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Testing Bitwise Division Operations in javascript-algorithms

This test suite validates the divideByTwo function which performs binary division by 2 using bitwise operations in JavaScript. The tests verify correct integer division behavior across various input values, ensuring the bitwise implementation produces accurate results.

Test Coverage Overview

The test coverage focuses on validating the divideByTwo function’s ability to perform division using bitwise operations.

Key test cases include:

Zero input value handling
Odd and even number division
Small and large integer values
Edge case with value 1

Integration points verify the function’s compatibility with Jest’s assertion framework.

Implementation Analysis

The testing approach employs Jest’s describe/it pattern for organizing test cases, with multiple expect statements validating different input scenarios. The implementation uses toBe() matcher for exact equality comparison, demonstrating bitwise division results against expected quotients.

The test structure follows Jest’s standard patterns with inline test cases, making use of the framework’s built-in assertion capabilities.

Technical Details

Testing tools and setup:

Jest testing framework
ES6 import/export syntax
Describe/It block structure
toBe() matcher for assertions
Inline test case organization

Best Practices Demonstrated

The test suite demonstrates several testing best practices including comprehensive input value coverage and clear test case organization. Notable practices include:

Single responsibility principle in test cases
Clear test descriptions
Multiple assertion points for thorough validation
Efficient test case organization
Proper import structure

trekhleb/javascript-algorithms

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

            
import divideByTwo from '../divideByTwo';

describe('divideByTwo', () => {
  it('should divide numbers by two using bitwise operations', () => {
    expect(divideByTwo(0)).toBe(0);
    expect(divideByTwo(1)).toBe(0);
    expect(divideByTwo(3)).toBe(1);
    expect(divideByTwo(10)).toBe(5);
    expect(divideByTwo(17)).toBe(8);
    expect(divideByTwo(125)).toBe(62);
  });
});