add a test for sql-js#561

Author: lovasoa

test/test_long_sql_statement.js

@@ -6,6 +6,7 @@ exports.test = function (sql, assert) {
     var many_a = "";
     for (var i = 0; i < len; i++) many_a += 'a';
 
+    console.log('xxx');
     var res = db.exec("select length('" + many_a + "') as len");
     var expectedResult = [
         {