Sri Lanka GCE O/L IT subject syllabus related slides are here. Most of these are cover in basics of computer science and engineering. You may find Software testing related information in here.

1. Software testing

2. • What is testing
• Why we need testing
• What are the main types

3. Verification and Validation
• What is verification
• verification is the process of checking that the software meets the
specification
• What is validation
• Validation is the process of checking whether the specification captures the
customer's needs

4. Types of Testing
• Unit Testing
• Integration Testing
• Functional Testing
• System Testing
• Stress Testing
• Performance Testing
• Usability Testing
• Acceptance Testing

5. Question
• Order the following testing activities
A – Unit Testing
B – Integration Testing
C – System Testing
D – Acceptance Testing