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Testing Number Parity Detection in javascript-algorithms

This test suite validates the isEven function’s ability to determine whether numbers are even or odd. It comprehensively tests positive numbers, negative numbers, and zero using Jest’s testing framework.

Test Coverage Overview

The test suite provides thorough coverage of the isEven function’s core functionality.

Key areas tested include:

Zero handling
Positive even and odd numbers
Negative even and odd numbers
Large numbers

Edge cases like zero and negative numbers are explicitly verified to ensure robust functionality.

Implementation Analysis

The testing approach uses Jest’s expect assertions with toBe matchers to verify boolean return values. Multiple test cases are grouped within a single test block using a clear, concise pattern. The implementation demonstrates efficient test case organization with progressive complexity from simple to more complex numbers.

Technical Details

Testing stack includes:

Jest testing framework
ES6 import/export syntax
Describe/it block structure
toBe matcher for boolean assertions

The setup leverages Jest’s built-in assertion library for straightforward boolean comparisons.

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

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

Code organization follows Jest conventions with clear separation of test cases and logical grouping of related scenarios.

trekhleb/javascript-algorithms

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

            
import isEven from '../isEven';

describe('isEven', () => {
  it('should detect if a number is even', () => {
    expect(isEven(0)).toBe(true);
    expect(isEven(2)).toBe(true);
    expect(isEven(-2)).toBe(true);
    expect(isEven(1)).toBe(false);
    expect(isEven(-1)).toBe(false);
    expect(isEven(-3)).toBe(false);
    expect(isEven(3)).toBe(false);
    expect(isEven(8)).toBe(true);
    expect(isEven(9)).toBe(false);
    expect(isEven(121)).toBe(false);
    expect(isEven(122)).toBe(true);
    expect(isEven(1201)).toBe(false);
    expect(isEven(1202)).toBe(true);
  });
});