fix(core): update

test/test.base64.both.ts

@@ -3,14 +3,21 @@ import { tap, expect } from '@pushrocks/tapbundle';
 
 // Base64
 let testBase64: smartstring.Base64;
+
 tap.test('expect create a valid instance of Base64', async () => {
   testBase64 = new smartstring.Base64('somestring', 'string');
   expect(testBase64).toBeInstanceOf(smartstring.Base64);
 });
+
 tap.test('expect read output a file as base64 and base64uri', async () => {
   expect(testBase64.base64String).not.toEqual(testBase64.base64UriString);
   let testBase64_2 = new smartstring.Base64(testBase64.base64UriString, 'base64uri');
   expect(testBase64_2.simpleString).toEqual(testBase64.simpleString);
 });
 
+tap.test('should test for a valid base64 token', async () => {
+  const result = smartstring.base64.isBase64('dGVzdA==');
+  expect(result).toBeTrue();
+});
+
 tap.start();