test(finance): improve readability (#2766)

Author: ST-DDT

test/modules/finance.spec.ts

@@ -166,7 +166,7 @@ describe('finance', () => {
         });
 
         it('should set a specified length', () => {
-          const expected = faker.number.int(20) || 4;
+          const expected = faker.number.int({ min: 1, max: 20 });
 
           const mask = faker.finance.maskedNumber({
             length: expected,