✅ Add basic create order test

🎨 Add MutationTest helper to help write mutation tests with strawberry
➕ add pytest-django
⬆ Bump some python deps

main/tests/test_mutations.py

@@ -0,0 +1,50 @@
+import pytest
+from django.test import Client
+from strawberry.django.test import GraphQLTestClient
+
+from main.api.mutations import create_order
+from main.models import Product, Order
+from main.testing import MutationTest
+
+
+@pytest.fixture(name="gql_client")
+def gql_client_fixture(client: Client):
+    yield GraphQLTestClient(client)
+
+
+@pytest.fixture(name='product')
+def product_fix(db):
+    return Product.objects.create(name='borg', sale_price_ext=35, sale_price_int=30)
+
+
+@pytest.fixture(name='create_order_mutation')
+def create_order_mutation_fixture(product):
+    fields = """
+    ... on CreateOrderSuccess {
+      order {
+        id
+        orderSum
+        orderlines {
+          id
+          product {
+            id
+          }
+        }
+      }
+    }"""
+    # FIXME: maybe drop this helper and just use GraphQLTestClient
+    return MutationTest(create_order, fields)
+
+
+def test_create_order(product, create_order_mutation):
+    assert Order.objects.count() == 0
+    res = create_order_mutation.mutate(customerId="external", isExternal=True, orderLines=[{"productId": product.id, "amount": 1}])
+    assert res
+    assert not res.errors
+    assert res.data
+    order_lines = res.data.get('createOrder', {}).get('order', {}).get('orderlines', [])
+    assert order_lines
+    assert order_lines[0]['product']['id'] == str(product.id)
+    assert Order.objects.count() == 1
+    o = Order.objects.first()
+    assert o.orderlines.first().product.id == product.id