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Testing Binary Difference Calculation in javascript-algorithms

This test suite validates the bitsDiff function that calculates the number of different bits between two integers. The tests verify the function’s ability to compare binary representations of numbers and count bit differences accurately.

Test Coverage Overview

The test coverage focuses on validating the bitsDiff function across various number combinations.

Tests identical numbers (0, 1, 124) expecting 0 differences
Validates adjacent numbers (0-1, 1-2)
Checks non-sequential numbers (1-3)
Covers both positive integers and zero

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern for organizing test cases. The implementation employs expect().toBe() assertions to verify exact numeric outputs from the bitsDiff function.

Uses Jest’s built-in assertion methods
Multiple test cases within single test block
Direct comparison of expected vs actual results

Technical Details

Testing environment configuration:

Jest testing framework
ES6 module import syntax
Unit test isolation
Direct function import testing
Numeric comparison assertions

Best Practices Demonstrated

The test suite demonstrates several testing best practices in its implementation.

Clear test case organization
Comprehensive edge case coverage
Consistent assertion pattern
Descriptive test naming
Efficient test case grouping

trekhleb/javascript-algorithms

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

            
import bitsDiff from '../bitsDiff';

describe('bitsDiff', () => {
  it('should calculate bits difference between two numbers', () => {
    expect(bitsDiff(0, 0)).toBe(0);
    expect(bitsDiff(1, 1)).toBe(0);
    expect(bitsDiff(124, 124)).toBe(0);
    expect(bitsDiff(0, 1)).toBe(1);
    expect(bitsDiff(1, 0)).toBe(1);
    expect(bitsDiff(1, 2)).toBe(2);
    expect(bitsDiff(1, 3)).toBe(1);
  });
});