CurrentPageReference setter not getting called when I mock in jest unit test for lwc

Question

referencing this answer:Mocking CurrentPageReference wire in Jest unit tests - LWC

This is how I mock CurrentPageReference in the test file , the navigate functionality seem to work but I can't call the setter for the currentPageReference in the actual component.

This is what my test looks like:

import {CurrentPageReference} from 'lightning/navigation';
const currentPageReferenceAdapter = registerTestWireAdapter(CurrentPageReference);

const createOnlineSalesHomePageDynamic = (params = {}) => {
    const element = createElement(
        'runtime_online_sales-online-sales-home-page',
        {is: OnlineSalesHomePage}
    );
    Object.assign(element, params);
    document.body.appendChild(element);
    return element;
};
describe('Product catalog tests in onlineSalesHomePage', () => {
   it('should show expected breadcrumb on contract detail navigation', () => {
        const props = {
            currentPageReferenceAdapter: currentPageReferenceAdapter,
        };
        const element = createOnlineSalesHomePageDynamic(props);

        return Promise.resolve()
            .then(() => {
                // Navigate to Contract Details.. this works!
                currentPageReferenceAdapter.emit(getPageReference(VIEW.CONTRACT_DETAIL, {c__id : contracts[0].contractId}));
            })
            .then(() => {
                const bcElement = element.shadowRoot.querySelector('runtime_online_sales-breadcrumb');
                debugger; // !! bcElement null, since currentPageReference for the actual component is not defined  and that because the setter is never called
            })
    });
});
   

This is the code actual component where the currentPageReference is injected, but this never gets called in the test as I expect it to:

    @wire(CurrentPageReference)
    setCurrentPageReference(currentPageReference) {
        debugger;
    // ! never gets called through the unit test as I expect it to !
    this.currentPageReference = currentPageReference;
    // some other setter code
    }

getPageReference() function:

export function getPageReference(view, state) {
    const pageRef = {
        type: 'standard__navItemPage',
        attributes: {
            apiName: 'standard-OnlineSalesHome',
        },
        state: {}
    };
    if (view !== VIEW.HOME) {
        Object.assign(pageRef.state, {c__view: view});
    }
    if (state) {
        Object.assign(pageRef.state, state);
    }
    return pageRef;
}

Answer 1

Looks like .emit() is the function that calls the setter for the page reference,

In my case emit() was getting called after it was required , fixing that seems to fix the issue