Back to Repositories

Testing Cartesian Product Set Operations in javascript-algorithms

This test suite validates the cartesian product algorithm implementation in JavaScript, focusing on set operations and combinations. The tests verify both valid calculations and edge cases for generating cartesian products between two sets.

Test Coverage Overview

The test suite provides comprehensive coverage of the cartesian product functionality:

Validates null/empty input handling
Tests basic single-element set products
Verifies multi-element set combinations
Covers edge cases with invalid inputs

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern for structured test organization. The implementation employs expect assertions to validate both null responses for invalid inputs and array equality for successful calculations.

Uses Jest’s toBeNull() for invalid cases
Implements toEqual() for array comparison
Follows AAA (Arrange-Act-Assert) pattern

Technical Details

Testing Framework: Jest
Test Type: Unit Tests
File Structure: Separate test file in __test__ directory
Import Style: ES6 module imports
Assertion Methods: toBeNull(), toEqual()

Best Practices Demonstrated

The test suite exemplifies several testing best practices including clear test case separation, descriptive test names, and proper error handling validation.

Isolated test cases
Descriptive test scenarios
Edge case coverage
Consistent assertion patterns

trekhleb/javascript-algorithms

src/algorithms/sets/cartesian-product/__test__/cartesianProduct.test.js

            
import cartesianProduct from '../cartesianProduct';

describe('cartesianProduct', () => {
  it('should return null if there is not enough info for calculation', () => {
    const product1 = cartesianProduct([1], null);
    const product2 = cartesianProduct([], null);

    expect(product1).toBeNull();
    expect(product2).toBeNull();
  });

  it('should calculate the product of two sets', () => {
    const product1 = cartesianProduct([1], [1]);
    const product2 = cartesianProduct([1, 2], [3, 5]);

    expect(product1).toEqual([[1, 1]]);
    expect(product2).toEqual([[1, 3], [1, 5], [2, 3], [2, 5]]);
  });
});