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Testing Binary Addition Implementation in javascript-algorithms

This test suite validates the fullAdder function implementation in the javascript-algorithms repository, focusing on binary addition operations. The tests verify correct addition behavior across various number combinations including positive, negative, and zero values.

Test Coverage Overview

The test suite provides comprehensive coverage of the fullAdder function’s capabilities.

Key areas tested include:

Zero value handling (0+0)
Positive number combinations
Negative number operations
Asymmetric inputs
Large number additions

Edge cases are well-covered through testing of zero values, negative numbers, and varying number magnitudes.

Implementation Analysis

The testing approach employs Jest’s describe/it pattern for structured test organization. The implementation uses Jest’s expect().toBe() assertions to verify exact numerical outputs.

The test suite demonstrates:

Multiple test cases in a single it block
Symmetric input testing (a+b and b+a)
Boundary value analysis

Technical Details

Testing infrastructure includes:

Jest testing framework
ES6 module import syntax
Numerical comparison assertions
Single describe block architecture
Focused test case organization

Best Practices Demonstrated

The test suite exhibits several testing best practices including comprehensive edge case coverage and symmetric input validation. Notable practices include:

Consistent assertion pattern usage
Logical test case organization
Clear test descriptions
Efficient test case grouping
Thorough boundary testing

trekhleb/javascript-algorithms

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

            
import fullAdder from '../fullAdder';

describe('fullAdder', () => {
  it('should add up two numbers', () => {
    expect(fullAdder(0, 0)).toBe(0);
    expect(fullAdder(2, 0)).toBe(2);
    expect(fullAdder(0, 2)).toBe(2);
    expect(fullAdder(1, 2)).toBe(3);
    expect(fullAdder(2, 1)).toBe(3);
    expect(fullAdder(6, 6)).toBe(12);
    expect(fullAdder(-2, 4)).toBe(2);
    expect(fullAdder(4, -2)).toBe(2);
    expect(fullAdder(-4, -4)).toBe(-8);
    expect(fullAdder(4, -5)).toBe(-1);
    expect(fullAdder(2, 121)).toBe(123);
    expect(fullAdder(121, 2)).toBe(123);
  });
});