matchers/selection_matchers.go
func HaveAttribute(attribute string, value string) types.GomegaMatcher {
	return &internal.HaveAttributeMatcher{ExpectedAttribute: attribute, ExpectedValue: value}
}
func HaveAttribute(attribute string, value string) types.GomegaMatcher {
	return &internal.HaveAttributeMatcher{ExpectedAttribute: attribute, ExpectedValue: value}
}
// HaveAttribute passes when the expected attribute and value are present on the element.
// This matcher will fail if the provided selection refers to more than one element.