The video tutorial demonstrates the process of testing for SQL injection vulnerabilities using SQL Map. Initially, the test is unsuccessful, indicating that parameters are not injectable. The instructor explains that this could be due to a web application firewall (WAF) blocking the traffic. To overcome this, a tamper script is used, which successfully bypasses the WAF and confirms the vulnerability. The tutorial emphasizes the importance of persistence and the use of tamper scripts in SQL injection testing.

What is the significance of using a tamper script in SQL injection testing?

What lesson can be learned from the experience of initially being unsuccessful in SQL injection testing?