repro getkin#883

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

openapi3/issue883_test.go

@@ -0,0 +1,61 @@
+package openapi3_test
+
+import (
+	"testing"
+
+	"github.com/invopop/yaml"
+	"github.com/stretchr/testify/require"
+
+	"github.com/getkin/kin-openapi/openapi3"
+)
+
+func TestIssue883(t *testing.T) {
+	spec := `
+openapi: '3.0.0'
+info:
+  version: '1.0.0'
+  title: Swagger Petstore
+  license:
+    name: MIT
+servers:
+- url: http://petstore.swagger.io/v1
+paths: {}
+components:
+  schemas:
+    Kitten:
+      type: string
+`[1:]
+
+	sl := openapi3.NewLoader()
+	doc, err := sl.LoadFromData([]byte(spec))
+	require.NoError(t, err)
+	require.NotNil(t, doc.Paths)
+
+	err = doc.Validate(sl.Context)
+	require.NoError(t, err)
+	require.NotNil(t, doc.Paths)
+
+	marshalledJson, err := doc.MarshalJSON()
+	require.NoError(t, err)
+	require.JSONEq(t, `{
+  "openapi": "3.0.0",
+  "info": {
+    "version": "1.0.0",
+    "title": "Swagger Petstore",
+    "license": {"name": "MIT"}
+  },
+  "servers": [{"url": "http://petstore.swagger.io/v1"}],
+  "paths": {},
+  "components": {
+    "schemas": {
+      "Kitten": {"type": "string"}
+    }
+  }
+}`, string(marshalledJson))
+	require.NotNil(t, doc.Paths)
+
+	marshalledYaml, err := yaml.Marshal(&doc)
+	require.NoError(t, err)
+	require.YAMLEq(t, spec, string(marshalledYaml))
+	require.NotNil(t, doc.Paths)
+}