@santi100a/percentage-lib/tests/main.test.ts

Santi's Powerful Percentage Function: Easily find percentages!

// Generated by CodiumAI

import percentage = require('..');

describe('percentage', () => {

    // Returns the correct percentage value for positive input values
    it('should return the correct percentage value when given positive input values', () => {
      expect(percentage(10, 50)).toBe(5);
      expect(percentage(20, 75)).toBe(15);
      expect(percentage(100, 20)).toBe(20);
    });

    // Returns 0 when n or p is 0
    it('should return 0 when n is 0', () => {
      expect(percentage(0, 50)).toBe(0);
      expect(percentage(0, 75)).toBe(0);
      expect(percentage(0, 100)).toBe(0);
    });

    it('should return 0 when p is 0', () => {
      expect(percentage(10, 0)).toBe(0);
      expect(percentage(20, 0)).toBe(0);
      expect(percentage(100, 0)).toBe(0);
    });

    // Returns n when p is 100 and n is any value
    it('should return n when p is 100 and n is any value', () => {
      expect(percentage(10, 100)).toBe(10);
      expect(percentage(20, 100)).toBe(20);
      expect(percentage(100, 100)).toBe(100);
    });

    // Returns the correct negative values when n is negative
    it('should return the correct negative values when n is negative', () => {
      expect(percentage(-10, 50)).toBe(-5);
      expect(percentage(-20, 75)).toBe(-15);
      expect(percentage(-100, 20)).toBe(-20);
    });

    // Throws when p is negative
    it('should throw when p is negative', () => {
      expect(() => percentage(10, -50)).toThrow(/"percentage" must be/);
      expect(() => percentage(20, -75)).toThrow(/"percentage" must be/);
      expect(() => percentage(100, -20)).toThrow(/"percentage" must be/);
    });
});