这可能是由于测试过程中的事务没有正确地回滚所导致的。可以尝试在测试后手动回滚事务，或者使用测试框架提供的事务撤销功能。以下是一个使用Mocha和Chai测试框架的示例代码：

describe('E2E tests with database transactions', function() {
  let db;

  before(function() {
    // Set up database connection
    db = new Database();
    // Initialize database with test data
    db.init();
  });

  after(function() {
    // Close database connection
    db.close();
  });

  it('should perform transaction successfully', async function() {
    let result;
    try {
      // Start a database transaction
      await db.beginTransaction();
      // Perform database operations
      await db.updateUser(1, {name: 'Bob'});
      await db.updateOrder(1, {status: 'completed'});
      // Commit the transaction
      await db.commitTransaction();
      // Verify that the results are as expected
      const user = await db.getUser(1);
      const order = await db.getOrder(1);
      expect(user.name).to.equal('Bob');
      expect(order.status).to.equal('completed');
    } catch (err) {
      // Rollback the transaction on error
      await db.rollbackTransaction();
      throw err;
    }
  });
});