Vue test utils: mock getter return value - vue.js

Question

I'm writing a test that mocks the return value of a namespaced getter, which accepts a single argument. The test parameter will be the mocked return value for the getter, which controls the visibility of an element on the page.
Mocking the getter with a generic return value allows it to be defined, but so far mocking the return value with the test parameter is not working.
Getter (in the "app" module):
const getters = {
myGetter:
(state) =>
(getterArg) => {
return state.someStateVariable === true
? valueForTrue
: valueForFalse;
}
};
Test:
import { cloneDeep } from "lodash";
import { createLocalVue, shallowMount } from "#vue/test-utils";
import MyComponent from "#/views/MyComponent.vue";
import { storeConfig } from "#/store";
import Vuex from "vuex";
describe("My test", () => {
let localVue;
let store;
let wrapper;
beforeEach(() => {
localVue = createLocalVue();
localVue.use(Vuex);
});
test.each([[false], [true]])(
"Test param: '%s'",
(testParam) => {
store = new Vuex.Store({
modules: {
app: {
namespaced: true,
...cloneDeep(storeConfig.modules.app),
state: {
...cloneDeep(storeConfig.modules.app.state),
getters: {
...cloneDeep(storeConfig.modules.app.getters),
// getter defined, but doesn't include test param
myGetter: jest.fn().mockReturnValue(jest.fn())
// getter variation with a mocked return value (test fails due to testParam not being returned)
myGetter: jest.fn().mockReturnValue(jest.fn().mockReturnValue(testParam))
// getter variation with the argument passed by the component, and a mocked return value (test fails due to testParam not being returned)
myGetter: jest.fn("getterArg").mockReturnValue(jest.fn().mockReturnValue(testParam))
}
}
}
});
wrapper = shallowMount(MyComponent, {
localVue,
store
});
expect(wrapper.find("#my-element").exists()).toBe(
testParam
);
I also tried updating the wrapper after creation:
// Test fails due to getter being undefined
Object.defineProperty(wrapper.vm, "app/myGetter", {
value: () => {
return testParam;
}
});
// Test fails due to getter being undefined
Object.defineProperty(wrapper.vm, "app/myGetter", {
value: ("getterArg") => {
return testParam;
}
});
How can this namespaced getter be configured to dynamically return the test parameter?