import { describe, expect, it } from 'vitest';
import { DashboardCountFormatter } from './DashboardCountFormatter';

describe('DashboardCountDisplay', () => {
  describe('happy paths', () => {
    it('should format positive numbers correctly', () => {
      expect(DashboardCountFormatter.format(0)).toBe('0');
      expect(DashboardCountFormatter.format(1)).toBe('1');
      expect(DashboardCountFormatter.format(100)).toBe('100');
      expect(DashboardCountFormatter.format(1000)).toBe('1000');
    });

    it('should handle null values', () => {
      expect(DashboardCountFormatter.format(null)).toBe('0');
    });

    it('should handle undefined values', () => {
      expect(DashboardCountFormatter.format(undefined)).toBe('0');
    });
  });

  describe('edge cases', () => {
    it('should handle negative numbers', () => {
      expect(DashboardCountFormatter.format(-1)).toBe('-1');
      expect(DashboardCountFormatter.format(-100)).toBe('-100');
    });

    it('should handle large numbers', () => {
      expect(DashboardCountFormatter.format(999999)).toBe('999999');
      expect(DashboardCountFormatter.format(1000000)).toBe('1000000');
    });

    it('should handle decimal numbers', () => {
      expect(DashboardCountFormatter.format(1.5)).toBe('1.5');
      expect(DashboardCountFormatter.format(100.99)).toBe('100.99');
    });
  });
});