From ee46d8c7bed7528a847fc2bdf4ce4ff2b50f6c54 Mon Sep 17 00:00:00 2001
From: Syrus Akbary <me@syrusakbary.com>
Date: Wed, 15 Jun 2016 21:16:31 -0700
Subject: [PATCH] Improved Scalars tests

---
 graphene/types/tests/test_scalars.py | 88 +++++++++++++++++++++++++++-
 1 file changed, 85 insertions(+), 3 deletions(-)

diff --git a/graphene/types/tests/test_scalars.py b/graphene/types/tests/test_scalars.py
index e97365cb..20b1b0eb 100644
--- a/graphene/types/tests/test_scalars.py
+++ b/graphene/types/tests/test_scalars.py
@@ -1,21 +1,65 @@
+import datetime
 import pytest
 
 from graphene.utils.get_graphql_type import get_graphql_type
-from graphql import GraphQLBoolean, GraphQLFloat, GraphQLInt, GraphQLString
+from graphql import GraphQLBoolean, GraphQLFloat, GraphQLInt, GraphQLString, GraphQLScalarType, graphql
+from graphql.language import ast
 
 from ..field import Field
 from ..objecttype import ObjectType
 from ..scalars import Boolean, Float, Int, Scalar, String
+from ..schema import Schema
 
 
 class DatetimeScalar(Scalar):
+    class Meta:
+        name = 'DateTime'
 
-    def serialize(value):
-        return value.isoformat()
+    @staticmethod
+    def serialize(dt):
+        assert isinstance(dt, datetime.datetime)
+        return dt.isoformat()
+
+    @staticmethod
+    def parse_literal(node):
+        if isinstance(node, ast.StringValue):
+            return datetime.datetime.strptime(node.value, "%Y-%m-%dT%H:%M:%S.%f")
+
+    @staticmethod
+    def parse_value(value):
+        return datetime.datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%f")
+
+
+def serialize_date_time(dt):
+    assert isinstance(dt, datetime.datetime)
+    return dt.isoformat()
+
+
+def parse_literal(node):
+    if isinstance(node, ast.StringValue):
+        return datetime.datetime.strptime(node.value, "%Y-%m-%dT%H:%M:%S.%f")
+
+
+def parse_value(value):
+    return datetime.datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%f")
+
+
+GraphQLDateTimeType = GraphQLScalarType(
+    name='DateTime',
+    serialize=serialize_date_time,
+    parse_literal=parse_literal,
+    parse_value=parse_value
+)
+
+
+class DatetimeScalarGraphQL(Scalar):
+    class Meta:
+        graphql_type = GraphQLDateTimeType
 
 
 scalar_classes = {
     DatetimeScalar: DatetimeScalar._meta.graphql_type,
+    DatetimeScalarGraphQL: GraphQLDateTimeType,
     String: GraphQLString,
     Int: GraphQLInt,
     Float: GraphQLFloat,
@@ -55,3 +99,41 @@ def test_custom_scalar_empty():
             pass
 
     assert """DatetimeScalar must provide "serialize" function.""" in str(excinfo.value)
+
+
+@pytest.mark.parametrize("scalar_class", (DatetimeScalar, DatetimeScalarGraphQL))
+def test_custom_scalar_empty(scalar_class):
+    class Query(ObjectType):
+        datetime = scalar_class(_in=scalar_class(name='in'))
+
+        def resolve_datetime(self, args, context, info):
+            return args.get('in')
+
+    now = datetime.datetime.now()
+    isoformat = now.isoformat()
+
+    schema = Schema(query=Query)
+
+    response = graphql(schema, '''
+        {
+            datetime(in: "%s")
+        }
+    ''' % isoformat)
+
+    assert not response.errors
+    assert response.data == {
+        'datetime': isoformat
+    }
+
+    response = graphql(schema, '''
+        query Test($date: DateTime) {
+            datetime(in: $date)
+        }
+    ''', variable_values={
+        'date': isoformat
+    })
+
+    assert not response.errors
+    assert response.data == {
+        'datetime': isoformat
+    }