/main.py
+python main.py
 ```
 
 The program will:
@@ -60,9 +60,27 @@ The application uses a combination of entropy sources to generate truly random l
 
 All sources are combined, hashed, and processed to create seeds for the random number generator that selects the lottery numbers.
 
+## Testing
+
+Unit tests are included to verify the functionality of all major components.
+
+### Running Tests
+
+Run the test suite with pytest:
+
+```bash
+python -m pytest test/
+```
+
+For a coverage report:
+
+```bash
+python -m pytest --cov-report term --cov=./fdj_slayer test/
+```
+
 ## Configuration
 
-Edit the constants in ``scr/constants.py`` to modify:
+Edit the constants in ``src/constants.py`` to modify:
 
 | Parameter              | Description                                           |
 |------------------------|-------------------------------------------------------|
diff --git a/conftest.py b/conftest.py
new file mode 100644
index 0000000..aa9b0ad
--- /dev/null
+++ b/conftest.py
@@ -0,0 +1,7 @@
+"""
+Add the parent directory to the sys.path so the tests can import the modules from the parent dir.
+"""
+import os
+import sys
+
+sys.path.insert(0, os.path.abspath(os.path.dirname(__file__)))
diff --git a/fdj_slayer/__init__.py b/fdj_slayer/__init__.py
new file mode 100644
index 0000000..552d51a
--- /dev/null
+++ b/fdj_slayer/__init__.py
@@ -0,0 +1 @@
+# Empty file to make directory a package
diff --git a/src/constants.py b/fdj_slayer/constants.py
similarity index 100%
rename from src/constants.py
rename to fdj_slayer/constants.py
diff --git a/src/draw.py b/fdj_slayer/draw.py
similarity index 98%
rename from src/draw.py
rename to fdj_slayer/draw.py
index d86d6ce..064c5f7 100644
--- a/src/draw.py
+++ b/fdj_slayer/draw.py
@@ -16,7 +16,7 @@ import multiprocessing
 import psutil
 from progress.bar import Bar
 
-from constants import MAX_NUMBER, MAX_STAR, NUMBER_OF_NUMBERS, NUMBER_OF_STARS
+from .constants import MAX_NUMBER, MAX_STAR, NUMBER_OF_NUMBERS, NUMBER_OF_STARS
 
 
 class Draw:
diff --git a/src/weather.py b/fdj_slayer/weather.py
similarity index 96%
rename from src/weather.py
rename to fdj_slayer/weather.py
index 8887ec0..ef993d9 100644
--- a/src/weather.py
+++ b/fdj_slayer/weather.py
@@ -9,7 +9,7 @@ import openmeteo_requests
 import requests_cache
 from retry_requests import retry
 
-from constants import OPENMETEO_API_URL, OPENMETEO_HOURLY_PARAMS
+from .constants import OPENMETEO_API_URL, OPENMETEO_HOURLY_PARAMS
 
 
 class Weather:
diff --git a/src/main.py b/main.py
similarity index 87%
rename from src/main.py
rename to main.py
index 37280ef..92bb05c 100644
--- a/src/main.py
+++ b/main.py
@@ -5,9 +5,9 @@ This script generates random draws for EuroMillions using various entropy source
 import random
 import numpy as _
 
-from draw import Draw
-from weather import Weather
-from constants import NUMBER_OF_DRAWS
+from fdj_slayer.draw import Draw
+from fdj_slayer.weather import Weather
+from fdj_slayer.constants import NUMBER_OF_DRAWS
 
 
 def main():
diff --git a/requirements.txt b/requirements.txt
index 94f212c..8f69ab6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,6 @@ psutil==7.0.0
 requests-cache==1.2.1
 retry-requests==2.0.0
 numpy==2.2.4
+pytest==8.3.5
+pytest-cov==6.0.0
+pytest-mock==3.14.0
diff --git a/test/__init__.py b/test/__init__.py
new file mode 100644
index 0000000..552d51a
--- /dev/null
+++ b/test/__init__.py
@@ -0,0 +1 @@
+# Empty file to make directory a package
diff --git a/test/draw_test.py b/test/draw_test.py
new file mode 100644
index 0000000..ec7929d
--- /dev/null
+++ b/test/draw_test.py
@@ -0,0 +1,119 @@
+"""
+Unit tests for the Draw class.
+"""
+
+import unittest
+from unittest.mock import patch, MagicMock
+from io import StringIO
+import sys
+from fdj_slayer.draw import Draw
+from fdj_slayer.constants import NUMBER_OF_NUMBERS, NUMBER_OF_STARS
+
+
+class TestDraw(unittest.TestCase):
+    """Test suite for the Draw class"""
+
+    def setUp(self):
+        """Set up test fixtures"""
+        self.mock_weather = MagicMock()
+        self.mock_weather.get_weather_entropy.return_value = "a" * 64
+        self.draw = Draw(self.mock_weather)
+
+    def test_get_static_entropy_pool(self):
+        """Test the static entropy pool generation"""
+        pool = self.draw.get_static_entropy_pool()
+
+        self.assertIsInstance(pool, list)
+        self.assertIn("a" * 64, pool)
+        self.assertEqual(len(pool), 9)
+
+    def test_get_dynamic_entropy_pool(self):
+        """Test that dynamic entropy pool returns different values"""
+        pool1 = self.draw.get_dynamic_entropy_pool()
+        pool2 = self.draw.get_dynamic_entropy_pool()
+
+        self.assertIsInstance(pool1, list)
+        self.assertIsInstance(pool2, list)
+        self.assertEqual(len(pool1), len(pool2))
+        self.assertNotEqual(pool1, pool2)
+
+    def test_generate_seed(self):
+        """Test that seed generation produces an integer from entropy pool"""
+        base_pool = ["test1", "test2"]
+        seed = self.draw.generate_seed(base_pool)
+
+        self.assertIsInstance(seed, int)
+
+    @patch('fdj_slayer.draw.random')
+    def test_make_draw(self, mock_random):
+        """Test the draw creation with specified numbers and stars"""
+        mock_random.seed.return_value = None
+        mock_random.sample.side_effect = [
+            [10, 20, 30, 40, 50],
+            [5, 10]
+        ]
+
+        draw = self.draw.make_draw(["test_entropy"])
+
+        self.assertIn("seed", draw)
+        self.assertIn("numbers", draw)
+        self.assertIn("stars", draw)
+        self.assertEqual(len(draw["numbers"]), NUMBER_OF_NUMBERS)
+        self.assertEqual(len(draw["stars"]), NUMBER_OF_STARS)
+        self.assertEqual(draw["numbers"], [10, 20, 30, 40, 50])
+        self.assertEqual(draw["stars"], [5, 10])
+
+    @patch('fdj_slayer.draw.Bar')
+    def test_generate_draws(self, mock_bar):
+        """Test generation of multiple draws"""
+        mock_bar_instance = mock_bar.return_value
+
+        self.draw.make_draw = MagicMock(
+            side_effect=[{"numbers": [1, 2, 3, 4, 5],
+                          "stars": [1, 2], "seed": i} for i in range(3)]
+        )
+
+        draws = self.draw.generate_draws(3)
+
+        self.assertEqual(len(draws), 3)
+        mock_bar_instance.next.assert_called()
+        mock_bar_instance.finish.assert_called_once()
+
+    def test_display_draw(self):
+        """Test draw display formatting"""
+        captured_output = StringIO()
+        sys.stdout = captured_output
+
+        try:
+            draw = {"numbers": [1, 2, 3, 4, 5], "stars": [1, 2], "seed": 12345}
+            self.draw.display_draw(draw, index=0, title="TEST")
+
+            output = captured_output.getvalue()
+            self.assertIn("TEST", output)
+            self.assertIn("[1, 2, 3, 4, 5]", output)
+            self.assertIn("[1, 2]", output)
+        finally:
+            sys.stdout = sys.__stdout__
+
+    @patch('builtins.input')
+    def test_display_additional_draws(self, mock_input):
+        """Test the additional draws display functionality"""
+        mock_input.side_effect = ['y', 'n']
+
+        self.draw.display_draw = MagicMock()
+
+        draws = [
+            {"numbers": [1, 2, 3, 4, 5], "stars": [1, 2], "seed": 1},
+            {"numbers": [6, 7, 8, 9, 10], "stars": [3, 4], "seed": 2},
+            {"numbers": [11, 12, 13, 14, 15], "stars": [5, 6], "seed": 3}
+        ]
+        displayed_draws = {0}
+
+        self.draw.display_additional_draws(draws, displayed_draws)
+
+        self.assertEqual(len(displayed_draws), 2)
+        self.draw.display_draw.assert_called_once()
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/test/weather_test.py b/test/weather_test.py
new file mode 100644
index 0000000..a642887
--- /dev/null
+++ b/test/weather_test.py
@@ -0,0 +1,37 @@
+"""
+Unit tests for the Weather class.
+"""
+
+import unittest
+from unittest.mock import patch
+from fdj_slayer.weather import Weather
+
+
+class TestWeather(unittest.TestCase):
+    """Test suite for the Weather class"""
+
+    def setUp(self):
+        self.weather = Weather()
+
+    @patch('fdj_slayer.weather.Weather._get_weather_data')
+    def test_get_weather_entropy_success(self, mock_get_data):
+        """Test the get_weather_entropy method"""
+        expected_hash = "a" * 64
+        mock_get_data.return_value = expected_hash
+
+        result = self.weather.get_weather_entropy()
+        self.assertEqual(result, expected_hash)
+
+    @patch('fdj_slayer.weather.Weather._get_weather_data')
+    def test_get_weather_entropy_fallback(self, mock_get_data):
+        """Test the get_weather_entropy method when the API fails"""
+        mock_get_data.side_effect = Exception("API Error")
+
+        result = self.weather.get_weather_entropy()
+
+        self.assertEqual(len(result), 64)
+        self.assertTrue(all(c in '0123456789abcdef' for c in result))
+
+
+if __name__ == '__main__':
+    unittest.main()