function validateFocus(input, message) {
		expect(document.activeElement).to.equalNode(input, message);
		expect(input.selectionStart).to.equal(2);
		expect(input.selectionEnd).to.equal(5);
	}
Validate an input tag has maintained focus
@param {HTMLInputElement} input The input to validate
@param {string} [message] Message to show if the activeElement is not
equal to the `input` parameter