Back to Repositories

Testing Binary Bit Clearing Operations in javascript-algorithms

This test suite validates the clearBit function’s ability to manipulate binary numbers by clearing specific bit positions. It examines the function’s behavior with different input numbers and bit positions, ensuring accurate bit manipulation operations.

Test Coverage Overview

The test suite provides comprehensive coverage of the clearBit function’s core functionality.

Key areas tested include:

Basic bit clearing at position 0
Clearing bits at different positions
Testing with both simple (1) and complex (10) binary numbers
Edge cases for unchanged bits

Implementation Analysis

The testing approach utilizes Jest’s expect assertions to verify bit manipulation outcomes. The tests employ binary number representations (0b0001, 0b1010) to validate the clearBit function’s ability to modify specific bit positions while maintaining the integrity of other bits.

The implementation leverages Jest’s toBe matcher for precise equality checking of the resulting values.

Technical Details

Testing tools and configuration:

Jest testing framework
Binary number operations
Individual test cases with specific bit positions
Direct import of clearBit function
Explicit test case documentation with binary representations

Best Practices Demonstrated

The test suite demonstrates several testing best practices for bit manipulation operations.

Notable practices include:

Clear test case organization
Explicit binary number documentation
Multiple assertions per test scenario
Comprehensive position testing
Clear expected vs actual value comparisons

trekhleb/javascript-algorithms

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

            
import clearBit from '../clearBit';

describe('clearBit', () => {
  it('should clear bit at specific position', () => {
    // 1 = 0b0001
    expect(clearBit(1, 0)).toBe(0);
    expect(clearBit(1, 1)).toBe(1);
    expect(clearBit(1, 2)).toBe(1);

    // 10 = 0b1010
    expect(clearBit(10, 0)).toBe(10);
    expect(clearBit(10, 1)).toBe(8);
    expect(clearBit(10, 3)).toBe(2);
  });
});