gitlab-org--gitlab-foss/spec/frontend/helpers/vue_test_utils_helper.js

const vNodeContainsText = (vnode, text) =>
  (vnode.text && vnode.text.includes(text)) ||
  (vnode.children && vnode.children.filter(child => vNodeContainsText(child, text)).length);

/**
 * Determines whether a `shallowMount` Wrapper contains text
 * within one of it's slots. This will also work on Wrappers
 * acquired with `find()`, but only if it's parent Wrapper
 * was shallowMounted.
 * NOTE: Prefer checking the rendered output of a component
 * wherever possible using something like `text()` instead.
 * @param {Wrapper} shallowWrapper - Vue test utils wrapper (shallowMounted)
 * @param {String} slotName
 * @param {String} text
 */
export const shallowWrapperContainsSlotText = (shallowWrapper, slotName, text) =>
  Boolean(
    shallowWrapper.vm.$slots[slotName].filter(vnode => vNodeContainsText(vnode, text)).length,
  );

/**
 * Returns a promise that waits for a mutation to be fired before resolving
 * NOTE: There's no reject action here so it will hang if it waits for a mutation that won't happen.
 * @param {Object} store - The Vue store that contains the mutations
 * @param {String} expectedMutationType - The Mutation to wait for
 */
export const waitForMutation = (store, expectedMutationType) =>
  new Promise(resolve => {
    const unsubscribe = store.subscribe(mutation => {
      if (mutation.type === expectedMutationType) {
        unsubscribe();
        resolve();
      }
    });
  });