Function update

test/integration/transaction.test.js:443–476

(sequelize, Task, from, to)

        class="cm">// Lock the row with id of `from`, and then try to update the row
        class="cm">// with id of `to`
        const update = async (sequelize, Task, from, to) => {
          await sequelize
            .transaction(async transaction => {
              try {
                try {
                  await Task.findAll({
                    where: { id: { [Sequelize.Op.eq]: from } },
                    lock: transaction.LOCK.UPDATE,
                    transaction
                  });

                  await delay(10);

                  await Task.update(
                    { id: to },
                    {
                      where: { id: { [Sequelize.Op.ne]: to } },
                      lock: transaction.LOCK.UPDATE,
                      transaction
                    }
                  );
                } catch (e) {
                  console.log(e.message);
                }

                await Task.create({ id: 2 }, { transaction });
              } catch (e) {
                console.log(e.message);
              }

              throw new Error(class="st">'Rollback!');
            })
            .catch(() => {});
        };

        it(class="st">'should treat deadlocked transaction as rollback', async function() {
          const Task = await getAndInitializeTaskModel(this.sequelize);