Add tests to DataLoaderField

graphene_django/tests/test_fields.py

@@ -1,15 +1,26 @@
+from mock import mock
 from unittest import TestCase
 from django.core.exceptions import PermissionDenied
-from graphene_django.fields import DjangoField
+from graphene_django.fields import DjangoField, DataLoaderField
+from promise.dataloader import DataLoader
+from promise import Promise
 
 
 class MyInstance(object):
     value = "value"
+    key = 1
 
     def resolver(self):
         return "resolver method"
 
 
+def batch_load_fn(keys):
+    return Promise.all(keys)
+
+
+data_loader = DataLoader(batch_load_fn=batch_load_fn)
+
+
 class PermissionFieldTests(TestCase):
 
     def test_permission_field(self):
@@ -21,12 +32,9 @@ class PermissionFieldTests(TestCase):
             def has_perm(self, perm):
                 return perm == 'perm2'
 
-        class Info(object):
-            class Context(object):
-                user = Viewer()
-            context = Context()
+        info = mock.Mock(context=mock.Mock(user=Viewer()))
 
-        self.assertEqual(resolver(MyInstance(), Info()), MyInstance().resolver())
+        self.assertEqual(resolver(MyInstance(), info), MyInstance().resolver())
 
     def test_permission_field_without_permission(self):
         MyType = object()
@@ -37,10 +45,51 @@ class PermissionFieldTests(TestCase):
             def has_perm(self, perm):
                 return False
 
-        class Info(object):
-            class Context(object):
-                user = Viewer()
-            context = Context()
+        info = mock.Mock(context=mock.Mock(user=Viewer()))
 
         with self.assertRaises(PermissionDenied):
-            resolver(MyInstance(), Info())
+            resolver(MyInstance(), info)
+
+
+class DataLoaderFieldTests(TestCase):
+
+    def test_dataloaderfield(self):
+        MyType = object()
+        data_loader_field = DataLoaderField(data_loader=data_loader, source_loader='key', type=MyType)
+
+        resolver = data_loader_field.get_resolver(None)
+        instance = MyInstance()
+
+        self.assertEqual(resolver(instance, None).get(), instance.key)
+
+    def test_dataloaderfield_permissions(self):
+        MyType = object()
+        data_loader_field = DataLoaderField(data_loader=data_loader, source_loader='key', type=MyType,
+                                            permissions=['perm1', 'perm2'])
+
+        resolver = data_loader_field.get_resolver(None)
+        instance = MyInstance()
+
+        class Viewer(object):
+            def has_perm(self, perm):
+                return perm == 'perm2'
+
+        info = mock.Mock(context=mock.Mock(user=Viewer()))
+
+        self.assertEqual(resolver(instance, info).get(), instance.key)
+
+    def test_dataloaderfield_without_permissions(self):
+        MyType = object()
+        data_loader_field = DataLoaderField(data_loader=data_loader, source_loader='key', type=MyType,
+                                            permissions=['perm1', 'perm2'])
+
+        resolver = data_loader_field.get_resolver(None)
+        instance = MyInstance()
+
+        class Viewer(object):
+            def has_perm(self, perm):
+                return False
+
+        info = mock.Mock(context=mock.Mock(user=Viewer()))
+        with self.assertRaises(PermissionDenied):
+            resolver(instance, info)