func schemaDiff(a, b *spec.Schema) string {
	// This option construct allows diffing all fields, even unexported ones.
	return cmp.Diff(a, b, cmp.Exporter(func(reflect.Type) bool { return true }))
}

func TestBuildOpenAPIV2(t *testing.T) {
	tests := []struct {
		name                  string
		schema                string
		preserveUnknownFields *bool
		wantedSchema          string
		opts                  Options