Add unit tests and GitHub Actions workflow

.github/workflows/python-tests.yml

@@ -0,0 +1,33 @@
+name: Python Tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.10'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    
+    - name: Install Tkinter
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y python3-tk
+    
+    - name: Run tests
+      run: |
+        python -m unittest test_typing_speed.py -v

test_typing_speed.py

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+import unittest
+from main import TypingSpeedTest
+import tkinter as tk
+
+class TestTypingSpeedTest(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.root = tk.Tk()
+        cls.app = TypingSpeedTest(cls.root)
+
+    def setUp(self):
+        self.app.display_text.delete('1.0', tk.END)
+        self.app.current_text = ""
+        self.app.start_time = None
+        self.app.word_count = 25
+
+    def test_initial_state(self):
+        """Test the initial state of the application"""
+        self.assertIsNone(self.app.start_time)
+        self.assertEqual(self.app.word_count, 25)
+        self.assertEqual(self.app.current_text, "")
+
+    def test_word_list(self):
+        """Test that word list exists and is not empty"""
+        self.assertGreater(len(self.app.word_list), 0)
+        self.assertIsInstance(self.app.word_list, list)
+        self.assertTrue(all(isinstance(word, str) for word in self.app.word_list))
+
+    def test_window_properties(self):
+        """Test window properties"""
+        self.assertEqual(self.app.root.title(), "Typing Speed Test")
+        # Check that geometry is set (format should be WxH or WxH+X+Y)
+        geometry = self.app.root.geometry()
+        self.assertRegex(geometry, r'\d+x\d+(?:\+\d+\+\d+)?')
+
+    def test_ui_elements(self):
+        """Test that main UI elements exist"""
+        self.assertIsInstance(self.app.display_text, tk.Text)
+        self.assertIsInstance(self.app.text_frame, tk.Frame)
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.destroy()
+
+if __name__ == '__main__':
+    unittest.main()