Make utils module a package

Following the same directory structure as the JavaScript version.

Author: Cito

src/graphql_relay/connection/arrayconnection.py

@@ -1,6 +1,6 @@
 import binascii
 
-from ..utils import base64, unbase64
+from ..utils.base64 import base64, unbase64
 from .connectiontypes import Connection, PageInfo, Edge
 
 

src/graphql_relay/node/node.py

@@ -1,4 +1,4 @@
-from graphql_relay.utils import base64, unbase64
+from graphql_relay.utils.base64 import base64, unbase64
 
 from graphql.type import (
     GraphQLArgument,

src/graphql_relay/utils.py

@@ -0,0 +1,6 @@
+"""graphql_relay.utils"""
+
+
+def resolve_maybe_thunk(f):  # TODO: do we need that?
+    return f() if callable(f) else f
+

src/graphql_relay/utils/__init__.py

@@ -0,0 +1,13 @@
+from base64 import b64encode, b64decode
+
+__all__ = ['base64', 'unbase64']
+
+
+def base64(s: str) -> str:
+    """"Encode the string s using Base64."""
+    return b64encode(s.encode('utf-8')).decode('utf-8')
+
+
+def unbase64(s: str) -> str:
+    """"Decode the string s using Base64."""
+    return b64decode(s).decode('utf-8')

src/graphql_relay/utils/base64.py

@@ -0,0 +1 @@
+"""Tests for graphql_relay.utils"""

tests/test_utils.py

@@ -0,0 +1,15 @@
+import base64
+
+from graphql_relay.utils.base64 import base64, unbase64
+
+
+example_unicode = 'Some examples: ❤😀'
+example_base64 = 'U29tZSBleGFtcGxlczog4p2k8J+YgA=='
+
+
+def test_converts_from_unicode_to_base64():
+    assert base64(example_unicode) == example_base64
+
+
+def test_converts_from_base_64_to_unicode():
+    assert unbase64(example_base64) == example_unicode