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Testing Grid Path Calculation Algorithm in javascript-algorithms

This test suite validates the btUniquePaths algorithm implementation for calculating unique paths on a grid board. It verifies the algorithm’s ability to determine the number of possible paths from the top-left to bottom-right corner of an m×n grid, moving only right and down.

Test Coverage Overview

The test suite provides comprehensive coverage of the btUniquePaths function across various grid dimensions.

Key test cases include:

Small grids (3×2)
Medium-sized grids (7×3)
Symmetric cases (comparing m×n vs n×m)
Large grids (10×10)
Edge cases with single-row/column (100×1, 1×100)

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern for organized test structure. The implementation focuses on input-output validation using expect().toBe() assertions to verify exact numeric results. The tests demonstrate symmetrical property verification where grids of m×n should yield identical results to n×m configurations.

Technical Details

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

describe() for test suite organization
it() for individual test cases
expect().toBe() for strict equality assertions

Best Practices Demonstrated

The test suite exhibits several testing best practices including comprehensive edge case coverage, symmetry validation, and scalability testing with varying grid sizes. The code organization follows clear naming conventions and maintains focused test cases with specific assertions for each scenario.

trekhleb/javascript-algorithms

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

            
import btUniquePaths from '../btUniquePaths';

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