Syncs the vue test utils helpers

spec/frontend/helpers/vue_test_utils_helper.js

-/* eslint-disable import/prefer-default-export */
-
 const vNodeContainsText = (vnode, text) =>
   (vnode.text && vnode.text.includes(text)) ||
   (vnode.children && vnode.children.filter(child => vNodeContainsText(child, text)).length);
@@ -19,3 +17,19 @@ 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();
+      }
+    });
+  });

spec/javascripts/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();
-      }
-    });
-  });
+// No new code should be added to this file. Instead, modify the
+// file this one re-exports from. For more detail about why, see:
+// https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31349
+export * from '../../frontend/helpers/vue_test_utils_helper';