Add more test helpers

[sir-dunxalot]

#114 introduces public test helpers for asserting that a tooltip is shown and hidden.

We should also provide test helpers for:

• Asserting tooltip content matches a string (Spike on assertContent test helper #146)
• Asserting a tooltip is positioned correctly on a given element's side (Position test helper #143)
• Asserting a tooltip is a given number of pixels from the target on a given side (Spacing test helper #145)

[ryanlabouve]

Great work on the test helpers! Started using them today in a large app.

I'd be happy to help with "Asserting tooltip content matches a string". Or if you already have it in the works, no big deal! Great addon. Just trying to give back.

I do this right now (via page objects) by grabbing the tooltip selector from the target, and then checking the content with the selector. I could change this to be a vanilla test helper and PR if it would be useful?

// just example of how we are grabbing the selector
tooltipSelector() {
  let parentScope = this.__parentTreeNode.scope;
  let localScope = this.scope;
  let tooltipTargetSelector = [parentScope, localScope].join(' ');
  let tooltipId = $(tooltipTargetSelector).attr('aria-describedby');
  let tooltipSelector = `#${tooltipId}[role='tooltip']`;
  return tooltipSelector;
}

[a15n]

that would be amazing Ryan. Thank you! As far as I know no one has started working on "Asserting tooltip content matches a string".

[sir-dunxalot]

I am working on the position test helper on this branch but I am not working on the content test helper.

[sir-dunxalot]

@ryanlabouve Let me know if you're not planning on working on the content assertion helper - I can pick it up.

[ryanlabouve]

I'll get a branch up tonight! Sorry for the delay.

[sir-dunxalot]

No sweat! Just checking :)

[sir-dunxalot]

All test helpers have been added. Great work everyone who contributed!