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Testing Pascal's Triangle Coefficient Generation in javascript-algorithms

This test suite validates the Pascal’s Triangle coefficient generation algorithm implementation in JavaScript. The tests verify correct coefficient calculation for different row numbers, ensuring mathematical accuracy and sequence generation.

Test Coverage Overview

The test suite provides comprehensive coverage of Pascal’s Triangle coefficient generation.

Key areas tested include:

Base case validation (row 0)
Sequential row coefficient generation (rows 1-7)
Symmetrical pattern verification
Numerical accuracy of coefficients

Implementation Analysis

The testing approach utilizes Jest’s expect assertions to verify coefficient arrays. The implementation follows a systematic pattern of testing increasing triangle rows, using toEqual() matcher for precise array comparison.

Framework features leveraged:

Jest’s describe/it block structure
Array equality testing
Multiple test cases in single it block

Technical Details

Testing infrastructure includes:

Jest testing framework
ES6 module import syntax
Array-based assertions
Single describe block architecture
Inline test case definition

Best Practices Demonstrated

The test suite exhibits several quality testing practices.

Notable approaches include:

Progressive complexity testing
Comprehensive edge case coverage
Clear test case organization
Consistent assertion structure
Mathematical sequence validation

trekhleb/javascript-algorithms

src/algorithms/math/pascal-triangle/__test__/pascalTriangle.test.js

            
import pascalTriangle from '../pascalTriangle';

describe('pascalTriangle', () => {
  it('should calculate Pascal Triangle coefficients for specific line number', () => {
    expect(pascalTriangle(0)).toEqual([1]);
    expect(pascalTriangle(1)).toEqual([1, 1]);
    expect(pascalTriangle(2)).toEqual([1, 2, 1]);
    expect(pascalTriangle(3)).toEqual([1, 3, 3, 1]);
    expect(pascalTriangle(4)).toEqual([1, 4, 6, 4, 1]);
    expect(pascalTriangle(5)).toEqual([1, 5, 10, 10, 5, 1]);
    expect(pascalTriangle(6)).toEqual([1, 6, 15, 20, 15, 6, 1]);
    expect(pascalTriangle(7)).toEqual([1, 7, 21, 35, 35, 21, 7, 1]);
  });
});