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Testing Linked List Traversal Implementation in javascript-algorithms

Unit tests for the linked list traversal implementation, validating correct node visitation order and callback execution. This test suite ensures proper iteration through a linked list data structure while maintaining data integrity.

Test Coverage Overview

The test suite provides essential coverage for linked list traversal operations.

Key areas tested include:

Sequential node visitation
Callback execution for each node
Value collection and ordering verification
Basic linked list operations integration

Implementation Analysis

The testing approach employs Jest’s describe/it pattern for structured test organization. The implementation uses a callback-based traversal mechanism, allowing flexible node value processing during iteration.

Technical patterns include:

Callback function implementation
Array-based result verification
Fluent interface usage for list construction

Technical Details

Testing infrastructure includes:

Jest testing framework
LinkedList data structure implementation
Custom traversal function
Array-based result validation

Best Practices Demonstrated

The test suite exemplifies clean testing practices through focused test cases and clear assertions.

Notable practices include:

Single responsibility principle in test design
Clear test case isolation
Descriptive test naming
Effective use of Jest’s expect assertions

trekhleb/javascript-algorithms

src/algorithms/linked-list/traversal/__test__/traversal.test.js

            
import LinkedList from '../../../../data-structures/linked-list/LinkedList';
import traversal from '../traversal';

describe('traversal', () => {
  it('should traverse linked list', () => {
    const linkedList = new LinkedList();

    linkedList
      .append(1)
      .append(2)
      .append(3);

    const traversedNodeValues = [];
    const traversalCallback = (nodeValue) => {
      traversedNodeValues.push(nodeValue);
    };

    traversal(linkedList, traversalCallback);

    expect(traversedNodeValues).toEqual([1, 2, 3]);
  });
});