fix(graphql-error) unicode error message

Author: Romulo Furtado

graphql/error/located_error.py

@@ -9,12 +9,10 @@ class GraphQLLocatedError(GraphQLError):
 
     def __init__(self, nodes, original_error=None):
         if original_error:
-            message = (
-                original_error.message.encode('utf-8')
-                if isinstance(original_error.message, unicode)
-                else str(original_error)
-            )
-
+            try:
+                message = str(original_error)
+            except UnicodeEncodeError:
+                message = original_error.message.encode('utf-8')
         else:
             message = 'An unknown error occurred.'
 

graphql/execution/tests/test_located_error.py

@@ -0,0 +1,23 @@
+# coding: utf-8
+
+from graphql import GraphQLField
+from graphql import GraphQLObjectType
+from graphql import GraphQLSchema
+from graphql import GraphQLString
+from graphql import execute
+from graphql import parse
+from graphql.error import GraphQLLocatedError
+
+
+def test_unicode_error_message():
+    ast = parse('query Example { unicode }')
+
+    def resolver(context, *_):
+        raise Exception(u'UNIÇODÉ!')
+
+    Type = GraphQLObjectType('Type', {
+        'unicode': GraphQLField(GraphQLString, resolver=resolver),
+    })
+
+    result = execute(GraphQLSchema(Type), ast)
+    assert isinstance(result.errors[0], GraphQLLocatedError)