Initial commit: Django inventory system

myproject/test_cycles.py

@@ -0,0 +1,134 @@
+"""
+Test script for category cycle protection
+"""
+import os
+import django
+
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'myproject.settings')
+django.setup()
+
+from products.models import ProductCategory
+from django.core.exceptions import ValidationError
+
+
+print("="*60)
+print("TEST 1: Self-reference (A.parent = A)")
+print("="*60)
+try:
+    cat = ProductCategory.objects.first()
+    print(f"Category: {cat.name} (id={cat.pk})")
+    cat.parent = cat
+    cat.save()
+    print("[FAIL] Self-reference was NOT blocked!")
+except ValidationError as e:
+    print("[PASS] Self-reference blocked successfully")
+    print(f"Error: {e.message_dict.get('parent')}")
+
+print("\n" + "="*60)
+print("TEST 2: Simple cycle (A -> B -> A)")
+print("="*60)
+try:
+    cats = list(ProductCategory.objects.all()[:2])
+    cat_a, cat_b = cats[0], cats[1]
+    print(f"Category A: {cat_a.name} (id={cat_a.pk})")
+    print(f"Category B: {cat_b.name} (id={cat_b.pk})")
+
+    # Create A -> B
+    cat_a.parent = None
+    cat_a.save()
+    cat_b.parent = cat_a
+    cat_b.save()
+    print(f"Created: {cat_a.name} -> {cat_b.name}")
+
+    # Try to create cycle: A.parent = B
+    cat_a.parent = cat_b
+    cat_a.save()
+    print("[FAIL] Cycle was NOT blocked!")
+
+    # Cleanup
+    cat_a.parent = None
+    cat_b.parent = None
+    cat_a.save()
+    cat_b.save()
+
+except ValidationError as e:
+    print("[PASS] Cycle blocked successfully")
+    print(f"Error: {e.message_dict.get('parent')}")
+    # Cleanup
+    cat_a.parent = None
+    cat_b.parent = None
+    cat_a.save()
+    cat_b.save()
+
+print("\n" + "="*60)
+print("TEST 3: Multi-level cycle (A -> B -> C -> A)")
+print("="*60)
+try:
+    cats = list(ProductCategory.objects.all()[:3])
+    cat_a, cat_b, cat_c = cats[0], cats[1], cats[2]
+    print(f"Category A: {cat_a.name} (id={cat_a.pk})")
+    print(f"Category B: {cat_b.name} (id={cat_b.pk})")
+    print(f"Category C: {cat_c.name} (id={cat_c.pk})")
+
+    # Create chain A -> B -> C
+    cat_a.parent = None
+    cat_a.save()
+    cat_b.parent = cat_a
+    cat_b.save()
+    cat_c.parent = cat_b
+    cat_c.save()
+    print(f"Created: {cat_a.name} -> {cat_b.name} -> {cat_c.name}")
+
+    # Try to create cycle: A.parent = C
+    cat_a.parent = cat_c
+    cat_a.save()
+    print("[FAIL] Multi-level cycle was NOT blocked!")
+
+    # Cleanup
+    cat_a.parent = None
+    cat_b.parent = None
+    cat_c.parent = None
+    cat_a.save()
+    cat_b.save()
+    cat_c.save()
+
+except ValidationError as e:
+    print("[PASS] Multi-level cycle blocked successfully")
+    print(f"Error: {e.message_dict.get('parent')}")
+    # Cleanup
+    cat_a.parent = None
+    cat_b.parent = None
+    cat_c.parent = None
+    cat_a.save()
+    cat_b.save()
+    cat_c.save()
+
+print("\n" + "="*60)
+print("TEST 4: Normal operations should work")
+print("="*60)
+try:
+    cats = list(ProductCategory.objects.all()[:2])
+    cat_a, cat_b = cats[0], cats[1]
+
+    # Reset
+    cat_a.parent = None
+    cat_b.parent = None
+    cat_a.save()
+    cat_b.save()
+
+    # Create normal hierarchy A -> B
+    cat_b.parent = cat_a
+    cat_b.save()
+    print(f"[PASS] Normal hierarchy created: {cat_a.name} -> {cat_b.name}")
+
+    # Cleanup
+    cat_b.parent = None
+    cat_b.save()
+
+except ValidationError as e:
+    print("[FAIL] Normal operation was blocked!")
+    print(f"Error: {e}")
+
+print("\n" + "="*60)
+print("ALL TESTS COMPLETED")
+print("="*60)