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Testing Grid Path Calculations in javascript-algorithms

This test suite validates the uniquePaths algorithm implementation which calculates the number of possible unique paths through a grid matrix. The tests verify path calculations for various grid dimensions, ensuring the algorithm correctly handles both small and large matrices.

Test Coverage Overview

The test coverage focuses on validating the uniquePaths function across different grid dimensions and scenarios.

Tests various grid sizes from small (3×2) to large (100×1)
Verifies symmetrical path counts (3×7 vs 7×3)
Validates edge cases with single-row and single-column grids
Ensures accurate calculation for large square grids (10×10)

Implementation Analysis

The testing approach employs Jest’s describe/it pattern for structured test organization. Multiple test cases are grouped within a single test block using expect().toBe() assertions to verify exact numeric outputs.

Uses Jest’s equality matcher for precise numeric comparison
Implements multiple test cases within single test block for efficiency
Follows AAA (Arrange-Act-Assert) pattern implicitly

Technical Details

Testing Framework: Jest
Test Type: Unit test
File Organization: Separate test file in __test__ directory
Import Strategy: Direct module import
Assertion Style: Expect API with toBe matcher

Best Practices Demonstrated

The test suite demonstrates clean and efficient testing practices for algorithmic validation.

Comprehensive test cases covering various scenarios
Clear and concise test descriptions
Efficient test organization with multiple assertions
Proper separation of test and implementation code
Meaningful test case selection with edge cases

trekhleb/javascript-algorithms

src/algorithms/uncategorized/unique-paths/__test__/uniquePaths.test.js

            
import uniquePaths from '../uniquePaths';

describe('uniquePaths', () => {
  it('should find the number of unique paths on board', () => {
    expect(uniquePaths(3, 2)).toBe(3);
    expect(uniquePaths(7, 3)).toBe(28);
    expect(uniquePaths(3, 7)).toBe(28);
    expect(uniquePaths(10, 10)).toBe(48620);
    expect(uniquePaths(100, 1)).toBe(1);
    expect(uniquePaths(1, 100)).toBe(1);
  });
});