text: -- wal.test
  -- 
  -- execsql {
  --     PRAGMA journal_mode = WAL;
  --     CREATE TABLE t1(a, b);
  --     INSERT INTO t1 VALUES(1, 2);
  --     INSERT INTO t1 VALUES(3, 4);
  -- }
  PRAGMA journal_mode = WAL;
  CREATE TABLE t1(a, b);
  INSERT INTO t1 VALUES(1, 2);
  INSERT INTO t1 VALUES(3, 4);