NUXT.JS Injected Plugin Test

I have created an inject plugin something similar to the one below in Nuxt.js. I need to write test cases for the same using Jest. How do I access the injected function 'accountBalance' in jest spec file?

export default ({ store }, inject) => {
    inject('accountBalance', () => {
        const accountType = acc => getAccountType(acc, store);

        const func2 = acc => getfun(acc, store, true);

        return { accountType, func2 };
    });
};