simple deallocate test

Author: hjwp

test_batches.py

@@ -34,3 +34,10 @@ def test_cannot_allocate_if_skus_do_not_match():
     batch = Batch("batch-001", "UNCOMFORTABLE-CHAIR", 100, eta=None)
     different_sku_line = OrderLine("order-123", "EXPENSIVE-TOASTER", 10)
     assert batch.can_allocate(different_sku_line) is False
+
+
+def test_deallocate():
+    batch, line = make_batch_and_line("EXPENSIVE-FOOTSTOOL", 20, 2)
+    batch.allocate(line)
+    batch.deallocate(line)
+    assert batch.available_quantity == 20