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Testing Binary Bit Setting Operations in javascript-algorithms

This test suite validates the setBit function’s ability to manipulate binary numbers by setting specific bits at given positions. It verifies both basic bit operations and position-based modifications in binary representations of integers.

Test Coverage Overview

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

Key areas tested include:

Setting bits at position 0 (least significant bit)
Setting bits at various positions (1,2)
Testing with different input numbers (1 and 10)
Verification of binary operations through decimal equivalents

Implementation Analysis

The testing approach utilizes Jest’s expect assertions to verify bit manipulation outcomes. The implementation follows a pattern of testing binary operations through decimal equivalents, making the tests more readable and maintainable.

Technical specifics include:

Direct comparison of function output with expected decimal values
Multiple test cases within a single test block
Binary-to-decimal verification approach

Technical Details

Testing environment components:

Jest testing framework
ES6 module import syntax
Binary operation testing utilities
Decimal comparison for verification

Best Practices Demonstrated

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

Notable practices include:

Clear test case organization
Comprehensive input value coverage
Descriptive test naming
Efficient test case grouping
Binary operation documentation in comments

trekhleb/javascript-algorithms

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

            
import setBit from '../setBit';

describe('setBit', () => {
  it('should set bit at specific position', () => {
    // 1 = 0b0001
    expect(setBit(1, 0)).toBe(1);
    expect(setBit(1, 1)).toBe(3);
    expect(setBit(1, 2)).toBe(5);

    // 10 = 0b1010
    expect(setBit(10, 0)).toBe(11);
    expect(setBit(10, 1)).toBe(10);
    expect(setBit(10, 2)).toBe(14);
  });
});