memdb WAL.

tests/db_test.go

@@ -93,6 +93,9 @@ func testDB(t testing.TB, name string) {
 		id := stmt.ColumnInt(0)
 		name := stmt.ColumnText(1)
 
+		if row >= 3 {
+			continue
+		}
 		if id != ids[row] {
 			t.Errorf("got %d, want %d", id, ids[row])
 		}

vfs/memdb/api.go

@@ -36,6 +36,12 @@ func Create(name string, data []byte) {
 	db := new(memDB)
 	db.size = int64(len(data))
 
+	// Convert data from WAL to rollback journal.
+	if len(data) >= 20 && data[18] == 2 && data[19] == 2 {
+		data[18] = 1
+		data[19] = 1
+	}
+
 	sectors := divRoundUp(db.size, sectorSize)
 	db.data = make([]*[sectorSize]byte, sectors)
 	for i := range db.data {

vfs/memdb/memdb_test.go

@@ -0,0 +1,28 @@
+package memdb
+
+import (
+	"testing"
+
+	_ "embed"
+
+	"github.com/ncruces/go-sqlite3"
+	_ "github.com/ncruces/go-sqlite3/embed"
+)
+
+//go:embed testdata/wal.db
+var walDB []byte
+
+func Test_wal(t *testing.T) {
+	Create("test.db", walDB)
+
+	db, err := sqlite3.Open("file:/test.db?vfs=memdb")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+
+	err = db.Exec(`CREATE TABLE IF NOT EXISTS users (id INT, name VARCHAR(10))`)
+	if err != nil {
+		t.Fatal(err)
+	}
+}