Added schema str representation

Author: syrusakbary

graphene/core/schema.py

@@ -6,6 +6,7 @@
     SynchronousExecutionMiddleware
 from graphql.core.type import GraphQLSchema as _GraphQLSchema
 from graphql.core.utils.introspection_query import introspection_query
+from graphql.core.utils.schema_printer import print_schema
 
 from graphene import signals
 
@@ -89,6 +90,9 @@ def objecttype(self, type):
                     objecttype) and issubclass(objecttype, BaseObjectType):
                 return objecttype
 
+    def __str__(self):
+        return print_schema(self.schema)
+
     def setup(self):
         assert self.query, 'The base query type is not set'
         self.T(self.query)

graphene/core/tests/test_schema.py

@@ -152,3 +152,22 @@ class MyType(ObjectType):
     schema.query = MyType
 
     assert schema.T(t) == schema.T(MyType)
+
+
+def test_schema_str():
+    expected = """
+interface Character {
+  name: String
+}
+
+type Human implements Character {
+  name: String
+  friends: [Character]
+  pet: Pet
+}
+
+type Pet {
+  type: String
+}
+""".lstrip()
+    assert str(schema) == expected