Snippet

Composable Reactive Lifecycle Verification Using Synthetic Mount Contexts

Vue composables that rely on lifecycle hooks like `onMounted` or `onUnmounted` require an active component instance during execution. Wrapping composable calls inside a synthetic inline component shell allows comprehensive unit testing of cleanup side effects.

snippet.js

javascript

import { mount } from '@vue/test-utils';
 
function mountComposable(composableFn) {
  let result;
  const TestComponent = {
    setup() {
      result = composableFn();
      return () => null;
    }
  };
  const wrapper = mount(TestComponent);
  return { result, unmount: () => wrapper.unmount() };
}
 
export { mountComposable };

vue

Breakdown

setup() {

Executes the target composable within an active Vue component setup context.

return () => null;

Returns an empty render function avoiding overhead while maintaining valid component semantics.

return { result, unmount: () => wrapper.unmount() };

Exposes the composable return values and a trigger to exercise onUnmounted cleanup hooks.

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Composable Reactive Lifecycle Verification Using Synthetic Mount Contexts

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