diff --git a/driver/driver.go b/driver/driver.go
index e7863b1..3ded80a 100644
--- a/driver/driver.go
+++ b/driver/driver.go
@@ -231,6 +231,7 @@ func (c *conn) Raw() *sqlite3.Conn {
 
 // Deprecated: use BeginTx instead.
 func (c *conn) Begin() (driver.Tx, error) {
+	// notest
 	return c.BeginTx(context.Background(), driver.TxOptions{})
 }
 
@@ -287,6 +288,7 @@ func (c *conn) Rollback() error {
 }
 
 func (c *conn) Prepare(query string) (driver.Stmt, error) {
+	// notest
 	return c.PrepareContext(context.Background(), query)
 }
 
@@ -363,11 +365,13 @@ func (s *stmt) NumInput() int {
 
 // Deprecated: use ExecContext instead.
 func (s *stmt) Exec(args []driver.Value) (driver.Result, error) {
+	// notest
 	return s.ExecContext(context.Background(), namedValues(args))
 }
 
 // Deprecated: use QueryContext instead.
 func (s *stmt) Query(args []driver.Value) (driver.Rows, error) {
+	// notest
 	return s.QueryContext(context.Background(), namedValues(args))
 }
 
diff --git a/ext/bloom/bloom.go b/ext/bloom/bloom.go
index b1285b5..cda142d 100644
--- a/ext/bloom/bloom.go
+++ b/ext/bloom/bloom.go
@@ -328,6 +328,7 @@ func (c *cursor) EOF() bool {
 }
 
 func (c *cursor) RowID() (int64, error) {
+	// notest // WITHOUT ROWID
 	return 0, nil
 }
 
diff --git a/ext/pivot/pivot_test.go b/ext/pivot/pivot_test.go
index c8ccd6a..41b8389 100644
--- a/ext/pivot/pivot_test.go
+++ b/ext/pivot/pivot_test.go
@@ -144,6 +144,11 @@ func TestRegister(t *testing.T) {
 			t.Errorf("got %d, want 3", got)
 		}
 	}
+
+	err = db.Exec(`ALTER TABLE v_x RENAME TO v_y`)
+	if err != nil {
+		t.Fatal(err)
+	}
 }
 
 func TestRegister_errors(t *testing.T) {
diff --git a/ext/zorder/zorder.go b/ext/zorder/zorder.go
index 9ba6e47..37f8e71 100644
--- a/ext/zorder/zorder.go
+++ b/ext/zorder/zorder.go
@@ -20,17 +20,17 @@ func Register(db *sqlite3.Conn) error {
 
 func zorder(ctx sqlite3.Context, arg ...sqlite3.Value) {
 	var x [63]int64
-	for i := range arg {
-		x[i] = arg[i].Int64()
-	}
 	if len(arg) > len(x) {
 		ctx.ResultError(util.ErrorString("zorder: too many parameters"))
 		return
 	}
+	for i := range arg {
+		x[i] = arg[i].Int64()
+	}
 
 	var z int64
 	if len(arg) > 0 {
-		for i := 0; i < 63; i++ {
+		for i := range x {
 			j := i % len(arg)
 			z |= (x[j] & 1) << i
 			x[j] >>= 1
diff --git a/ext/zorder/zorder_test.go b/ext/zorder/zorder_test.go
index fd2632a..484ca4d 100644
--- a/ext/zorder/zorder_test.go
+++ b/ext/zorder/zorder_test.go
@@ -1,6 +1,8 @@
 package zorder_test
 
 import (
+	"strconv"
+	"strings"
 	"testing"
 
 	"github.com/ncruces/go-sqlite3/driver"
@@ -94,4 +96,16 @@ func TestRegister_error(t *testing.T) {
 	if err == nil {
 		t.Error("want error")
 	}
+
+	var buf strings.Builder
+	buf.WriteString("SELECT zorder(0")
+	for i := 1; i < 80; i++ {
+		buf.WriteByte(',')
+		buf.WriteString(strconv.Itoa(0))
+	}
+	buf.WriteByte(')')
+	err = db.QueryRow(buf.String()).Scan(&got)
+	if err == nil {
+		t.Error("want error")
+	}
 }
diff --git a/tests/conn_test.go b/tests/conn_test.go
index 2525bcc..aba68c1 100644
--- a/tests/conn_test.go
+++ b/tests/conn_test.go
@@ -172,6 +172,11 @@ func TestConn_SetInterrupt(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+
+	db.SetInterrupt(ctx)
+	if got := db.GetInterrupt(); got != ctx {
+		t.Errorf("got %v, want %v", got, ctx)
+	}
 }
 
 func TestConn_Prepare_empty(t *testing.T) {
@@ -372,13 +377,25 @@ func TestConn_SetAuthorizer(t *testing.T) {
 	defer db.Close()
 
 	err = db.SetAuthorizer(func(action sqlite3.AuthorizerActionCode, name3rd, name4th, schema, nameInner string) sqlite3.AuthorizerReturnCode {
+		if action != sqlite3.AUTH_PRAGMA {
+			t.Errorf("got %v, want PRAGMA", action)
+		}
+		if name3rd != "busy_timeout" {
+			t.Errorf("got %q, want busy_timeout", name3rd)
+		}
+		if name4th != "5000" {
+			t.Errorf("got %q, want 5000", name4th)
+		}
+		if schema != "main" {
+			t.Errorf("got %q, want main", schema)
+		}
 		return sqlite3.AUTH_DENY
 	})
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	err = db.Exec(`SELECT * FROM sqlite_schema`)
+	err = db.Exec(`PRAGMA main.busy_timeout=5000`)
 	if !errors.Is(err, sqlite3.AUTH) {
 		t.Errorf("got %v, want sqlite3.AUTH", err)
 	}