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Testing Two's Complement Sign Switching Implementation in javascript-algorithms

This test suite validates the switchSign function implementation that converts positive numbers to negative and vice versa using the two’s complement approach. The tests verify the function’s ability to handle zero, positive integers, and negative integers while maintaining numerical accuracy.

Test Coverage Overview

The test coverage focuses on validating the sign switching functionality across different numeric inputs.

Key test cases include:

Zero value handling
Positive to negative conversion
Negative to positive conversion
Various integer magnitudes (1, 23, 32)

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern for structured test organization. The implementation employs expect().toBe() assertions to verify exact equality between expected and actual values, ensuring precise sign conversion outcomes.

The test leverages Jest’s built-in assertion library for streamlined test case validation.

Technical Details

Testing tools and setup:

Jest testing framework
ES6 module import syntax
Describe/It block structure
Equality assertions

Best Practices Demonstrated

The test suite exhibits several testing best practices including:

Single responsibility principle – focused test scope
Clear test case organization
Comprehensive edge case coverage
Consistent assertion pattern usage
Descriptive test naming conventions

trekhleb/javascript-algorithms

src/algorithms/math/bits/__test__/switchSign.test.js

            
import switchSign from '../switchSign';

describe('switchSign', () => {
  it('should switch the sign of the number using twos complement approach', () => {
    expect(switchSign(0)).toBe(0);
    expect(switchSign(1)).toBe(-1);
    expect(switchSign(-1)).toBe(1);
    expect(switchSign(32)).toBe(-32);
    expect(switchSign(-32)).toBe(32);
    expect(switchSign(23)).toBe(-23);
    expect(switchSign(-23)).toBe(23);
  });
});