JAVASCRIPT Tutorial

Testing

Understanding Testing

Testing validates that software meets its intended requirements. It exposes bugs, ensuring product reliability.

Types of Tests

Unit Tests: Test individual program's functions separately.
Integration Tests: Test interactions between different components.
Functional Tests: Test system's behavior against user requirements.

Test-Driven Development (TDD)

TDD is a practice where tests are written before the actual code, promoting early bug detection and focused development.

JavaScript Example: Unit Test

// Unit test for a function that adds two numbers
test('addNumbers function should return the sum of two numbers', () => {
  // Arrange: Set up data for testing
  const num1 = 10;
  const num2 = 20;

  // Act: Execute the function
  const result = addNumbers(num1, num2);

  // Assert: Verify the expected result
  expect(result).toBe(30);
});

Practical Steps for Writing Tests

Identify test cases: Scenarios where the code should succeed or fail.
Write unit tests: Test individual functions independently.
Write integration tests: Test the interactions between components.
Run tests regularly: Ensure that changes don't break existing functionality.
Use automated testing tools: Speed up and improve test coverage.

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