My quest to get the maximum coverage & diagnostics from the leanest
tests has reached a new level.
This is a Rails functional test on an HTML form:
user = users(:Moses) get :edit_user, :id => user.id assert_xhtml do form :action => '/users' do fieldset do legend 'Personal Information' label 'First name' input :type => 'text', :name => 'user[first_name]' :value => user.first_name end end end
That’s all. The assertion expects a form with a given action, containing
fieldset, a legend, a label, and a populated text input field. The
forgives any other details, such as intervening structural tags, and
if any required detail is missing, out of order, or ill-formed.
You test HTML by writing an example of what you expect, excluding
don’t care about.
When it fails, the assertion will print out your reference HTML, and
HTML from your web page.
The assertion faults if…
- any attribute does not match exactly
- any text content does not match, stripped
- any node is not found at all
- any node is found out of order
The assertion does not fail if
- nodes contain un-specified attributes
- the DOM contains any un-specified tags (, , etc.)
Here’s the assertion checking that a list appears in collating order:
assert_xhtml SAMPLE_LIST do ul :style => 'font-size: 18' do li 'model' do li 'Billings criteria' li 'Billings report' li 'Sales report' end end end
The assertion takes a block that renders into a Nokogiri::HTML::Builder.
HTML it can build, you can specify by example.
That freedom causes two issues: The ‘self’ context is different inside
block, so you must pass variables in as closures. And an element with
name as a Builder method, such as .select, need a bang: .select!
Get the assertion, from assert2-0.3.8.gem, with these incantations:
gem install assert2 nokogiri
require ‘assert2/xhtml’ # for Test::Unit::TestCase and derivatives
Those of you using RSpec will know how to apply this Gist: