test: make MJS signature test location independent

mjava-minglei/src/test/js/mjs-sign.test.js

@@ -1,8 +1,9 @@
 const fs = require('fs');
+const path = require('path');
 const vm = require('vm');
 const assert = require('assert');
 
-const libraryPath = 'src/main/resources/static/mjs/mjs.min.js';
+const libraryPath = path.resolve(__dirname, '../../main/resources/static/mjs/mjs.min.js');
 const source = fs.readFileSync(libraryPath, 'utf8');
 const signatureModule = source.slice(source.indexOf('// ZTNA signature helper'));
 const sandbox = { mjs: {} };