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Testing Fibonacci Sequence Calculations in javascript-algorithms

This test suite validates the fibonacciNth function implementation, ensuring accurate calculation of Fibonacci sequence numbers at specific positions. The tests cover a comprehensive range of inputs from the 1st to 75th Fibonacci numbers, verifying both small and large sequence values.

Test Coverage Overview

The test suite provides extensive coverage of the Fibonacci sequence calculation functionality.

Key areas tested include:

Initial sequence values (1st through 8th positions)
Mid-range values (20th and 30th positions)
Large sequence numbers (50th through 75th positions)
Edge cases validation for sequence continuity

Implementation Analysis

The testing approach utilizes Jest’s describe/it pattern for structured test organization. Each test case employs the expect().toBe() matcher to verify exact numerical equality, ensuring precise validation of Fibonacci calculations. The sequential nature of test cases helps identify any potential computation errors across the sequence range.

Technical Details

Testing environment components:

Jest testing framework
ES6 module import system
Number type handling for large integers
Single test suite with multiple assertions
Direct function import for unit testing isolation

Best Practices Demonstrated

The test implementation showcases several testing best practices.

Notable aspects include:

Progressive complexity testing from simple to complex cases
Comprehensive validation of sequence correctness
Clear test case organization
Efficient test structure with multiple assertions
Isolated function testing

trekhleb/javascript-algorithms

src/algorithms/math/fibonacci/__test__/fibonacciNth.test.js

            
import fibonacciNth from '../fibonacciNth';

describe('fibonacciNth', () => {
  it('should calculate fibonacci correctly', () => {
    expect(fibonacciNth(1)).toBe(1);
    expect(fibonacciNth(2)).toBe(1);
    expect(fibonacciNth(3)).toBe(2);
    expect(fibonacciNth(4)).toBe(3);
    expect(fibonacciNth(5)).toBe(5);
    expect(fibonacciNth(6)).toBe(8);
    expect(fibonacciNth(7)).toBe(13);
    expect(fibonacciNth(8)).toBe(21);
    expect(fibonacciNth(20)).toBe(6765);
    expect(fibonacciNth(30)).toBe(832040);
    expect(fibonacciNth(50)).toBe(12586269025);
    expect(fibonacciNth(70)).toBe(190392490709135);
    expect(fibonacciNth(71)).toBe(308061521170129);
    expect(fibonacciNth(72)).toBe(498454011879264);
    expect(fibonacciNth(73)).toBe(806515533049393);
    expect(fibonacciNth(74)).toBe(1304969544928657);
    expect(fibonacciNth(75)).toBe(2111485077978050);
  });
});