try reproducing getkin#447

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

openapi3/loader_recursive_ref_test.go

@@ -11,7 +11,39 @@ func TestLoaderSupportsRecursiveReference(t *testing.T) {
 	loader.IsExternalRefsAllowed = true
 	doc, err := loader.LoadFromFile("testdata/recursiveRef/openapi.yml")
 	require.NoError(t, err)
-	require.NotNil(t, doc)
-	require.NoError(t, doc.Validate(loader.Context))
+	err = doc.Validate(loader.Context)
+	require.NoError(t, err)
 	require.Equal(t, "bar", doc.Paths["/foo"].Get.Responses.Get(200).Value.Content.Get("application/json").Schema.Value.Properties["foo2"].Value.Properties["foo"].Value.Properties["bar"].Value.Example)
 }
+
+func TestIssue447(t *testing.T) {
+	loader := NewLoader()
+	doc, err := loader.LoadFromData([]byte(`
+openapi: 3.0.1
+info:
+  title: Recursive refs example
+  version: "1.0"
+paths: {}
+components:
+  schemas:
+    Complex:
+      type: object
+      properties:
+        parent:
+          $ref: '#/components/schemas/Complex'
+`))
+	require.NoError(t, err)
+	err = doc.Validate(loader.Context)
+	require.NoError(t, err)
+	require.Equal(t, "object", doc.Components.
+		// Complex
+		Schemas["Complex"].
+		// parent
+		Value.Properties["parent"].
+		// parent
+		Value.Properties["parent"].
+		// parent
+		Value.Properties["parent"].
+		// type
+		Value.Type)
+}