Fix broken tests

ee/spec/frontend/vulnerabilities/vulnerability_state_dropdown_spec.js

+import { GlDropdown } from '@gitlab/ui';
 import { shallowMount } from '@vue/test-utils';
 import VulnerabilityStateDropdown from 'ee/vulnerabilities/components/vulnerability_state_dropdown.vue';
 import { VULNERABILITY_STATE_OBJECTS } from 'ee/vulnerabilities/constants';
@@ -11,6 +12,9 @@ describe('Vulnerability state dropdown component', () => {
     // Create a dropdown that by default has the first vulnerability state selected.
     wrapper = shallowMount(VulnerabilityStateDropdown, {
       propsData: { initialState },
+      stubs: {
+        GlDropdown,
+      },
     });
 
     // Mock out this function, it's called by some methods in the component.
@@ -136,13 +140,13 @@ describe('Vulnerability state dropdown component', () => {
         });
     });
 
-    it('when the parent component changes the state, the dropdown will update its selected and initial item', () => {
+    it('when the parent component changes the state, the dropdown will update its selected and initial item', async () => {
       const [stateString, stateObject] = vulnerabilityStateEntries[1];
 
       wrapper.setProps({ initialState: stateString }); // Change the state.
 
       return wrapper.vm.$nextTick().then(() => {
-        expect(innerDropdown().attributes('text')).toBe(stateString); // Check that the dropdown button's value matches the initial state.
+        expect(innerDropdown().props('text')).toBe(stateString); // Check that the dropdown button's value matches the initial state.
         expect(selectedItem().text()).toMatch(new RegExp(`^${stateObject.action}`, 'i')); // Check that the selected item is the initial state.
         expect(isDisabled(saveButton())).toBe(true); // Check that the save button is disabled.
       });