test(testFunctions): display stringified arguments in error message (#2442)

Author: pano9000

test/testFunctions.js

@@ -2,6 +2,10 @@ import assert from 'assert';
 import { format } from 'util';
 import validator from '../src/index';
 
+function stringifyArgs(argsArr) {
+  return argsArr.map(arg => JSON.stringify(arg)).join(', ');
+}
+
 export default function test(options) {
   const args = options.args || [];
 
@@ -16,7 +20,7 @@ export default function test(options) {
       } catch (err) {
         const warning = format(
           'validator.%s(%s) passed but should error',
-          options.validator, args.join(', ')
+          options.validator, stringifyArgs(args)
         );
 
         throw new Error(warning);
@@ -31,7 +35,7 @@ export default function test(options) {
       if (validator[options.validator](...args) !== true) {
         const warning = format(
           'validator.%s(%s) failed but should have passed',
-          options.validator, args.join(', ')
+          options.validator, stringifyArgs(args)
         );
 
         throw new Error(warning);
@@ -46,7 +50,7 @@ export default function test(options) {
       if (validator[options.validator](...args) !== false) {
         const warning = format(
           'validator.%s(%s) passed but should have failed',
-          options.validator, args.join(', ')
+          options.validator, stringifyArgs(args)
         );
 
         throw new Error(warning);