Added query, mutate and execute method to dsl

gql/dsl.py

@@ -23,6 +23,15 @@ def __getattr__(self, name):
         type_def = self.schema.get_type(name)
         return DSLType(type_def)
 
+    def query(self, *args, **kwargs):
+        return self.execute(query(*args, **kwargs))
+
+    def mutate(self, *args, **kwargs):
+        return self.query(*args, operation='mutate', **kwargs)
+
+    def execute(self, document):
+        return self.client.execute(document)
+
 
 class DSLType(object):
     def __init__(self, type):

tests/starwars/test_dsl.py

@@ -277,3 +277,18 @@ def test_fetch_luke_aliased(ds):
 #     result = schema.execute(query)
 #     assert not result.errors
 #     assert result.data == expected
+
+
+
+def test_hero_name_query(ds):
+    result = ds.query(
+        ds.Query.hero.select(
+            ds.Character.name
+        )
+    )
+    expected = {
+        'hero': {
+            'name': 'R2-D2'
+        }
+    }
+    assert result == expected