Add some unit tests for the new functions

InvenTree/stock/tests.py

@@ -335,6 +335,35 @@ class StockTest(TestCase):
         # Serialize the remainder of the stock
         item.serializeStock(2, [99, 100], self.user)
 
+    def test_installation(self):
+        """
+        Test that the functions to install stock items in other stock items work.
+        """
+
+        item_1 = StockItem.objects.get(pk=1)
+        item_2 = StockItem.objects.get(pk=2)
+
+        self.assertEqual(item_1.belongs_to, None)
+        self.assertFalse(item_2.hasInstalledItems())
+        
+        n = item_1.tracking_info_count
+
+        # Now, let's install item_1 into item_2
+        item_1.installIntoStockItem(item_2, self.user, "Hello world!")
+
+        # Check that it installed properly!
+        self.assertEqual(item_1.tracking_info_count, n + 1)
+        self.assertTrue(item_2.hasInstalledItems())
+        self.assertEqual(item_1.belongs_to, item_2)
+
+        # Now, let's uninstall it!
+        item_1.uninstallIntoLocation(item_1.location, self.user, "Wello horld!")
+
+        # Check that it uninstalled
+        self.assertEqual(item_1.tracking_info_count, n + 2)
+        self.assertFalse(item_2.hasInstalledItems())
+        self.assertEqual(item_1.belongs_to, None)
+        
 
 class VariantTest(StockTest):
     """