analyzing properties through unit testing

Currently in the process of writing unit tests for computed properties.

I have a file called fileOne.ts :

export const fileOne = () => {
   
   const fx1 = computed ( () => { ... } );
   const fx2 = computed ( () => { ... } );
   const fx3 = computed ( () => { ... } );

}

This 'fileOne' is also used in a Vue.vue file :

<template>
   ...
</template>

<script lang="ts">
   import { fileOne } from './fileOne';
   
   const fileOneState = fileOne( ... );

   ...
</script>

The goal is to test the computed properties of fileOne. I have a file called 'fileOne.spec.ts' with:

describe('testing computed properties', () => {
  it('should return the correct value', () => {
    expect().toBe();
  })
});

The challenge is: I am unsure of what to import or how to access an instance with the computed properties for testing.

I know this may be a bit unclear, but any assistance would be greatly appreciated.

Thank you

Answer №1

It is most likely unnecessary to test the computed value itself. Instead, consider extracting the methods that are passed as arguments to computed and focus your testing on those.

Unit testing should concentrate on your own business logic rather than testing the computed versions.

One approach is to:

  • Extract the methods to a new file and import them into both fileOne.ts and fileOne.spec.ts, or
  • Export them from fileOne.ts and import them into fileOne.spec.ts.

I recommend option 1 because it clearly indicates that you are exporting custom business logic, with its inclusion in a computed method being a secondary detail. This allows you to import it anywhere as needed.

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