Software Development Lifecycle (SDLC): End-to-End Overview

Testing ensures software meets functional and non-functional requirements.

It Helps catch defects early, reducing cost and effort.

It Enhances user satisfaction and product reliability.

It Reduces risk of production failures and security vulnerabilities.

Testing is part of quality assurance (QA) to maintain standards.

Types of Testing

1. Unit Testing

• Tests individual units/modules of code.
• Ensures each piece works as expected.
• Tools: JUnit (Java), pytest (Python), Jest (JavaScript).

2. Integration Testing

• Tests interaction between modules.
• Detects interface defects.
• Example: API integration testing.

3. System Testing

• Tests the complete integrated system.
• Validates the system against requirements.
• Types: functional and non-functional system testing.

4. Acceptance Testing

• Ensures software meets business requirements.
• Often performed by end-users.
• Includes User Acceptance Testing (UAT).