Testing VueJs components with Jest and Typescript: when the components are not mounted

Our team is in the process of developing an application using VueJs. Drawing from our past experience with Angular unit testing utilizing Jasmine and Karma, we have opted to implement Typescript for this VueJs project.

Currently, I have created simple specifications for components; however, it appears that the components are not being mounted as expected.

Below is a snippet of a sample component:

export default class TableOverview extends Vue {
  public mounted() {
    console.log("mounted");
  }
}

And here's my test specification:

describe("table-overview.vue", () => {
  it("should log 'mounted'", () => {
    const wrapper = mount(TableOverview);

    expect(wrapper).toBeDefined();
  });
});

However, nothing seems to be displaying in the console log.

What could possibly be missing? This particular project was initialized using Vue CLI v4.3.1.

Here is some additional Vue information for reference:

  System:
    OS: Windows 10 10.0.18363
    CPU: (8) x64 Intel(R) Core(TM) i7-6820HQ CPU @ 2.70GHz
  Binaries:
    Node: 8.11.3 - C:\Program Files\nodejs\node.EXE
    Yarn: Not Found
    npm: 5.6.0 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: 44.18362.449.0
  npmPackages:
    ...

Answer №1

This might seem trivial, but the issue I encountered was due to Jest caching my test results.

To resolve this, I simply ran the tests with the --no-cache option.

Within the packages.json file:

"test:unit": "vue-cli-service test:unit --no-cache"

For other solutions, you can check out:

How to clear Jest cache?

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