```diff
-expect(ReactTestUtils.isDOMComponent(maybeElement)).toBe(true);
+expect(maybeElement).toBeInstanceOf(Element);
```
It's not equivalent since `isDOMComponent` checks `maybeElement.nodeType
=== Element.ELEMENT_NODE && !!maybeElement.tagName` but `instanceof`
check seems sufficient here. Checking `nodeType` is mostly for
cross-realm checks and checking falsy `tagName` seems like a check
specifically for incomplete DOM implementations because tagName can't be
empty by spec I believe.
Sebastian Silbermann
9c48fb25ec