Parent

Capybara::Node::Base

A {Capybara::Node::Base} represents either an element on a page through the subclass {Capybara::Node::Element} or a document through {Capybara::Node::Document}.

Both types of Node share the same methods, used for interacting with the elements on the page. These methods are divided into three categories, finders, actions and matchers. These are found in the modules {Capybara::Node::Finders}, {Capybara::Node::Actions} and {Capybara::Node::Matchers} respectively.

A {Capybara::Session} exposes all methods from {Capybara::Node::Document} directly:

session = Capybara::Session.new(:rack_test, my_app)
session.visit('/')
session.fill_in('Foo', :with => 'Bar')    # from Capybara::Node::Actions
bar = session.find('#bar')                # from Capybara::Node::Finders
bar.select('Baz', :from => 'Quox')        # from Capybara::Node::Actions
session.has_css?('#foobar')               # from Capybara::Node::Matchers

Attributes

base[R]
parent[R]
session[R]

Public Class Methods

new(session, base) click to toggle source
# File lib/capybara/node/base.rb, line 31
def initialize(session, base)
  @session = session
  @base = base
  @unsynchronized = false
end

Public Instance Methods

reload() click to toggle source

overridden in subclasses, e.g. Capybara::Node::Element

# File lib/capybara/node/base.rb, line 38
def reload
  self
end
synchronize(seconds=Capybara.default_wait_time) click to toggle source

This method is Capybara's primary defence agains asynchronicity problems. It works by attempting to run a given block of code until it succeeds. The exact behaviour of this method depends on a number of factors. Basically there are certain exceptions which, when raised from the block, instead of bubbling up, are caught, and the block is re-run.

Certain drivers, such as RackTest, have no support for aynchronous processes, these drivers run the block, and any error raised bubbles up immediately. This allows faster turn around in the case where an expectation fails.

Only exceptions that are {Capybara::ElementNotFound} or any subclass thereof cause the block to be rerun. Drivers may specify additional exceptions which also cause reruns. This usually occurs when a node is manipulated which no longer exists on the page. For example, the Selenium driver specifies `Selenium::WebDriver::Error::ObsoleteElementError`.

As long as any of these exceptions are thrown, the block is re-run, until a certain amount of time passes. The amount of time defaults to {Capybara.default_wait_time} and can be overriden through the `seconds` argument. This time is compared with the system time to see how much time has passed. If the return value of {Time.now} is stubbed out, Capybara will raise `Capybara::FrozenInTime`.

@param [Integer] seconds Number of seconds to retry this block @return [Object] The result of the given block @raise [Capybara::FrozenInTime] If the return value of {Time.now} appears stuck

# File lib/capybara/node/base.rb, line 74
def synchronize(seconds=Capybara.default_wait_time)
  start_time = Time.now

  begin
    yield
  rescue => e
    raise e if @unsynchronized
    raise e unless driver.wait?
    raise e unless driver.invalid_element_errors.include?(e.class) || e.is_a?(Capybara::ElementNotFound)
    raise e if (Time.now - start_time) >= seconds
    sleep(0.05)
    raise Capybara::FrozenInTime, "time appears to be frozen, Capybara does not work with libraries which freeze time, consider using time travelling instead" if Time.now == start_time
    reload if Capybara.automatic_reload
    retry
  end
end
unsynchronized() click to toggle source

Within the given block, prevent synchronize from having any effect.

This is an internal method which should not be called unless you are absolutely sure of what you're doing.

@api private @return [Object] The result of the given block

# File lib/capybara/node/base.rb, line 101
def unsynchronized
  orig = @unsynchronized
  @unsynchronized = true
  yield
ensure
  @unsynchronized = orig
end

Protected Instance Methods

driver() click to toggle source
# File lib/capybara/node/base.rb, line 111
def driver
  session.driver
end

[Validate]

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