Added tests for global id.

graphene/relay/tests/test_global_id.py

@@ -0,0 +1,22 @@
+from ..node import Node, GlobalID
+
+from ...types import NonNull, ID
+
+
+class CustomNode(Node):
+
+    class Meta:
+        name = 'Node'
+
+
+def test_global_id_defaults_to_required_and_node():
+    gid = GlobalID()
+    assert isinstance(gid.type, NonNull)
+    assert gid.type.of_type == ID
+    assert gid.node == Node
+
+
+def test_global_id_allows_overriding_of_node_and_required():
+    gid = GlobalID(node=CustomNode, required=False)
+    assert gid.type == ID
+    assert gid.node == CustomNode