Port tests for (element) from ember-element-helper #1747
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Polyfill: https://github.com/tildeio/ember-element-helper
RFC: https://github.com/emberjs/rfcs/blob/master/text/0389-dynamic-tag-names.md
The RFC is actually underspecified -- but it kinda says "the polyfill is the specification", so we copy the tests from that.