Library is throwing an uncaught error during jasmine test in node js

I have the following function:

var fs = require('fs');


function Writer(path, content) {
    this.path = path;
    this.content = content;

    this.process = function () {

    fs.writeFile(
        this.path,
        this.content,
        function (error) {
            if (error) {
                throw new Error('Something went wrong during writing');
            }
    }, 'utf-8')

};
}
module.exports = Writer;

With the this test:

it('test if writing fails ', function () {
    var writer = new Writer(
        '/data/configurations/ab/ba/abba/test.json',
        'content'
    );

    expect(function() {
        writer.process()
    }).toThrowError("Something went wrong during writing");
})

So this is expected to fail because there is no file to write. Then the library FS is throwing an Error which is uncaught.
Here is the output from the test:

Started
.....F

Failures:
1) writer test test if writing fails 
  Message:
    Expected function to throw an Error.
  Stack:
    Error: Expected function to throw an Error.
        at Object.<anonymous> (/vagrant/project/tests/utils/file/writerTest.js:42:6)

6 specs, 1 failure
Finished in 0.198 seconds


/vagrant/project/node_modules/mock-fs/lib/binding.js:1060
      throw new FSError('ENOENT', filepath);
Error: ENOENT, no such file or directory '/vagrant/project/node_modules/jasmine/node_modules/exit'
    at Binding.<anonymous> (/vagrant/project/node_modules/mock-fs/lib/binding.js:1060:13)

so the library is throwing and error and the toThrowError doesn't get it. Does someone have an idea how to solve it or what is my mistake?