#--
# Copyright (c) 2006 Assaf Arkin (http://labnotes.org)
# Under MIT and/or CC By license.
#++
require 'rexml/document'
require File.dirname(__FILE__) + "/../vendor/html-scanner/html/document"
module ActionController
module Assertions
# Adds the #assert_select method for use in Rails functional
# test cases.
#
# Use #assert_select to make assertions on the response HTML of a controller
# action. You can also call #assert_select within another #assert_select to
# make assertions on elements selected by the enclosing assertion.
#
# Use #css_select to select elements without making an assertions, either
# from the response HTML or elements selected by the enclosing assertion.
#
# In addition to HTML responses, you can make the following assertions:
# * #assert_select_rjs -- Assertions on HTML content of RJS update and
# insertion operations.
# * #assert_select_encoded -- Assertions on HTML encoded inside XML,
# for example for dealing with feed item descriptions.
# * #assert_select_email -- Assertions on the HTML body of an e-mail.
#
# Also see HTML::Selector for learning how to use selectors.
module SelectorAssertions
# :call-seq:
# css_select(selector) => array
# css_select(element, selector) => array
#
# Select and return all matching elements.
#
# If called with a single argument, uses that argument as a selector
# to match all elements of the current page. Returns an empty array
# if no match is found.
#
# If called with two arguments, uses the first argument as the base
# element and the second argument as the selector. Attempts to match the
# base element and any of its children. Returns an empty array if no
# match is found.
#
# The selector may be a CSS selector expression (+String+), an expression
# with substitution values (+Array+) or an HTML::Selector object.
#
# For example:
# forms = css_select("form")
# forms.each do |form|
# inputs = css_select(form, "input")
# ...
# end
def css_select(*args)
# See assert_select to understand what's going on here.
arg = args.shift
if arg.is_a?(HTML::Node)
root = arg
arg = args.shift
elsif arg == nil
raise ArgumentError, "First arugment is either selector or element to select, but nil found. Perhaps you called assert_select with an element that does not exist?"
elsif @selected
matches = []
@selected.each do |selected|
subset = css_select(selected, HTML::Selector.new(arg.dup, args.dup))
subset.each do |match|
matches << match unless matches.any? { |m| m.equal?(match) }
end
end
return matches
else
root = response_from_page_or_rjs
end
case arg
when String
selector = HTML::Selector.new(arg, args)
when Array
selector = HTML::Selector.new(*arg)
when HTML::Selector
selector = arg
else raise ArgumentError, "Expecting a selector as the first argument"
end
selector.select(root)
end
# :call-seq:
# assert_select(selector, equality?, message?)
# assert_select(element, selector, equality?, message?)
#
# An assertion that selects elements and makes one or more equality tests.
#
# If the first argument is an element, selects all matching elements
# starting from (and including) that element and all its children in
# depth-first order.
#
# If no element if specified, calling #assert_select will select from the
# response HTML. Calling #assert_select inside an #assert_select block will
# run the assertion for each element selected by the enclosing assertion.
#
# For example:
# assert_select "ol>li" do |elements|
# elements.each do |element|
# assert_select element, "li"
# end
# end
# Or for short:
# assert_select "ol>li" do
# assert_select "li"
# end
#
# The selector may be a CSS selector expression (+String+), an expression
# with substitution values, or an HTML::Selector object.
#
# === Equality Tests
#
# The equality test may be one of the following:
# * <tt>nil/true</tt> -- Assertion is true if at least one element is
# selected.
# * <tt>String</tt> -- Assertion is true if the text value of all
# selected elements equals to the string.
# * <tt>Regexp</tt> -- Assertion is true if the text value of all
# selected elements matches the regular expression.
# * <tt>false</tt> -- Assertion is true if no element is selected.
# * <tt>Integer</tt> -- Assertion is true if exactly that number of
# elements are selected.
# * <tt>Range</tt> -- Assertion is true if the number of selected
# elements fit the range.
#
# To perform more than one equality tests, use a hash the following keys:
# * <tt>:text</tt> -- Assertion is true if the text value of each
# selected elements equals to the value (+String+ or +Regexp+).
# * <tt>:count</tt> -- Assertion is true if the number of matched elements
# is equal to the value.
# * <tt>:minimum</tt> -- Assertion is true if the number of matched
# elements is at least that value.
# * <tt>:maximum</tt> -- Assertion is true if the number of matched
# elements is at most that value.
#
# If the method is called with a block, once all equality tests are
# evaluated the block is called with an array of all matched elements.
#
# === Examples
#
# # At least one form element
# assert_select "form"
#
# # Form element includes four input fields
# assert_select "form input", 4
#
# # Page title is "Welcome"
# assert_select "title", "Welcome"
#
# # Page title is "Welcome" and there is only one title element
# assert_select "title", {:count=>1, :text=>"Welcome"},
# "Wrong title or more than one title element"
#
# # Page contains no forms
# assert_select "form", false, "This page must contain no forms"
#
# # Test the content and style
# assert_select "body div.header ul.menu"
#
# # Use substitution values
# assert_select "ol>li#?", /item-\d+/
#
# # All input fields in the form have a name
# assert_select "form input" do
# assert_select "[name=?]", /.+/ # Not empty
# end
def assert_select(*args, &block)
# Start with optional element followed by mandatory selector.
arg = args.shift
if arg.is_a?(HTML::Node)
# First argument is a node (tag or text, but also HTML root),
# so we know what we're selecting from.
root = arg
arg = args.shift
elsif arg == nil
# This usually happens when passing a node/element that
# happens to be nil.
raise ArgumentError, "First arugment is either selector or element to select, but nil found. Perhaps you called assert_select with an element that does not exist?"
elsif @selected
root = HTML::Node.new(nil)
root.children.concat @selected
else
# Otherwise just operate on the response document.
root = response_from_page_or_rjs
end
# First or second argument is the selector: string and we pass
# all remaining arguments. Array and we pass the argument. Also
# accepts selector itself.
case arg
when String
selector = HTML::Selector.new(arg, args)
when Array
selector = HTML::Selector.new(*arg)
when HTML::Selector
selector = arg
else raise ArgumentError, "Expecting a selector as the first argument"
end
# Next argument is used for equality tests.
equals = {}
case arg = args.shift
when Hash
equals = arg
when String, Regexp
equals[:text] = arg
when Integer
equals[:count] = arg
when Range
equals[:minimum] = arg.begin
equals[:maximum] = arg.end
when FalseClass
equals[:count] = 0
when NilClass, TrueClass
equals[:minimum] = 1
else raise ArgumentError, "I don't understand what you're trying to match"
end
# If we have a text test, by default we're looking for at least one match.
# Without this statement text tests pass even if nothing is selected.
# Can always override by specifying minimum or count.
if equals[:text]
equals[:minimum] ||= 1
end
# If a count is specified, it takes precedence over minimum/maximum.
if equals[:count]
equals[:minimum] = equals[:maximum] = equals.delete(:count)
end
# Last argument is the message we use if the assertion fails.
message = args.shift
#- message = "No match made with selector #{selector.inspect}" unless message
if args.shift
raise ArgumentError, "Not expecting that last argument, you either have too many arguments, or they're the wrong type"
end
matches = selector.select(root)
# Equality test.
equals.each do |type, value|
case type
when :text
for match in matches
text = ""
stack = match.children.reverse
while node = stack.pop
if node.tag?
stack.concat node.children.reverse
else
text << node.content
end
end
text.strip! unless match.name == "pre"
if value.is_a?(Regexp)
assert text =~ value, build_message(message, <<EOT, value, text)
<?> expected but was
<?>.
EOT
else
assert_equal value.to_s, text, message
end
end
when :html
for match in matches
html = match.children.map(&:to_s).join
html.strip! unless match.name == "pre"
if value.is_a?(Regexp)
assert html =~ value, build_message(message, <<EOT, value, html)
<?> expected but was
<?>.
EOT
else
assert_equal value.to_s, html, message
end
end
when :minimum
assert matches.size >= value, message || "Expecting at least #{value} selected elements, found #{matches.size}"
when :maximum
assert matches.size <= value, message || "Expecting at most #{value} selected elements, found #{matches.size}"
else raise ArgumentError, "I don't support the equality test #{key}"
end
end
# If a block is given call that block. Set @selected to allow
# nested assert_select, which can be nested several levels deep.
if block_given? && !matches.empty?
begin
in_scope, @selected = @selected, matches
yield matches
ensure
@selected = in_scope
end
end
# Returns all matches elements.
matches
end
# :call-seq:
# assert_select_rjs(id?) { |elements| ... }
# assert_select_rjs(statement, id?) { |elements| ... }
# assert_select_rjs(:insert, position, id?) { |elements| ... }
#
# Selects content from the RJS response.
#
# === Narrowing down
#
# With no arguments, asserts that one or more elements are updated or
# inserted by RJS statements.
#
# Use the +id+ argument to narrow down the assertion to only statements
# that update or insert an element with that identifier.
#
# Use the first argument to narrow down assertions to only statements
# of that type. Possible values are +:replace+, +:replace_html+ and
# +:insert_html+.
#
# Use the argument +:insert+ followed by an insertion position to narrow
# down the assertion to only statements that insert elements in that
# position. Possible values are +:top+, +:bottom+, +:before+ and +:after+.
#
# === Using blocks
#
# Without a block, #assert_select_rjs merely asserts that the response
# contains one or more RJS statements that replace or update content.
#
# With a block, #assert_select_rjs also selects all elements used in
# these statements and passes them to the block. Nested assertions are
# supported.
#
# Calling #assert_select_rjs with no arguments and using nested asserts
# asserts that the HTML content is returned by one or more RJS statements.
# Using #assert_select directly makes the same assertion on the content,
# but without distinguishing whether the content is returned in an HTML
# or JavaScript.
#
# === Examples
#
# # Updating the element foo.
# assert_select_rjs :update, "foo"
#
# # Inserting into the element bar, top position.
# assert_select rjs, :insert, :top, "bar"
#
# # Changing the element foo, with an image.
# assert_select_rjs "foo" do
# assert_select "img[src=/images/logo.gif""
# end
#
# # RJS inserts or updates a list with four items.
# assert_select_rjs do
# assert_select "ol>li", 4
# end
#
# # The same, but shorter.
# assert_select "ol>li", 4
def assert_select_rjs(*args, &block)
arg = args.shift
# If the first argument is a symbol, it's the type of RJS statement we're looking
# for (update, replace, insertion, etc). Otherwise, we're looking for just about
# any RJS statement.
if arg.is_a?(Symbol)
if arg == :insert
arg = args.shift
insertion = "insert_#{arg}".to_sym
raise ArgumentError, "Unknown RJS insertion type #{arg}" unless RJS_STATEMENTS[insertion]
statement = "(#{RJS_STATEMENTS[insertion]})"
else
raise ArgumentError, "Unknown RJS statement type #{arg}" unless RJS_STATEMENTS[arg]
statement = "(#{RJS_STATEMENTS[arg]})"
end
arg = args.shift
else
statement = "#{RJS_STATEMENTS[:any]}"
end
# Next argument we're looking for is the element identifier. If missing, we pick
# any element.
if arg.is_a?(String)
id = Regexp.quote(arg)
arg = args.shift
else
id = "[^\"]*"
end
pattern = Regexp.new("#{statement}\\(\"#{id}\", #{RJS_PATTERN_HTML}\\)", Regexp::MULTILINE)
# Duplicate the body since the next step involves destroying it.
matches = nil
@response.body.gsub(pattern) do |match|
html = $2
# RJS encodes double quotes and line breaks.
html.gsub!(/\\"/, "\"")
html.gsub!(/\\n/, "\n")
matches ||= []
matches.concat HTML::Document.new(html).root.children.select { |n| n.tag? }
""
end
if matches
if block_given?
begin
in_scope, @selected = @selected, matches
yield matches
ensure
@selected = in_scope
end
end
matches
else
# RJS statement not found.
flunk args.shift || "No RJS statement that replaces or inserts HTML content."
end
end
# :call-seq:
# assert_select_encoded(element?) { |elements| ... }
#
# Extracts the content of an element, treats it as encoded HTML and runs
# nested assertion on it.
#
# You typically call this method within another assertion to operate on
# all currently selected elements. You can also pass an element or array
# of elements.
#
# The content of each element is un-encoded, and wrapped in the root
# element +encoded+. It then calls the block with all un-encoded elements.
#
# === Example
#
# assert_select_feed :rss, 2.0 do
# # Select description element of each feed item.
# assert_select "channel>item>description" do
# # Run assertions on the encoded elements.
# assert_select_encoded do
# assert_select "p"
# end
# end
# end
def assert_select_encoded(element = nil, &block)
case element
when Array
elements = element
when HTML::Node
elements = [element]
when nil
unless elements = @selected
raise ArgumentError, "First argument is optional, but must be called from a nested assert_select"
end
else
raise ArgumentError, "Argument is optional, and may be node or array of nodes"
end
fix_content = lambda do |node|
# Gets around a bug in the Rails 1.1 HTML parser.
node.content.gsub(/<!\[CDATA\[(.*)(\]\]>)?/m) { CGI.escapeHTML($1) }
end
selected = elements.map do |element|
text = element.children.select{ |c| not c.tag? }.map{ |c| fix_content[c] }.join
root = HTML::Document.new(CGI.unescapeHTML("<encoded>#{text}</encoded>")).root
css_select(root, "encoded:root", &block)[0]
end
begin
old_selected, @selected = @selected, selected
assert_select ":root", &block
ensure
@selected = old_selected
end
end
# :call-seq:
# assert_select_email { }
#
# Extracts the body of an email and runs nested assertions on it.
#
# You must enable deliveries for this assertion to work, use:
# ActionMailer::Base.perform_deliveries = true
#
# === Example
#
# assert_select_email do
# assert_select "h1", "Email alert"
# end
def assert_select_email(&block)
deliveries = ActionMailer::Base.deliveries
assert !deliveries.empty?, "No e-mail in delivery list"
for delivery in deliveries
for part in delivery.parts
if part["Content-Type"].to_s =~ /^text\/html\W/
root = HTML::Document.new(part.body).root
assert_select root, ":root", &block
end
end
end
end
protected
unless const_defined?(:RJS_STATEMENTS)
RJS_STATEMENTS = {
:replace => /Element\.replace/,
:replace_html => /Element\.update/
}
RJS_INSERTIONS = [:top, :bottom, :before, :after]
RJS_INSERTIONS.each do |insertion|
RJS_STATEMENTS["insert_#{insertion}".to_sym] = Regexp.new(Regexp.quote("new Insertion.#{insertion.to_s.camelize}"))
end
RJS_STATEMENTS[:any] = Regexp.new("(#{RJS_STATEMENTS.values.join('|')})")
RJS_STATEMENTS[:insert_html] = Regexp.new(RJS_INSERTIONS.collect do |insertion|
Regexp.quote("new Insertion.#{insertion.to_s.camelize}")
end.join('|'))
RJS_PATTERN_HTML = /"((\\"|[^"])*)"/
RJS_PATTERN_EVERYTHING = Regexp.new("#{RJS_STATEMENTS[:any]}\\(\"([^\"]*)\", #{RJS_PATTERN_HTML}\\)",
Regexp::MULTILINE)
end
# #assert_select and #css_select call this to obtain the content in the HTML
# page, or from all the RJS statements, depending on the type of response.
def response_from_page_or_rjs()
content_type = @response.headers["Content-Type"]
if content_type && content_type =~ /text\/javascript/
body = @response.body.dup
root = HTML::Node.new(nil)
while true
next if body.sub!(RJS_PATTERN_EVERYTHING) do |match|
# RJS encodes double quotes and line breaks.
html = $3
html.gsub!(/\\"/, "\"")
html.gsub!(/\\n/, "\n")
matches = HTML::Document.new(html).root.children.select { |n| n.tag? }
root.children.concat matches
""
end
break
end
root
else
html_document.root
end
end
end
end
end
