make form required field order deterministic (#1008)

Author: jlsherrill

openapi2conv/issue1008_test.go

@@ -0,0 +1,49 @@
+package openapi2conv
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestIssue1008(t *testing.T) {
+	v2 := []byte(`
+swagger: '2.0'
+info:
+  version: '1.10'
+  title: title
+paths:
+  "/ping":
+    post:
+      consumes:
+      - multipart/form-data
+      parameters:
+      - name: zebra
+        in: formData
+        description: stripes
+        required: true
+        type: string
+      - name: alpaca
+        in: formData
+        description: chewy
+        required: true
+        type: string
+      - name: bee
+        in: formData
+        description: buzz
+        required: true
+        type: string
+      responses:
+        '200':
+          description: OK
+`)
+
+	v3, err := v2v3YAML(v2)
+	require.NoError(t, err)
+
+	err = v3.Validate(context.Background())
+	require.NoError(t, err)
+	assert.Equal(t, []string{"alpaca", "bee", "zebra"}, v3.Paths.Value("/ping").Post.RequestBody.Value.Content.Get("multipart/form-data").Schema.Value.Required)
+}

openapi2conv/openapi2_conv.go

@@ -346,6 +346,7 @@ func formDataBody(bodies map[string]*openapi3.SchemaRef, reqs map[string]bool, c
 			bodies[s] = ref
 		}
 	}
+	sort.Strings(requireds)
 	schema := &openapi3.Schema{
 		Type:       &openapi3.Types{"object"},
 		Properties: ToV3Schemas(bodies),