package openidentity

import (
	"encoding/json"
	"strings"
	"testing"
)

func TestExternalUserJSONUsesSnakeCaseFields(t *testing.T) {
	payload, err := json.Marshal(ExternalUser{
		ExternalID:   "user:1",
		ExternalName: "test",
		SubjectID:    1,
	})
	if err != nil {
		t.Fatalf("marshal external user: %v", err)
	}

	text := string(payload)
	for _, field := range []string{`"external_id"`, `"external_name"`, `"subject_id"`} {
		if !strings.Contains(text, field) {
			t.Fatalf("expected %s in %s", field, text)
		}
	}
	for _, field := range []string{"externalId", "externalName", "subjectId"} {
		if strings.Contains(text, field) {
			t.Fatalf("unexpected camelCase field %q in %s", field, text)
		}
	}
}