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Testing Dynamic Programming Jump Game Algorithm in javascript-algorithms

This test suite validates the dynamic programming top-down implementation of the Jump Game algorithm. It verifies whether it’s possible to reach the last element in an array by jumping forward based on the values in each position.

Test Coverage Overview

The test suite provides comprehensive coverage of the Jump Game algorithm implementation using various input scenarios.

Key test cases include:

Simple two-element arrays with valid jumps
Arrays with multiple possible jump paths
Arrays with exact sequential jumps
Arrays with impossible jump sequences
Edge cases with zero jumps and maximum value jumps

Implementation Analysis

The testing approach employs Jest’s describe/it pattern to organize test cases logically. The implementation uses expect().toBe() assertions to verify boolean outcomes of the jump possibility calculations.

The test structure demonstrates clear separation of positive and negative test cases, with multiple variations of each to ensure robust algorithm validation.

Technical Details

Testing Framework: Jest
Testing Pattern: Unit Tests
Key Components:

Import of dpTopDownJumpGame function
Boolean assertions using toBe()
Single test block with multiple assertions
Dynamic programming specific test cases

Best Practices Demonstrated

The test suite exhibits several testing best practices including comprehensive edge case coverage and clear test organization.

Notable practices include:

Logical grouping of positive and negative test cases
Variety of input array sizes and patterns
Clear test descriptions
Consistent assertion pattern usage

trekhleb/javascript-algorithms

src/algorithms/uncategorized/jump-game/__test__/dpTopDownJumpGame.test.js

            
import dpTopDownJumpGame from '../dpTopDownJumpGame';

describe('dpTopDownJumpGame', () => {
  it('should solve Jump Game problem in top-down dynamic programming manner', () => {
    expect(dpTopDownJumpGame([1, 0])).toBe(true);
    expect(dpTopDownJumpGame([100, 0])).toBe(true);
    expect(dpTopDownJumpGame([2, 3, 1, 1, 4])).toBe(true);
    expect(dpTopDownJumpGame([1, 1, 1, 1, 1])).toBe(true);
    expect(dpTopDownJumpGame([1, 1, 1, 10, 1])).toBe(true);
    expect(dpTopDownJumpGame([1, 5, 2, 1, 0, 2, 0])).toBe(true);

    expect(dpTopDownJumpGame([1, 0, 1])).toBe(false);
    expect(dpTopDownJumpGame([3, 2, 1, 0, 4])).toBe(false);
    expect(dpTopDownJumpGame([0, 0, 0, 0, 0])).toBe(false);
    expect(dpTopDownJumpGame([5, 4, 3, 2, 1, 0, 0])).toBe(false);
  });
});