Add missing tests elementhandle.spec.ts

[kblok]

elementhandle.spec.ts: ElementHandle.click: should return Point data elementhandle.spec.ts: ElementHandle.click: should not work for TextNodes elementhandle.spec.ts: ElementHandle.clickablePoint: should work elementhandle.spec.ts: ElementHandle.clickablePoint: should work for iframes elementhandle.spec.ts: Element.waitForSelector: should wait correctly with waitForSelector on an element elementhandle.spec.ts: Element.waitForXPath: should wait correctly with waitForXPath on an element elementhandle.spec.ts: ElementHandle.isIntersectingViewport: should work with threshold elementhandle.spec.ts: ElementHandle.isIntersectingViewport: should work with threshold of 1 elementhandle.spec.ts: Custom queries: should register and unregister elementhandle.spec.ts: Custom queries: should work with function shorthands elementhandle.spec.ts: Element.toElement: should work