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have_tag() without Rails' assert_select()
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= rspec_hpricot_matchers

An implementation of have_tag(), as in rspec_on_rails, but sitting atop
Nokogiri rather than merely wrapping assert_select().

So at one point it was on Hpricot. But it's not now. Misnomers are more
fun. You're probably better off using something like Webrat::Matchers

== Installation

To use rspec_hpricot_matchers in your project, install the gem, and
add the following to your spec_helper.rb file:

  require 'rspec_hpricot_matchers'
  Spec::Runner.configure do |config|

Similarly, to make the matchers available to stories, you can add the
following to your stories/helper.rb file:

  require 'rspec_hpricot_matchers'
  include RspecHpricotMatchers

== Usage

As its first argument, have_tag() accepts any CSS or XPath selectors
which are supported by Hpricot.

    body.should have_tag('form[@action*=session]')
    body.should have_tag('ul > li + li')

Expectations can be placed upon the inner text of the matched element
by providing another argument, which should be either a String or a

    body.should have_tag('h1', 'Welcome')
    body.should have_tag('p', /a very important blurb/i)

Expectations can be placed upon the number of matched elements by
passing an options hash:

    body.should have_tag('abbr', :count => 1)   # exactly one
    body.should have_tag('dt',   :minimum => 4) # at least 4
    body.should have_tag('dd',   :maximum => 4) # at most 4
    body.should have_tag('a.outgoing', /rspec/i, :count => 2)

The :count key also accepts a Range, making the following equivalent:

    body.should have_tag('tr',   :count => 3..5)
    body.should have_tag('tr',   :minimum => 3,
                                 :maximum => 5)

The usage of with_tag(), however, is no longer supported. Instead, a
block passed to have_tag() will have each matched element successively
yielded to it. If none of the blocks return without raising an
ExpectationNotMetError, the outer have_tag() is treated as having failed:

    body.should have_tag('thead') do |thead|
      thead.should have_tag('th', :count => 5)

This also allows arbitrary expectations to be applied from within
the block, such as:

    body.should have_tag('dl dd.sha1') do |dd|
      dd.inner_text.length.should == 40

== Notes

Currently, this implementation does not support substitution values
as assert_select did (by way of HTML::Selector):

    # Not yet supported:
    body.should have_tag('li[class=?]', dom_class)
    body.should have_tag('tr.person#?', /^person-\d+$/)

I personally rarely use these, and Hpricot's advanced selectors make
them mostly useless, as far as I can tell, so I am unlikely to
implement them myself.

This have_tag() further differs from the assert_select-based
implementation in that the nested have_tag() calls must *all* pass
on a single selected element in order to be true. This was a source
of confusion in RSpec ticket #316. There is a spec covering this
case if you need an example.
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