Add hasTag() assertion

If I didn’t missed something, qunit-dom does not provide yet any assertion for the tagName of an element. Something like this:

assert.equal(document.querySelector('[data-test-foo']).tagName, 'P', 'is a paragraph');

I’m not opinionated on the concrete naming but something like this would be a nice addition to the API:

assert.dom('[data-test-foo']).hasTag('p');

As shown in the example I would recommend that the check is done case-insensitive.

[Turbo87]

@esantelises sorry for the delay. https://github.com/simplabs/qunit-dom/releases/tag/v0.9.1 is out now.

[esantelises]

thank you @Turbo87