themes/material/__mocks__/gatsby-theme-advanced.js
const GatsbyThemeAdvanced = jest.requireActual("gatsby-theme-advanced");
jest.mock("gatsby-theme-advanced/src/config/useConfig", () => {
const configFixture = jest.requireActual("../test/fixtures/config").default;
return jest.fn().mockReturnValue(configFixture);
});
module.exports = {
...GatsbyThemeAdvanced,
};