Exploring different methods for mocking and testing the Vue $parents property using vue-test-utils

I have encountered an issue while testing a Vue component that relies on accessing this.$parent.$props.

For example:

export default class item extends Vue {
  private point = this.$parent.$props.point;
}

The error I am experiencing is:

TypeError: Cannot read property 'point' of undefined

I have attempted to use mounting options and parentComponent in my test, but I keep receiving the error message "[vue-test-utils]: options.parentComponent should be a valid Vue component options object".

This is the code snippet I have used for testing purposes:

import Parent from "@/components/Parent.vue";

let wrapper: any;
describe("item.vue", () => {
  it("item vue testing", () => {
    wrapper = mount(item, {
        propsData: {
            num: 1,
        },
        parentComponent: Parent
      });

  });
});

How can I effectively mock this.$parent.$props in my component? And what could be the mistake in the above test code?

Answer №1

It's possible to imitate behavior in that manner

    describe("item.vue", () => {
      it("unit testing for item.vue", () => {
        wrapper = mount(item, {
            propsData: {
                num: 1,
            },
            parentComponent: Parent
          });
    
        
        //using functions
        wrapper.vm.$parent= jest.fn().mockResolvedValue("return")
        //or property
        wrapper.vm.$parent.$props.point = "value"
      });
    });

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