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Testing Unsigned Integer Multiplication in javascript-algorithms

This test suite validates the multiplyUnsigned function’s ability to perform multiplication operations on unsigned integers using bitwise operations. The tests ensure accurate multiplication results across various number combinations, from simple single-digit to larger multi-digit values.

Test Coverage Overview

The test suite provides comprehensive coverage of unsigned integer multiplication scenarios.

Key areas tested include:

Zero multiplication cases (0 × n)
Identity multiplication (1 × n)
Small number combinations
Larger number multiplication
Commutative property verification (a × b = b × a)

Implementation Analysis

The testing approach employs Jest’s expect assertions to verify multiplication results. The implementation follows a systematic pattern of testing increasingly complex scenarios, starting with edge cases and progressing to larger numbers.

Framework features utilized:

Jest’s describe/it block structure
toBe matcher for exact equality comparison
Multiple test cases within single test block

Technical Details

Testing infrastructure includes:

Jest testing framework
ES6 module import syntax
Single describe block architecture
Direct function testing without mocks
Synchronous test execution

Best Practices Demonstrated

The test suite exemplifies several testing best practices in JavaScript algorithm validation.

Notable practices include:

Comprehensive edge case coverage
Progressive complexity in test cases
Clear and consistent test case organization
Verification of mathematical properties
Efficient test case grouping

trekhleb/javascript-algorithms

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

            
import multiplyUnsigned from '../multiplyUnsigned';

describe('multiplyUnsigned', () => {
  it('should multiply two unsigned numbers', () => {
    expect(multiplyUnsigned(0, 2)).toBe(0);
    expect(multiplyUnsigned(2, 0)).toBe(0);
    expect(multiplyUnsigned(1, 1)).toBe(1);
    expect(multiplyUnsigned(1, 2)).toBe(2);
    expect(multiplyUnsigned(2, 7)).toBe(14);
    expect(multiplyUnsigned(7, 2)).toBe(14);
    expect(multiplyUnsigned(30, 2)).toBe(60);
    expect(multiplyUnsigned(17, 34)).toBe(578);
    expect(multiplyUnsigned(170, 2340)).toBe(397800);
  });
});