JEST - Highlighting the presence of asynchronous methods with yellow lines on the coverage report

Experiencing an issue on Vue JS, specifically with a method within a component: https://i.sstatic.net/yAjr0.png

The method loadProducts is async, and running JEST tests reveals that line 320 is not covered, despite all other lines and code within the function being covered.

When attempting to await and evaluate the function, the result returned is from lines 339 and 343:

const {success} = await wrapper.vm.loadProducts();

A simplified test case that has been created:

describe('loadProducts', () => {
  it('should return false', async () => {
    const {success} = await wrapper.vm.loadProducts();

    expect(success).toEqual(false);
  });
);

Looking for advice on how to address the coverage report warning being displayed?

Answer №1

My suggestion would be to render the component that uses the function in question and ensure that the function is being called. It may be triggered by a button click, so simulate that action in your test.

If you need more information, you can refer to the coverage report located at

./coverage/lcov-report/index.html
. This report may provide additional insights.

Also, please note that in your code, the then statement returns success in PascalCase while the catch statement returns in lowercase.

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