test: add tests specifically for isLuhnValid

Author: ST-DDT

test/validators.js

@@ -4931,6 +4931,34 @@ describe('Validators', () => {
     });
   });
 
+  it('should validate luhn numbers', () => {
+    test({
+      validator: 'isLuhnValid',
+      valid: [
+        '0',
+        '5421',
+        '01234567897',
+        '0123456789012345678906',
+        '0123456789012345678901234567891',
+        '123456789012345678906',
+        '375556917985515',
+        '36050234196908',
+        '4716461583322103',
+        '4716-2210-5188-5662',
+        '4929 7226 5379 7141',
+      ],
+      invalid: [
+        '',
+        '1',
+        '5422',
+        'foo',
+        'prefix6234917882863855',
+        '623491788middle2863855',
+        '6234917882863855suffix',
+      ],
+    });
+  });
+
   it('should validate credit cards', () => {
     test({
       validator: 'isCreditCard',