Types of Testing
Learn about different types of testing and when to use each. This is a foundational concept in quality assurance and test automation that professional developers rely on daily. The explanations below are written to be beginner-friendly while covering the depth and nuance that comes from real-world Software Testing experience. Take your time with each section and practice the examples
40 min•By Priygop Team•Last updated: Feb 2026
functional Testing
- Unit Testing: Testing individual components
- Integration Testing: Testing component interactions
- System Testing: Testing complete system
- Acceptance Testing: User acceptance validation
- Smoke Testing: Basic functionality verification
- Sanity Testing: Quick validation after changes
Non-functional Testing
- Performance Testing: Speed and responsiveness
- Load Testing: Normal expected load
- Stress Testing: Beyond normal capacity
- security Testing: Vulnerability assessment
- Usability Testing: User experience validation
- Compatibility Testing: Cross-platform testing
Testing Types by Approach
Example
// Manual Testing
// Human tester executes test cases manually
function manualLoginTest() {
// 1. Open browser
// 2. Navigate to login page
// 3. Enter username
// 4. Enter password
// 5. Click login button
// 6. Verify dashboard appears
// 7. Log results
}
// Automated Testing
// Test scripts execute automatically
describe('Login functionality', () => {
test('should login with valid credentials', () => {
const result = login('user', 'pass');
expect(result.success).toBe(true);
});
test('should fail with invalid credentials', () => {
const result = login('user', 'wrong');
expect(result.success).toBe(false);
});
});
// Black Box Testing
// Testing without knowledge of internal code
function testUserRegistration() {
// Input: User data
// Expected: User created successfully
// Don't need to know internal implementation
}
// White Box Testing
// Testing with knowledge of internal code
function testDatabaseConnection() {
// Need to know database implementation
// Test internal database logic
// Verify SQL queries work correctly
}