style: format code with Black

This commit fixes the style issues introduced in ad548ea according to the output
from Black.

Details: #180

Author: deepsource-autofix[bot]

tests/test_gui.py

@@ -14,53 +14,60 @@
 
 class TestGUIImports:
     """Test that GUI module can be imported and has necessary components."""
-    
+
     def test_gui_module_exists(self):
         """Test that gui module can be imported."""
         try:
             import gui
+
             assert True
         except ImportError as e:
-            pytest.skip(f"GUI module import failed (expected if tkinter not available): {e}")
-    
+            pytest.skip(
+                f"GUI module import failed (expected if tkinter not available): {e}"
+            )
+
     def test_gui_has_tkinter_components(self):
         """Test that GUI has tkinter components if available."""
         try:
             import gui
+
             # Check if basic GUI components are defined
-            assert hasattr(gui, 'window') or True  # GUI might not initialize in headless environment
+            assert (
+                hasattr(gui, "window") or True
+            )  # GUI might not initialize in headless environment
         except ImportError:
             pytest.skip("GUI module not available")
 
 
 class TestPercentageFunction:
     """Test the percentage calculation function."""
-    
+
     def test_percentages_function_exists(self):
         """Test that percentages function exists in GUI module."""
         try:
             import gui
-            assert hasattr(gui, 'percentages')
+
+            assert hasattr(gui, "percentages")
         except ImportError:
             pytest.skip("GUI module not available")
-    
+
     def test_percentages_calculation(self):
         """Test percentage calculation for different locations."""
         try:
             import gui
-            
+
             # Test first position
             result = gui.percentages(0)
-            assert result == '8'
-            
+            assert result == "8"
+
             # Test middle position
             result = gui.percentages(5)
-            assert result == '50'
-            
+            assert result == "50"
+
             # Test last position
             result = gui.percentages(11)
-            assert result == '100'
-            
+            assert result == "100"
+
         except ImportError:
             pytest.skip("GUI module not available")
         except Exception as e:
@@ -69,12 +76,13 @@ def test_percentages_calculation(self):
 
 class TestGUIComponents:
     """Test GUI window and component initialization."""
-    
+
     def test_window_title(self):
         """Test that window has correct title."""
         try:
             import gui
-            if hasattr(gui, 'window'):
+
+            if hasattr(gui, "window"):
                 # In headless environment, this might not work
                 # but we can check the module was imported
                 assert True
@@ -84,5 +92,5 @@ def test_window_title(self):
             pytest.skip(f"GUI test skipped in headless environment: {e}")
 
 
-if __name__ == '__main__':
-    pytest.main([__file__, '-v'])
+if __name__ == "__main__":
+    pytest.main([__file__, "-v"])