feat: initialize default root user

backend/internal/initdb/user_test.go

@@ -0,0 +1,52 @@
+package initdb
+
+import (
+	"testing"
+
+	"github.com/glebarez/sqlite"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
+	"senlinai-agent/backend/internal/models"
+)
+
+func TestInitUserCreatesRootUserWhenTableIsEmpty(t *testing.T) {
+	database := newUserTestDatabase(t)
+
+	require.NoError(t, InitUser(database))
+
+	var users []models.SenlinAgentUser
+	require.NoError(t, database.Find(&users).Error)
+	require.Len(t, users, 1)
+	require.Equal(t, rootUsername, users[0].Email)
+	require.Equal(t, rootUsername, users[0].DisplayName)
+	require.Equal(t, rootRole, users[0].Role)
+	require.NoError(t, bcrypt.CompareHashAndPassword([]byte(users[0].PasswordHash), []byte(rootPassword)))
+}
+
+func TestInitUserDoesNothingWhenTableIsNotEmpty(t *testing.T) {
+	database := newUserTestDatabase(t)
+	existing := models.SenlinAgentUser{
+		Email:        "existing@example.com",
+		DisplayName:  "Existing User",
+		PasswordHash: "existing-hash",
+		Role:         "user",
+	}
+	require.NoError(t, database.Create(&existing).Error)
+
+	require.NoError(t, InitUser(database))
+
+	var users []models.SenlinAgentUser
+	require.NoError(t, database.Find(&users).Error)
+	require.Len(t, users, 1)
+	require.Equal(t, existing.Email, users[0].Email)
+}
+
+func newUserTestDatabase(t *testing.T) *gorm.DB {
+	t.Helper()
+
+	database, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	require.NoError(t, err)
+	require.NoError(t, database.AutoMigrate(&models.SenlinAgentUser{}))
+	return database
+}