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Testing Radian-to-Degree Conversion in javascript-algorithms

This test suite validates the radianToDegree conversion function, ensuring accurate transformation of radian measurements to degrees. The tests verify multiple common angle conversions using Jest’s testing framework and mathematical constants.

Test Coverage Overview

The test suite provides comprehensive coverage of radian to degree conversions across key angular measurements.

Tests common angle conversions (0°, 45°, 90°, 180°, 270°, 360°)
Validates against mathematical PI constant values
Covers full circle rotation scenarios

Implementation Analysis

The testing approach employs Jest’s expect assertions to verify precise mathematical conversions. The implementation uses a single describe block with multiple test cases within one it block, demonstrating concise test organization.

Uses Jest’s toBe matcher for exact equality checks
Leverages JavaScript’s Math.PI constant
Implements fractional PI calculations for precise angles

Technical Details

Testing Framework: Jest
Mathematical Constants: Math.PI
Test Pattern: Unit test with multiple assertions
File Structure: Separate test file in __test__ directory

Best Practices Demonstrated

The test suite exemplifies clean and efficient testing practices for mathematical functions.

Clear test case organization
Comprehensive angle coverage
Precise numerical comparisons
Mathematical constant utilization
Single responsibility principle in test structure

trekhleb/javascript-algorithms

src/algorithms/math/radian/__test__/radianToDegree.test.js

            
import radianToDegree from '../radianToDegree';

describe('radianToDegree', () => {
  it('should convert radian to degree', () => {
    expect(radianToDegree(0)).toBe(0);
    expect(radianToDegree(Math.PI / 4)).toBe(45);
    expect(radianToDegree(Math.PI / 2)).toBe(90);
    expect(radianToDegree(Math.PI)).toBe(180);
    expect(radianToDegree((3 * Math.PI) / 2)).toBe(270);
    expect(radianToDegree(2 * Math.PI)).toBe(360);
  });
});