test breaks when switching import

When I switch the import from "vue-test-utils" to "@vue/test-utils" one of my tests breaks.

wrapper.emitted() resolves to undefined in the latter case, and I get an "TypeError: undefined is not an object" error

Given that:

it works in the former case but not in the latter
the wrapper API has not changed in any relevant ways
the only changes to my code is the import statement it follows that it is something to do with @vue/test-utils itself.

here is the component: `

here is the test: `import Vue from "vue"; import Timeline from "../src/components/Timeline.vue";

import as vtu from "@vue/test-utils"; import as utils from "../../tools/utils"; // -----------------------------------------------------------------------------

/ convenience function for getting a good timeline instance @return a wrapped Timeline mounted with easily testable prop data / function getWrapper1(): any { return vtu.mount(Timeline, { propsData: { inPoint: 2, outPoint: 6, step: 2, displayMarkers: true } } ); }

/ like getWrapper1, but with props that make testing tick and tickStep easy @return a wrapped Timeline mounted with easily testable prop data / function getWrapper2(): any { return vtu.mount(Timeline, { propsData: { inPoint: 0, outPoint: 100, step: 1, displayMarkers: true } } ); } // -----------------------------------------------------------------------------

describe('Timeline', () => { describe("events", () => { const wrapper = getWrapper1();

    it("onMarkerUpdate emits correct events and values", () => {
        wrapper.vm.onMarkerUpdate(["1", "2", "3"]);
        const emitted = wrapper.emitted();
        expect(emitted.inPointChanged[0][0]).toBe(1);
        expect(emitted.playheadChanged[0][0]).toBe(2);
        expect(emitted.outPointChanged[0][0]).toBe(3);
    });
});

}); `

vuejs / vue-test-utils

test breaks when switching import #779