Mocking methods

component.test.js

// using jest.fn() to mock action and mutation functions
beforeEach(() => {
    actions = {
        someAction: jest.fn(() => true)
    };
    mutations = {
        someMutation: jest.fn(() => false)
    };
    state = {
        key: {}
    };
    store = new Vuex.Store({
        actions,
        mutations,
        state,
    });

  ...

});

...
  
// using jest.fn() to mock component method or another other global functions
test('clicking search button triggers search()', () => {
    window.open = jest.fn(); // global function mock to stop actual from executing
    wrapper.vm.search = jest.fn();
    const searchBtn = '.search-btn';
    wrapper.find(searchBtn).trigger('click');
    expect(wrapper.vm.search).toBeCalled();
});