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Testing Knight's Tour Algorithm Implementation in javascript-algorithms

This test suite validates the Knight’s Tour algorithm implementation, which finds a sequence of moves for a knight to visit every square on a chess board exactly once. The tests verify both successful path finding on a 5×5 board and handling of impossible scenarios on smaller boards.

Test Coverage Overview

The test suite provides comprehensive coverage of the Knight’s Tour algorithm implementation by testing both successful and unsuccessful scenarios.

Tests invalid board size (3×3) handling
Validates complete solution path for 5×5 board
Verifies exact move sequence and coordinates
Checks total number of moves matches board size

Implementation Analysis

The testing approach uses Jest’s assertion framework to validate the Knight’s Tour algorithm outputs. It employs precise coordinate validation and array comparison to verify move sequences.

Uses Jest’s expect().toEqual() for deep array comparison
Implements length checks for move sequence validation
Tests both positive and negative scenarios

Technical Details

Testing Framework: Jest
Test Type: Unit Tests
Key Methods: expect(), toBe(), toEqual()
Data Structures: Arrays for move coordinates
Input Parameters: Board size (number)

Best Practices Demonstrated

The test suite demonstrates excellent testing practices by providing clear test cases with specific expectations and comprehensive validation.

Descriptive test case naming
Complete path validation
Edge case handling
Precise coordinate checking
Organized test structure

trekhleb/javascript-algorithms

src/algorithms/uncategorized/knight-tour/__test__/knightTour.test.js

            
import knightTour from '../knightTour';

describe('knightTour', () => {
  it('should not find solution on 3x3 board', () => {
    const moves = knightTour(3);

    expect(moves.length).toBe(0);
  });

  it('should find one solution to do knight tour on 5x5 board', () => {
    const moves = knightTour(5);

    expect(moves.length).toBe(25);

    expect(moves).toEqual([
      [0, 0],
      [1, 2],
      [2, 0],
      [0, 1],
      [1, 3],
      [3, 4],
      [2, 2],
      [4, 1],
      [3, 3],
      [1, 4],
      [0, 2],
      [1, 0],
      [3, 1],
      [4, 3],
      [2, 4],
      [0, 3],
      [1, 1],
      [3, 0],
      [4, 2],
      [2, 1],
      [4, 0],
      [3, 2],
      [4, 4],
      [2, 3],
      [0, 4],
    ]);
  });
});