test some 400 error cases [test_error_cases]

Author: hjwp

test_api.py

@@ -64,3 +64,26 @@ def test_allocations_are_persisted(add_stock):
     r = requests.post(f"{url}/allocate", json=line2)
     assert r.status_code == 201
     assert r.json()["batchref"] == batch2
+
+
+@pytest.mark.usefixtures("restart_api")
+def test_400_message_for_out_of_stock(add_stock):
+    sku, smalL_batch, large_order = random_sku(), random_batchref(), random_orderid()
+    add_stock(
+        [(smalL_batch, sku, 10, "2011-01-01"),]
+    )
+    data = {"orderid": large_order, "sku": sku, "qty": 20}
+    url = config.get_api_url()
+    r = requests.post(f"{url}/allocate", json=data)
+    assert r.status_code == 400
+    assert r.json()["message"] == f"Out of stock for sku {sku}"
+
+
+@pytest.mark.usefixtures("restart_api")
+def test_400_message_for_invalid_sku():
+    unknown_sku, orderid = random_sku(), random_orderid()
+    data = {"orderid": orderid, "sku": unknown_sku, "qty": 20}
+    url = config.get_api_url()
+    r = requests.post(f"{url}/allocate", json=data)
+    assert r.status_code == 400
+    assert r.json()["message"] == f"Invalid sku {unknown_sku}"