reproduce issue getkin#423

Signed-off-by: Pierre Fenoll <pierrefenoll@gmail.com>

openapi3/loader_outside_refs_test.go

@@ -18,3 +18,34 @@ func TestLoadOutsideRefs(t *testing.T) {
 
 	require.Equal(t, "string", doc.Paths["/service"].Get.Responses["200"].Value.Content["application/json"].Schema.Value.Items.Value.AllOf[0].Value.Properties["created_at"].Value.Type)
 }
+
+func TestIssue423(t *testing.T) {
+	spec := `
+info:
+  description: test
+  title: test
+  version: 0.0.0
+openapi: 3.0.1
+paths:
+  /api/bundles:
+    get:
+      responses:
+        "200":
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Data'
+components:
+  schemas:
+    Data:
+      description: rbac Data
+      properties:
+        roles:
+           $ref: "https://raw.githubusercontent.com/kubernetes/kubernetes/master/api/openapi-spec/swagger.json#/definitions/io.k8s.api.rbac.v1.RoleList"
+`
+
+	loader := NewLoader()
+	loader.IsExternalRefsAllowed = true
+	loader.LoadFromData([]byte(spec))
+}