Accept argument of different types in the getInstance method (#34333)

js/tests/unit/base-component.spec.js

@@ -104,6 +104,20 @@ describe('Base Component', () => {
         expect(DummyClass.getInstance(element)).toBeInstanceOf(DummyClass)
       })
 
+      it('should accept element, either passed as a CSS selector, jQuery element, or DOM element', () => {
+        createInstance()
+
+        expect(DummyClass.getInstance('#foo')).toEqual(instance)
+        expect(DummyClass.getInstance(element)).toEqual(instance)
+
+        const fakejQueryObject = {
+          0: element,
+          jquery: 'foo'
+        }
+
+        expect(DummyClass.getInstance(fakejQueryObject)).toEqual(instance)
+      })
+
       it('should return null when there is no instance', () => {
         fixtureEl.innerHTML = '<div></div>'