How to resolve this "at Object.<anonymous> " error in jest.js - jestjs

Question

I have lots of global objects and say a function which is to be tested but when I run npm test i get
at Object. (index.js:2:1)
at Object. (index.test.js:1:1)
this error
this error points at the object "." of gblob.aobj={};
for simplicity sake i have created a index.js and index.test.js file ,im new to jest.js
note: im working on SPA: single page application where this variable is created in another js
index.js
gblob.aobj={};
function sum(a, b) {
return a + b;
}
module.exports = sum;
"""
"""
index.test.js
const sum = require('./index');
test('adds 1 + 2 to equal 3', () => {
expect(a.hy()).toBe(3);
});
"""
"""
package.json if i need to add something here
{
"name": "my-app",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"test": "jest"
},
" author": "",
"license": "ISC",
"devDependencies": {
"jest": "^24.7.1"
}
}
"""

Answer 1

If I understand your question correctly you are saying your test is failing because the global gblob doesn't exist when index.js runs.
You can fix that by creating a global gblob using the Node's global.
If you create global.gblob at the beginning of your test then it will be available when your code runs:
index.test.js
global.gblob = {}; // <= create the global "gblob"
const sum = require('./index'); // <= now require index.js
test('adds 1 + 2 to equal 3', () => {
// ...
});