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Testing Greedy Jump Game Algorithm Implementation in javascript-algorithms

This test suite evaluates the greedy implementation of the Jump Game algorithm, verifying whether it’s possible to reach the last element in an array by jumping forward based on the values at each position. The tests cover both successful and unsuccessful jump scenarios using a comprehensive set of test cases.

Test Coverage Overview

The test suite provides extensive coverage of the greedyJumpGame function with diverse array inputs.

Key test scenarios include:

Simple two-element arrays with valid jumps
Arrays with multiple possible jump paths
Sequences requiring optimal jump choices
Edge cases with impossible jump sequences
Arrays with varying lengths and jump patterns

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, testing both true and false scenarios systematically. The test structure follows a clear pattern of validating successful jumps followed by impossible jump scenarios.

Framework-specific features utilized include:

Jest’s describe blocks for test organization
Individual test cases using it()
Boolean assertions with toBe()

Technical Details

Testing infrastructure includes:

Jest testing framework
ES6 module imports
Boolean assertion patterns
Unit test isolation
Standalone test file structure

Best Practices Demonstrated

The test suite exemplifies several testing best practices including comprehensive edge case coverage, clear test case organization, and systematic validation of both positive and negative scenarios. The code demonstrates:

Logical grouping of related test cases
Clear test descriptions
Comprehensive boundary testing
Consistent assertion patterns

trekhleb/javascript-algorithms

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

            
import greedyJumpGame from '../greedyJumpGame';

describe('greedyJumpGame', () => {
  it('should solve Jump Game problem in greedy manner', () => {
    expect(greedyJumpGame([1, 0])).toBe(true);
    expect(greedyJumpGame([100, 0])).toBe(true);
    expect(greedyJumpGame([2, 3, 1, 1, 4])).toBe(true);
    expect(greedyJumpGame([1, 1, 1, 1, 1])).toBe(true);
    expect(greedyJumpGame([1, 1, 1, 10, 1])).toBe(true);
    expect(greedyJumpGame([1, 5, 2, 1, 0, 2, 0])).toBe(true);

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