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Testing Recursive Factorial Calculations in javascript-algorithms

This test suite validates the recursive factorial calculation implementation in the javascript-algorithms repository. The tests verify the accuracy of factorial computations for various input values, ensuring the recursive algorithm handles both base cases and larger numbers correctly.

Test Coverage Overview

The test coverage focuses on validating factorial calculations across different input ranges.

Tests base cases (0 and 1)
Validates small integers (5)
Confirms larger calculations (8 and 10)
Ensures accurate results for all test cases

Implementation Analysis

The testing approach employs Jest’s describe/it pattern for clear test organization. The implementation uses expect().toBe() assertions to verify exact numerical outputs, ensuring precise factorial calculations match expected results.

Uses Jest’s standard testing syntax
Implements straightforward numerical comparisons
Focuses on pure function testing

Technical Details

Testing Framework: Jest
Test Type: Unit Test
File Structure: Modular test file
Import Pattern: ES6 module import
Assertion Style: Jest’s expect syntax

Best Practices Demonstrated

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

Clear test case organization
Comprehensive input range coverage
Isolated function testing
Descriptive test naming
Efficient assertion patterns

trekhleb/javascript-algorithms

src/algorithms/math/factorial/__test__/factorialRecursive.test.js

            
import factorialRecursive from '../factorialRecursive';

describe('factorialRecursive', () => {
  it('should calculate factorial', () => {
    expect(factorialRecursive(0)).toBe(1);
    expect(factorialRecursive(1)).toBe(1);
    expect(factorialRecursive(5)).toBe(120);
    expect(factorialRecursive(8)).toBe(40320);
    expect(factorialRecursive(10)).toBe(3628800);
  });
});