Update FooterItem unit test

tests/unit/FooterItem.spec.ts

@@ -0,0 +1,9 @@
+import { shallowMount } from '@vue/test-utils';
+import FooterItem from '@/components/FooterItem.vue';
+
+describe('FooterItem.vue', () => {
+  it('renders slots when passed', () => {
+    const wrapper = shallowMount(FooterItem);
+    expect(wrapper.html()).toContain('Wavelovers');
+  });
+});