summercms/modules/lagoon/backend_admin_migrations_test.go

package lagoon

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"git.golem15.com/golem15/summercms/modules/party"
	"github.com/go-gormigrate/gormigrate/v2"
	"gorm.io/gorm"
)

func TestPhase09MigrationsFreshRollback(t *testing.T) {
	assertNoAutoMigrate(t)
	db, _ := dedicatedDB(t, "phase09_fresh")
	gdb, err := Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	plugin := migPlugin{
		id: "demo.keep",
		migrations: []*gormigrate.Migration{{
			ID: "202609240010_keep",
			Migrate: func(tx *gorm.DB) error {
				return tx.Exec(`CREATE TABLE phase09_keep (id BIGSERIAL PRIMARY KEY)`).Error
			},
			Rollback: func(tx *gorm.DB) error {
				return tx.Exec(`DROP TABLE IF EXISTS phase09_keep`).Error
			},
		}},
	}
	if err := Migrate(gdb, []party.Plugin{plugin}); err != nil {
		t.Fatal(err)
	}
	if !gdb.Migrator().HasTable("system_files") || !gdb.Migrator().HasTable("backend_users") || !gdb.Migrator().HasTable("phase09_keep") {
		t.Fatal("fresh migrate did not keep framework, admin, and plugin tables together")
	}
	before := systemRoles(t, gdb)
	if len(before) != 2 {
		t.Fatalf("seeded roles = %v", before)
	}
	if err := Migrate(gdb, []party.Plugin{plugin}); err != nil {
		t.Fatalf("repeated migrate: %v", err)
	}
	if after := systemRoles(t, gdb); len(after) != 2 || after["developer"].id != before["developer"].id || after["publisher"].id != before["publisher"].id {
		t.Fatalf("roles changed on repeat: before=%v after=%v", before, after)
	}
	admin, err := migrator(gdb, "summercms.cabana", BackendAdminMigrations)
	if err != nil {
		t.Fatal(err)
	}
	rollbackBackendAdmin(t, admin)
	for _, name := range []string{"backend_users", "backend_user_roles", "backend_jwt_blacklist"} {
		if gdb.Migrator().HasTable(name) {
			t.Fatalf("%s survived admin rollback", name)
		}
	}
	if !gdb.Migrator().HasTable("system_files") || !gdb.Migrator().HasTable("phase09_keep") {
		t.Fatal("admin rollback removed a framework or plugin table")
	}
	var attachIDs, pluginIDs []string
	if err := gdb.Table("summer_migrations_summercms_attach").Pluck("id", &attachIDs).Error; err != nil {
		t.Fatal(err)
	}
	if err := gdb.Table("summer_migrations_demo_keep").Pluck("id", &pluginIDs).Error; err != nil {
		t.Fatal(err)
	}
	if strings.Join(attachIDs, ",") == "" || strings.Join(pluginIDs, ",") != "202609240010_keep" {
		t.Fatalf("histories attach=%v plugin=%v", attachIDs, pluginIDs)
	}
	if err := Migrate(gdb, []party.Plugin{plugin}); err != nil {
		t.Fatalf("migrate after rollback: %v", err)
	}
	if !gdb.Migrator().HasTable("backend_users") {
		t.Fatal("admin tables were not recreated")
	}
	if again := systemRoles(t, gdb); len(again) != 2 {
		t.Fatalf("roles after recreate = %v", again)
	}
}

func TestBackendAdminMigration(t *testing.T) {
	assertNoAutoMigrate(t)
	db, _ := dedicatedDB(t, "lagoon_admin_mig")
	gdb, err := Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatal(err)
	}
	if !gdb.Migrator().HasTable("system_files") {
		t.Fatal("framework attachment migration must still run before backend admin tables")
	}
	users := columnNullability(t, gdb, "backend_users")
	wantUsers := map[string]bool{
		"id": false, "first_name": true, "last_name": true, "login": false, "email": false,
		"password": false, "activation_code": true, "persist_code": true, "reset_password_code": true,
		"permissions": true, "is_activated": false, "is_superuser": false, "role_id": true,
		"activated_at": true, "last_login": true, "created_at": false, "updated_at": false,
		"deleted_at": true, "tokens_valid_after": true, "metadata": true,
	}
	assertColumns(t, "backend_users", users, wantUsers)
	roles := columnNullability(t, gdb, "backend_user_roles")
	wantRoles := map[string]bool{
		"id": false, "name": false, "code": true, "description": true, "permissions": true,
		"is_system": false, "created_at": false, "updated_at": false,
	}
	assertColumns(t, "backend_user_roles", roles, wantRoles)
	bl := columnNullability(t, gdb, "backend_jwt_blacklist")
	assertColumns(t, "backend_jwt_blacklist", bl, map[string]bool{
		"jti": false, "expires_at": false, "valid_until": false,
	})
	for _, name := range []string{"backend_user_groups", "backend_users_groups", "backend_user_preferences", "backend_access_log"} {
		if gdb.Migrator().HasTable(name) {
			t.Fatalf("prohibited table %s exists", name)
		}
	}
	for _, col := range []string{"activation_code", "reset_password_code", "role_id", "deleted_at", "login", "email"} {
		if !indexOn(indexDefs(t, gdb, "backend_users"), col) {
			t.Fatalf("backend_users missing index on %s", col)
		}
	}
	if !indexOn(indexDefs(t, gdb, "backend_user_roles"), "code") {
		t.Fatal("backend_user_roles missing index on code")
	}
	var fk string
	if err := gdb.Raw(`SELECT pg_get_constraintdef(oid) FROM pg_constraint WHERE conrelid = 'backend_users'::regclass AND contype = 'f'`).Scan(&fk).Error; err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(fk, "backend_user_roles") {
		t.Fatalf("role relationship = %q", fk)
	}
	if err := gdb.Exec(`INSERT INTO backend_users (login, email, password, created_at, updated_at) VALUES ('ada', 'ada@example.test', 'x', NOW(), NOW())`).Error; err != nil {
		t.Fatal(err)
	}
	if err := gdb.Exec(`INSERT INTO backend_users (login, email, password, created_at, updated_at) VALUES ('ada', 'other@example.test', 'x', NOW(), NOW())`).Error; err == nil {
		t.Fatal("duplicate login was accepted")
	}
	if err := gdb.Exec(`INSERT INTO backend_users (login, email, password, created_at, updated_at) VALUES ('ada-2', 'ada@example.test', 'x', NOW(), NOW())`).Error; err == nil {
		t.Fatal("duplicate email was accepted")
	}
}

func TestBackendAdminSeed(t *testing.T) {
	db, _ := dedicatedDB(t, "lagoon_admin_seed")
	gdb, err := Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatalf("repeated migrate: %v", err)
	}
	before := systemRoles(t, gdb)
	if err := gdb.Exec(`DELETE FROM summer_migrations_summercms_cabana`).Error; err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatalf("reapplying the admin migration must leave the developer and publisher seeds idempotent: %v", err)
	}
	after := systemRoles(t, gdb)
	if len(before) != 2 || len(after) != 2 {
		t.Fatalf("roles before=%v after=%v", before, after)
	}
	for code, row := range before {
		next, ok := after[code]
		if !ok || next.id != row.id || !next.system {
			t.Fatalf("role %s changed: before=%+v after=%+v", code, row, next)
		}
	}
}

func TestBackendAdminRollback(t *testing.T) {
	db, _ := dedicatedDB(t, "lagoon_admin_rollback")
	gdb, err := Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	plugin := migPlugin{
		id: "demo.keep",
		migrations: []*gormigrate.Migration{{
			ID: "202609240010_keep",
			Migrate: func(tx *gorm.DB) error {
				return tx.Exec(`CREATE TABLE lagoon_keep (id BIGSERIAL PRIMARY KEY)`).Error
			},
			Rollback: func(tx *gorm.DB) error {
				return tx.Exec(`DROP TABLE IF EXISTS lagoon_keep`).Error
			},
		}},
	}
	if err := Migrate(gdb, []party.Plugin{plugin}); err != nil {
		t.Fatal(err)
	}
	if !gdb.Migrator().HasTable("backend_jwt_blacklist") {
		t.Fatal("blacklist table missing before rollback")
	}
	m, err := migrator(gdb, "summercms.cabana", BackendAdminMigrations)
	if err != nil {
		t.Fatal(err)
	}
	rollbackBackendAdmin(t, m)
	for _, name := range []string{"backend_users", "backend_user_roles", "backend_jwt_blacklist"} {
		if gdb.Migrator().HasTable(name) {
			t.Fatalf("%s survived admin rollback", name)
		}
	}
	if !gdb.Migrator().HasTable("system_files") || !gdb.Migrator().HasTable("lagoon_keep") {
		t.Fatal("admin rollback removed another framework or plugin table")
	}
	var attachIDs, pluginIDs []string
	if err := gdb.Table("summer_migrations_summercms_attach").Pluck("id", &attachIDs).Error; err != nil {
		t.Fatal(err)
	}
	if err := gdb.Table("summer_migrations_demo_keep").Pluck("id", &pluginIDs).Error; err != nil {
		t.Fatal(err)
	}
	if strings.Join(attachIDs, ",") != "202609180001_create_system_files" {
		t.Fatalf("attach history = %v", attachIDs)
	}
	if strings.Join(pluginIDs, ",") != "202609240010_keep" {
		t.Fatalf("plugin history = %v", pluginIDs)
	}
}

func TestBackendAdminWinterRow(t *testing.T) {
	db, _ := dedicatedDB(t, "lagoon_admin_winter")
	gdb, err := Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatal(err)
	}
	var role winterRole
	if err := gdb.Where("code = ?", "developer").First(&role).Error; err != nil {
		t.Fatal(err)
	}
	if role.Name != "Developer" || !role.IsSystem {
		t.Fatalf("developer role = %+v", role)
	}
	if err := gdb.Exec(`INSERT INTO backend_users
		(first_name, last_name, login, email, password, activation_code, persist_code, reset_password_code, permissions, is_activated, is_superuser, role_id, activated_at, last_login, created_at, updated_at)
		VALUES ('Ada', 'Lovelace', 'ada', 'Ada@Example.Test', 'winter-hash', 'act', 'persist', 'reset', '{"backend.manage_access":1}', TRUE, FALSE, NULL, NULL, NULL, NOW(), NOW())`).Error; err != nil {
		t.Fatal(err)
	}
	var user winterUser
	if err := gdb.Preload("Role").Where("login = ?", "ada").First(&user).Error; err != nil {
		t.Fatal(err)
	}
	if user.FirstName != "Ada" || user.LastName != "Lovelace" || user.Email != "Ada@Example.Test" || user.Password != "winter-hash" || user.RoleID != nil || user.LastLogin != nil || !user.IsActivated || user.IsSuperuser {
		t.Fatalf("winter row = %+v", user)
	}
	user.FirstName = "Augusta"
	if err := gdb.Save(&user).Error; err != nil {
		t.Fatal(err)
	}
	var perms string
	if err := gdb.Raw(`SELECT permissions FROM backend_users WHERE login = 'ada'`).Scan(&perms).Error; err != nil {
		t.Fatal(err)
	}
	if perms != `{"backend.manage_access":1}` {
		t.Fatalf("permissions rewritten to %q", perms)
	}
	if err := gdb.Delete(&user).Error; err != nil {
		t.Fatal(err)
	}
	if err := gdb.Where("login = ?", "ada").First(&winterUser{}).Error; err == nil {
		t.Fatal("soft-deleted backend user remained visible")
	}
	if err := gdb.Unscoped().Where("login = ?", "ada").First(&winterUser{}).Error; err != nil {
		t.Fatalf("unscoped load: %v", err)
	}
	if err := gdb.Exec(`INSERT INTO backend_user_roles (name, code, is_system, created_at, updated_at) VALUES ('Editor A', 'shared', FALSE, NOW(), NOW())`).Error; err != nil {
		t.Fatal(err)
	}
	if err := gdb.Exec(`INSERT INTO backend_user_roles (name, code, is_system, created_at, updated_at) VALUES ('Editor B', 'shared', FALSE, NOW(), NOW())`).Error; err != nil {
		t.Fatalf("winter-shaped roles must allow a repeated code so cutover rows load without a schema transform: %v", err)
	}
}

// winterUser mirrors cabana.BackendUser's column contract without importing
// cabana. Cabana commands call lagoon.OpenFromApp, so a lagoon test cannot
// import cabana.
type winterRole struct {
	ID       uint   `gorm:"column:id;primaryKey"`
	Name     string `gorm:"column:name"`
	Code     string `gorm:"column:code"`
	IsSystem bool   `gorm:"column:is_system"`
}

func (winterRole) TableName() string { return "backend_user_roles" }

type winterUser struct {
	ID               uint           `gorm:"column:id;primaryKey"`
	FirstName        string         `gorm:"column:first_name"`
	LastName         string         `gorm:"column:last_name"`
	Login            string         `gorm:"column:login"`
	Email            string         `gorm:"column:email"`
	Password         string         `gorm:"column:password"`
	Permissions      string         `gorm:"column:permissions"`
	IsActivated      bool           `gorm:"column:is_activated"`
	IsSuperuser      bool           `gorm:"column:is_superuser"`
	RoleID           *uint          `gorm:"column:role_id"`
	LastLogin        *time.Time     `gorm:"column:last_login"`
	DeletedAt        gorm.DeletedAt `gorm:"column:deleted_at"`
	TokensValidAfter *time.Time     `gorm:"column:tokens_valid_after"`
	Role             winterRole
}

func (winterUser) TableName() string { return "backend_users" }

type systemRole struct {
	id     int
	system bool
}

func systemRoles(t *testing.T, gdb *gorm.DB) map[string]systemRole {
	t.Helper()
	type row struct {
		ID       int
		Code     string
		System   bool
		Name     string
		Describe string
	}
	var rows []row
	if err := gdb.Raw(`SELECT id, code, is_system AS system, name, description AS describe FROM backend_user_roles WHERE code IN ('developer', 'publisher') ORDER BY code`).Scan(&rows).Error; err != nil {
		t.Fatal(err)
	}
	out := map[string]systemRole{}
	for _, row := range rows {
		if !row.System {
			t.Fatalf("%s is not a system role", row.Code)
		}
		switch row.Code {
		case "developer":
			if row.Name != "Developer" || row.Describe != "Site administrator with access to developer tools." {
				t.Fatalf("developer seed = %+v", row)
			}
		case "publisher":
			if row.Name != "Publisher" || row.Describe != "Site editor with access to publishing tools." {
				t.Fatalf("publisher seed = %+v", row)
			}
		default:
			t.Fatalf("unexpected role %s", row.Code)
		}
		out[row.Code] = systemRole{id: row.ID, system: row.System}
	}
	if _, ok := out["developer"]; !ok {
		t.Fatal("developer seed missing")
	}
	if _, ok := out["publisher"]; !ok {
		t.Fatal("publisher seed missing")
	}
	var n int64
	if err := gdb.Raw(`SELECT COUNT(*) FROM backend_user_roles WHERE is_system`).Scan(&n).Error; err != nil {
		t.Fatal(err)
	}
	if n != 2 {
		t.Fatalf("system roles = %d", n)
	}
	return out
}

func columnNullability(t *testing.T, gdb *gorm.DB, table string) map[string]bool {
	t.Helper()
	type col struct {
		Name     string
		Nullable string
	}
	var cols []col
	if err := gdb.Raw(`SELECT column_name AS name, is_nullable AS nullable FROM information_schema.columns WHERE table_schema = 'public' AND table_name = ?`, table).Scan(&cols).Error; err != nil {
		t.Fatal(err)
	}
	if len(cols) == 0 {
		t.Fatalf("table %s has no columns", table)
	}
	out := make(map[string]bool, len(cols))
	for _, c := range cols {
		out[c.Name] = c.Nullable == "YES"
	}
	return out
}

func assertColumns(t *testing.T, table string, got, want map[string]bool) {
	t.Helper()
	if len(got) != len(want) {
		t.Fatalf("%s columns = %v, want %v", table, got, want)
	}
	for name, nullable := range want {
		gotNullable, ok := got[name]
		if !ok || gotNullable != nullable {
			t.Fatalf("%s.%s nullable=%v present=%t, want nullable=%t", table, name, gotNullable, ok, nullable)
		}
	}
}

func indexDefs(t *testing.T, gdb *gorm.DB, table string) []string {
	t.Helper()
	var defs []string
	if err := gdb.Raw(`SELECT indexdef FROM pg_indexes WHERE schemaname = 'public' AND tablename = ?`, table).Scan(&defs).Error; err != nil {
		t.Fatal(err)
	}
	return defs
}

func indexOn(defs []string, column string) bool {
	needle := "(" + column + ")"
	for _, def := range defs {
		if strings.Contains(def, needle) {
			return true
		}
	}
	return false
}

func assertNoAutoMigrate(t *testing.T) {
	t.Helper()
	entries, err := os.ReadDir(".")
	if err != nil {
		t.Fatal(err)
	}
	for _, entry := range entries {
		name := entry.Name()
		if entry.IsDir() || !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
			continue
		}
		body, err := os.ReadFile(filepath.Join(".", name))
		if err != nil {
			t.Fatal(err)
		}
		if strings.Contains(string(body), "AutoMigrate") {
			t.Fatalf("%s uses AutoMigrate", name)
		}
	}
}

// rollbackBackendAdmin rolls back every BackendAdminMigrations entry, newest
// first, so the identity tables are dropped as a set.
func rollbackBackendAdmin(t *testing.T, m *gormigrate.Gormigrate) {
	t.Helper()
	for range BackendAdminMigrations {
		if err := m.RollbackLast(); err != nil {
			t.Fatal(err)
		}
	}
}

func TestBackendAdminEmailCaseInsensitiveUnique(t *testing.T) {
	db, _ := dedicatedDB(t, "lagoon_admin_email_ci")
	gdb, err := Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatal(err)
	}
	if err := gdb.Exec(`INSERT INTO backend_users (login, email, password) VALUES ('ada', 'Ada@Example.Test', 'x')`).Error; err != nil {
		t.Fatal(err)
	}
	if err := gdb.Exec(`INSERT INTO backend_users (login, email, password) VALUES ('ada-2', 'ada@example.test', 'x')`).Error; err == nil {
		t.Fatal("an email differing only in case was accepted")
	}
}

func TestBackendAdminEmailIndexRefusesCaseDuplicates(t *testing.T) {
	db, _ := dedicatedDB(t, "lagoon_admin_email_dupes")
	gdb, err := Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatal(err)
	}
	m, err := migrator(gdb, "summercms.cabana", BackendAdminMigrations)
	if err != nil {
		t.Fatal(err)
	}
	// Roll back to the identity tables, which drops the email index and the
	// later metadata column.
	if err := m.RollbackTo("202609240001_backend_admin_identity"); err != nil {
		t.Fatal(err)
	}
	// A Winter copy can hold emails that differ only in case.
	for _, row := range [][2]string{{"ada", "Ada@Example.Test"}, {"ada-old", "ada@example.test"}} {
		if err := gdb.Exec(`INSERT INTO backend_users (login, email, password) VALUES (?, ?, 'x')`, row[0], row[1]).Error; err != nil {
			t.Fatal(err)
		}
	}
	err = Migrate(gdb, nil)
	if err == nil {
		t.Fatal("migrate created the unique email index over case duplicates")
	}
	if !strings.Contains(err.Error(), "ada@example.test (logins: ada, ada-old)") {
		t.Fatalf("error does not name the duplicates: %v", err)
	}
	if err := gdb.Exec(`UPDATE backend_users SET email = 'ada.old@example.test' WHERE login = 'ada-old'`).Error; err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatalf("migrate after resolving duplicates: %v", err)
	}
	if !indexOn(indexDefs(t, gdb, "backend_users"), "lower(email)") {
		t.Fatal("unique lower(email) index missing")
	}
}

// TestBackendAdminMetadataColumn covers 202610090001_backend_users_metadata:
// WinterCMS's nullable jsonable metadata column, added last, round-tripping a
// Winter-shaped row, and a rollback that drops only that column.
func TestBackendAdminMetadataColumn(t *testing.T) {
	db, _ := dedicatedDB(t, "lagoon_admin_metadata")
	gdb, err := Use(t.Context(), db)
	if err != nil {
		t.Fatal(err)
	}
	if err := Migrate(gdb, nil); err != nil {
		t.Fatal(err)
	}
	columnType := func() (string, string, bool) {
		var cols []struct {
			DataType string
			Nullable string
		}
		if err := gdb.Raw(`SELECT data_type, is_nullable AS nullable FROM information_schema.columns WHERE table_schema = 'public' AND table_name = 'backend_users' AND column_name = 'metadata'`).Scan(&cols).Error; err != nil {
			t.Fatal(err)
		}
		if len(cols) == 0 {
			return "", "", false
		}
		return cols[0].DataType, cols[0].Nullable, true
	}
	if typ, nullable, ok := columnType(); !ok || typ != "text" || nullable != "YES" {
		t.Fatalf("metadata column type=%q nullable=%q present=%v", typ, nullable, ok)
	}
	if err := gdb.Exec(`INSERT INTO backend_users (first_name, last_name, login, email, password, permissions, metadata, is_activated, is_superuser, created_at, updated_at)
		VALUES ('Ada', 'Lovelace', 'ada', 'ada@example.test', 'winter-hash', '{}', '{"subtitle":"Editor","x":1}', TRUE, FALSE, NOW(), NOW())`).Error; err != nil {
		t.Fatal(err)
	}
	var stored *string
	if err := gdb.Raw(`SELECT metadata FROM backend_users WHERE login = 'ada'`).Scan(&stored).Error; err != nil {
		t.Fatal(err)
	}
	if stored == nil || *stored != `{"subtitle":"Editor","x":1}` {
		t.Fatalf("metadata = %v", stored)
	}

	history, err := HistoryTableName("summercms.cabana")
	if err != nil {
		t.Fatal(err)
	}
	var ids []string
	if err := gdb.Table(history).Order("id").Pluck("id", &ids).Error; err != nil {
		t.Fatal(err)
	}
	if len(ids) == 0 || ids[len(ids)-1] != "202610090001_backend_users_metadata" {
		t.Fatalf("cabana history = %v", ids)
	}
	if last := BackendAdminMigrations[len(BackendAdminMigrations)-1].ID; last != "202610090001_backend_users_metadata" {
		t.Fatalf("last BackendAdminMigrations entry = %s", last)
	}

	m, err := migrator(gdb, "summercms.cabana", BackendAdminMigrations)
	if err != nil {
		t.Fatal(err)
	}
	if err := m.RollbackLast(); err != nil {
		t.Fatal(err)
	}
	if _, _, ok := columnType(); ok {
		t.Fatal("metadata survived its rollback")
	}
	var rows []struct {
		Login string
		Email string
	}
	if err := gdb.Raw(`SELECT login, email FROM backend_users`).Scan(&rows).Error; err != nil {
		t.Fatal(err)
	}
	if len(rows) != 1 || rows[0].Login != "ada" || rows[0].Email != "ada@example.test" {
		t.Fatalf("rows after rollback = %+v", rows)
	}
	if !indexOn(indexDefs(t, gdb, "backend_users"), "lower(email)") {
		t.Fatal("rolling back metadata dropped the email index")
	}

	if err := Migrate(gdb, nil); err != nil {
		t.Fatal(err)
	}
	if typ, _, ok := columnType(); !ok || typ != "text" {
		t.Fatalf("metadata was not added back: %q %v", typ, ok)
	}
	var restored *string
	if err := gdb.Raw(`SELECT metadata FROM backend_users WHERE login = 'ada'`).Scan(&restored).Error; err != nil {
		t.Fatal(err)
	}
	if restored != nil {
		t.Fatalf("re-added metadata = %q, want NULL", *restored)
	}
}