chore: tests

test/system.spec.ts

@@ -1,6 +1,6 @@
 import validator from 'validator';
 import { afterEach, describe, expect, it } from 'vitest';
-import { faker } from '../src';
+import { faker, FakerError } from '../src';
 
 const seededRuns = [
   {
@@ -251,19 +251,25 @@ describe('system', () => {
         });
 
         it('should not have extension when ext=0', () => {
-          const filePath = faker.system.filePath(0);
+          const filePath = faker.system.filePath({ ext: 0 });
           const file = filePath.split('/').pop();
 
           expect(file.includes('.')).toBeFalsy();
         });
 
         it('should have multiple extension when ext > 1', () => {
           const ext = 3;
-          const filePath = faker.system.filePath(ext);
+          const filePath = faker.system.filePath({ ext });
           const file = filePath.split('/').pop();
 
           expect(file.split('.').length).toBe(ext + 1);
         });
+
+        it('should throw error ext < 0', () => {
+          expect(() => faker.system.filePath({ ext: -1 })).toThrow(
+            new FakerError('Options.ext shall not have negative value')
+          );
+        });
       });
 
       describe('mimeType()', () => {