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Testing RadixSort Algorithm Implementation in javascript-algorithms

This test suite validates the implementation of Radix Sort algorithm, focusing on both string and integer sorting capabilities. The tests verify correct sorting behavior and validate the expected time complexity for different input types.

Test Coverage Overview

The test suite provides comprehensive coverage of RadixSort functionality:

Basic array sorting validation
Time complexity verification for string arrays
Time complexity verification for integer arrays
Specific visit count validation for both data types

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern with the SortTester utility class for standardized sort testing. The implementation specifically tracks algorithm visits using constant values ARRAY_OF_STRINGS_VISIT_COUNT (24) and ARRAY_OF_INTEGERS_VISIT_COUNT (77) to ensure optimal performance.

Technical Details

Testing infrastructure includes:

Jest testing framework
Custom SortTester utility class
Time complexity validation methods
Predefined test data sets for both strings and integers

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Separation of test utilities (SortTester)
Explicit complexity validation
Clear test case organization
Comprehensive edge case coverage with different data types

trekhleb/javascript-algorithms

src/algorithms/sorting/radix-sort/__test__/RadixSort.test.js

            
import RadixSort from '../RadixSort';
import { SortTester } from '../../SortTester';

// Complexity constants.
const ARRAY_OF_STRINGS_VISIT_COUNT = 24;
const ARRAY_OF_INTEGERS_VISIT_COUNT = 77;
describe('RadixSort', () => {
  it('should sort array', () => {
    SortTester.testSort(RadixSort);
  });

  it('should visit array of strings n (number of strings) x m (length of longest element) times', () => {
    SortTester.testAlgorithmTimeComplexity(
      RadixSort,
      ['zzz', 'bb', 'a', 'rr', 'rrb', 'rrba'],
      ARRAY_OF_STRINGS_VISIT_COUNT,
    );
  });

  it('should visit array of integers n (number of elements) x m (length of longest integer) times', () => {
    SortTester.testAlgorithmTimeComplexity(
      RadixSort,
      [3, 1, 75, 32, 884, 523, 4343456, 232, 123, 656, 343],
      ARRAY_OF_INTEGERS_VISIT_COUNT,
    );
  });
});