better coverage for part/models

- Increase from 57% to 67%

InvenTree/part/test_category.py

@@ -64,3 +64,13 @@ class CategoryTest(TestCase):
         self.assertEqual(self.p1.partcount, 3)
         self.assertEqual(self.p2.partcount, 3)
         self.assertEqual(self.p3.partcount, 1)
+
+    def test_delete(self):
+        self.assertEqual(Part.objects.filter(category=self.p1).count(), 0)
+
+        # Delete p2 (it has 2 direct parts and one child category)
+        self.p2.delete()
+
+        self.assertEqual(Part.objects.filter(category=self.p1).count(), 2)
+        
+        self.assertEqual(PartCategory.objects.get(pk=self.p3.id).parent, self.p1)

InvenTree/part/test_part.py

@@ -1,6 +1,9 @@
 from django.test import TestCase
 
+import os
+
 from .models import Part, PartCategory
+from .models import rename_part_image
 
 
 class SimplePartTest(TestCase):
@@ -21,3 +24,15 @@ class SimplePartTest(TestCase):
     def test_category(self):
         self.assertEqual(self.px.category_path, '')
         self.assertEqual(self.pz.category_path, 'TLC')
+
+    def test_rename_img(self):
+        img = rename_part_image(self.px, 'hello.png')
+        self.assertEqual(img, os.path.join('part_images', 'part_1_img.png'))
+
+        img = rename_part_image(self.pz, 'test')
+        self.assertEqual(img, os.path.join('part_images', 'part_3_img'))
+
+    def test_stock(self):
+        # Stock should initially be zero
+        self.assertEqual(self.px.total_stock, 0)
+        self.assertEqual(self.py.available_stock, 0)