Apply maintainer suggestions

Use toMatchObject for succinct testing
Simply pass down autocomplete="off"

app/assets/javascripts/sidebar/components/date/sidebar_date_widget.vue

@@ -287,7 +287,7 @@ export default {
         class="gl-relative"
         :default-date="parsedDate"
         show-clear-button
-        :autocomplete="'off'"
+        autocomplete="off"
         @input="setDate"
         @clear="setDate(null)"
       />

spec/frontend/sidebar/components/date/sidebar_date_widget_spec.js

@@ -120,9 +120,11 @@ describe('Sidebar date Widget', () => {
     });
 
     it('uses a correct prop to set the initial date for GlDatePicker', () => {
-      expect(findDatePicker().props('value')).toBe(null);
-      expect(findDatePicker().props('defaultDate')).toEqual(wrapper.vm.parsedDate);
-      expect(findDatePicker().props('autocomplete')).toEqual('off');
+      expect(findDatePicker().props()).toMatchObject({
+        value: null,
+        autocomplete: 'off',
+        defaultDate: expect.any(Object),
+      });
     });
 
     it('renders GlDatePicker', async () => {