Add convenient test runner script

Provides shortcuts for:
- Running all tests
- Running specific test suites
- Running with coverage
- Running with fail-fast
- Passing through to Django test runner

run_tests.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python
+"""
+Test runner script for vgui-cicd project.
+Provides convenient shortcuts for running different test suites.
+"""
+
+import sys
+import os
+from django.core.management import execute_from_command_line
+
+
+def main():
+    """Run tests based on command line arguments."""
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'VorgabenUI.settings')
+    
+    if len(sys.argv) > 1:
+        command = sys.argv[1]
+        
+        if command == 'all':
+            # Run all tests
+            execute_from_command_line(['manage.py', 'test', '--verbosity=2'])
+        
+        elif command == 'cache':
+            # Run only cache tests
+            execute_from_command_line(['manage.py', 'test', 'diagramm_proxy', '--verbosity=2'])
+        
+        elif command == 'render':
+            # Run only rendering tests
+            execute_from_command_line(['manage.py', 'test', 'abschnitte.tests', '--verbosity=2'])
+        
+        elif command == 'commands':
+            # Run only management command tests
+            execute_from_command_line(['manage.py', 'test', 'abschnitte.management.commands', '--verbosity=2'])
+        
+        elif command == 'coverage':
+            # Run tests with coverage
+            try:
+                import coverage
+                cov = coverage.Coverage(source=['.'])
+                cov.start()
+                
+                execute_from_command_line(['manage.py', 'test', '--verbosity=2'])
+                
+                cov.stop()
+                cov.save()
+                
+                print('\n' + '='*70)
+                print('COVERAGE REPORT')
+                print('='*70)
+                cov.report()
+                
+                print('\nHTML coverage report generated in htmlcov/')
+                cov.html_report()
+                
+            except ImportError:
+                print('ERROR: coverage.py not installed.')
+                print('Install with: pip install coverage')
+                sys.exit(1)
+        
+        elif command == 'fast':
+            # Run tests with failfast
+            execute_from_command_line(['manage.py', 'test', '--failfast', '--verbosity=2'])
+        
+        elif command == 'help':
+            print_help()
+        
+        else:
+            # Pass through to Django test runner
+            execute_from_command_line(['manage.py', 'test'] + sys.argv[1:])
+    
+    else:
+        print_help()
+
+
+def print_help():
+    """Print help message."""
+    help_text = """
+Usage: python run_tests.py [command]
+
+Commands:
+  all         Run all tests
+  cache       Run diagram cache tests only
+  render      Run rendering tests only
+  commands    Run management command tests only
+  coverage    Run tests with coverage report
+  fast        Run tests with fail-fast option
+  help        Show this help message
+
+Advanced:
+  You can also pass standard Django test arguments:
+    python run_tests.py <app_label>
+    python run_tests.py <app_label.TestCase>
+    python run_tests.py <app_label.TestCase.test_method>
+
+Examples:
+  python run_tests.py all
+  python run_tests.py cache
+  python run_tests.py coverage
+  python run_tests.py diagramm_proxy.test_diagram_cache.DiagramCacheTestCase
+  python run_tests.py abschnitte.tests.RenderTextabschnitteTestCase.test_render_diagram_success
+
+For more options, see Documentation/TESTING.md
+"""
+    print(help_text)
+
+
+if __name__ == '__main__':
+    main()