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Testing BucketSort Algorithm Implementation in javascript-algorithms

This test suite validates the BucketSort algorithm implementation by testing its sorting capabilities across different bucket sizes and array configurations. The tests ensure the algorithm correctly handles various input scenarios including unsorted, sorted, equal, and reverse-ordered arrays.

Test Coverage Overview

The test suite provides comprehensive coverage of the BucketSort algorithm functionality.

Tests sorting with different bucket sizes (4, 10, 50)
Validates behavior with various array types (unsorted, sorted, equal elements, reverse ordered)
Verifies default bucket size handling
Ensures consistent output matches expected sorted arrays

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern for organized test grouping. The implementation leverages shared test arrays imported from SortTester, promoting code reuse and consistency across sorting algorithm tests.

Uses Jest’s expect().toEqual() for array comparison
Implements multiple test cases in single it blocks for efficiency
Employs descriptive test naming conventions

Technical Details

Testing Framework: Jest
Test Utilities: SortTester helper module
Test Data: Pre-defined array configurations (notSortedArr, equalArr, reverseArr, sortedArr)
Assertion Style: Expect syntax with strict equality comparison

Best Practices Demonstrated

The test suite exemplifies several testing best practices for algorithm validation.

Comprehensive edge case coverage
Consistent test data across different scenarios
Clear test descriptions and organization
Modular test data management
Efficient test case grouping

trekhleb/javascript-algorithms

src/algorithms/sorting/bucket-sort/__test__/BucketSort.test.js

            
import BucketSort from '../BucketSort';
import {
  equalArr,
  notSortedArr,
  reverseArr,
  sortedArr,
} from '../../SortTester';

describe('BucketSort', () => {
  it('should sort the array of numbers with different buckets amounts', () => {
    expect(BucketSort(notSortedArr, 4)).toEqual(sortedArr);
    expect(BucketSort(equalArr, 4)).toEqual(equalArr);
    expect(BucketSort(reverseArr, 4)).toEqual(sortedArr);
    expect(BucketSort(sortedArr, 4)).toEqual(sortedArr);

    expect(BucketSort(notSortedArr, 10)).toEqual(sortedArr);
    expect(BucketSort(equalArr, 10)).toEqual(equalArr);
    expect(BucketSort(reverseArr, 10)).toEqual(sortedArr);
    expect(BucketSort(sortedArr, 10)).toEqual(sortedArr);

    expect(BucketSort(notSortedArr, 50)).toEqual(sortedArr);
    expect(BucketSort(equalArr, 50)).toEqual(equalArr);
    expect(BucketSort(reverseArr, 50)).toEqual(sortedArr);
    expect(BucketSort(sortedArr, 50)).toEqual(sortedArr);
  });

  it('should sort the array of numbers with the default buckets of 1', () => {
    expect(BucketSort(notSortedArr)).toEqual(sortedArr);
    expect(BucketSort(equalArr)).toEqual(equalArr);
    expect(BucketSort(reverseArr)).toEqual(sortedArr);
    expect(BucketSort(sortedArr)).toEqual(sortedArr);
  });
});