Module: Capybara::Node::Matchers

Included in:
Base, Simple
Defined in:
lib/capybara/node/matchers.rb

Instance Method Summary collapse

Instance Method Details

#==(other) ⇒ Object



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# File 'lib/capybara/node/matchers.rb', line 592

def ==(other)
  self.eql?(other) || (other.respond_to?(:base) && base == other.base)
end

#assert_matches_selector(*args) ⇒ Object

Asserts that the current_node matches a given selector

node.assert_matches_selector('p#foo')
node.assert_matches_selector(:xpath, '//p[@id="foo"]')
node.assert_matches_selector(:foo)

It also accepts all options that Finders#all accepts, such as :text and :visible.

node.assert_matches_selector('li', :text => 'Horse', :visible => true)

Raises:



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# File 'lib/capybara/node/matchers.rb', line 179

def assert_matches_selector(*args)
  query = Capybara::Queries::MatchQuery.new(*args)
  synchronize(query.wait) do
    result = query.resolve_for(self.query_scope)
    unless result.include? self
      raise Capybara::ExpectationNotMet, "Item does not match the provided selector"
    end
  end
  return true
end

#assert_no_selector(*args) ⇒ Object Also known as: refute_selector

Asserts that a given selector is not on the page or current node. Usage is identical to Capybara::Node::Matchers#assert_selector

Query options such as :count, :minimum, :maximum, and :between are considered to be an integral part of the selector. This will return true, for example, if a page contains 4 anchors but the query expects 5:

page.assert_no_selector('a', :minimum => 1) # Found, raises Capybara::ExpectationNotMet
page.assert_no_selector('a', :count => 4)   # Found, raises Capybara::ExpectationNotMet
page.assert_no_selector('a', :count => 5)   # Not Found, returns true

Raises:



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# File 'lib/capybara/node/matchers.rb', line 150

def assert_no_selector(*args)
  query = Capybara::Queries::SelectorQuery.new(*args)
  synchronize(query.wait) do
    result = query.resolve_for(self)
    matches_count = Capybara::Helpers.matches_count?(result.size, query.options)
    if matches_count && ((result.size > 0) || Capybara::Helpers.expects_none?(query.options))
      raise Capybara::ExpectationNotMet, result.negative_failure_message
    end
  end
  return true
end

#assert_no_text(type, text, options = {}) ⇒ true #assert_no_text(text, options = {}) ⇒ true

Asserts that the page or current node doesn't have the given text content, ignoring any HTML tags.

Overloads:

  • #assert_no_text(type, text, options = {}) ⇒ true

    Parameters:

    • type (:all, :visible)

      Whether to check for only visible or all text. If this parameter is missing or nil then we use the value of `Capybara.ignore_hidden_elements`, which defaults to `true`, corresponding to `:visible`.

    • text (String, Regexp)

      The string/regexp to check for. If it's a string, text is expected to include it. If it's a regexp, text is expected to match it.

    Options Hash (options):

    • :count (Integer) — default: nil

      Number of times the text is expected to occur

    • :minimum (Integer) — default: nil

      Minimum number of times the text is expected to occur

    • :maximum (Integer) — default: nil

      Maximum number of times the text is expected to occur

    • :between (Range) — default: nil

      Range of times that is expected to contain number of times text occurs

    • :wait (Numeric) — default: Capybara.default_max_wait_time

      Maximum time that Capybara will wait for text to eq/match given string/regexp argument

  • #assert_no_text(text, options = {}) ⇒ true

    Parameters:

    • text (String, Regexp)

      The string/regexp to check for. If it's a string, text is expected to include it. If it's a regexp, text is expected to match it.

    Options Hash (options):

    • :count (Integer) — default: nil

      Number of times the text is expected to occur

    • :minimum (Integer) — default: nil

      Minimum number of times the text is expected to occur

    • :maximum (Integer) — default: nil

      Maximum number of times the text is expected to occur

    • :between (Range) — default: nil

      Range of times that is expected to contain number of times text occurs

    • :wait (Numeric) — default: Capybara.default_max_wait_time

      Maximum time that Capybara will wait for text to eq/match given string/regexp argument

Returns:

  • (true)

Raises:



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# File 'lib/capybara/node/matchers.rb', line 541

def assert_no_text(*args)
  query = Capybara::Queries::TextQuery.new(*args)
  synchronize(query.wait) do
    count = query.resolve_for(self)
    matches_count = Capybara::Helpers.matches_count?(count, query.options)
    if matches_count && ((count > 0) || Capybara::Helpers.expects_none?(query.options))
      raise Capybara::ExpectationNotMet, query.negative_failure_message
    end
  end
  return true
end

#assert_not_matches_selector(*args) ⇒ Object Also known as: refute_matches_selector



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# File 'lib/capybara/node/matchers.rb', line 190

def assert_not_matches_selector(*args)
  query = Capybara::Queries::MatchQuery.new(*args)
  synchronize(query.wait) do
    result = query.resolve_for(self.query_scope)
    if result.include? self
      raise Capybara::ExpectationNotMet, 'Item matched the provided selector'
    end
  end
  return true
end

#assert_selector(*args) ⇒ Object

Asserts that a given selector is on the page or current node.

page.assert_selector('p#foo')
page.assert_selector(:xpath, './/p[@id="foo"]')
page.assert_selector(:foo)

By default it will check if the expression occurs at least once, but a different number can be specified.

page.assert_selector('p#foo', :count => 4)

This will check if the expression occurs exactly 4 times. See Finders#all for other available result size options.

If a :count of 0 is specified, it will behave like #assert_no_selector; however, use of that method is preferred over this one.

It also accepts all options that Finders#all accepts, such as :text and :visible.

page.assert_selector('li', :text => 'Horse', :visible => true)

`assert_selector` can also accept XPath expressions generated by the XPath gem:

page.assert_selector(:xpath, XPath.descendant(:p))

Parameters:

  • options (Hash)

    a customizable set of options

Raises:



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# File 'lib/capybara/node/matchers.rb', line 122

def assert_selector(*args)
  query = Capybara::Queries::SelectorQuery.new(*args)
  synchronize(query.wait) do
    result = query.resolve_for(self)
    matches_count = Capybara::Helpers.matches_count?(result.size, query.options)
    unless matches_count && ((result.size > 0) || Capybara::Helpers.expects_none?(query.options))
      raise Capybara::ExpectationNotMet, result.failure_message
    end
  end
  return true
end

#assert_text(type, text, options = {}) ⇒ true #assert_text(text, options = {}) ⇒ true

Asserts that the page or current node has the given text content, ignoring any HTML tags.

Overloads:

  • #assert_text(type, text, options = {}) ⇒ true

    Parameters:

    • type (:all, :visible)

      Whether to check for only visible or all text. If this parameter is missing or nil then we use the value of `Capybara.ignore_hidden_elements`, which defaults to `true`, corresponding to `:visible`.

    • text (String, Regexp)

      The string/regexp to check for. If it's a string, text is expected to include it. If it's a regexp, text is expected to match it.

    Options Hash (options):

    • :count (Integer) — default: nil

      Number of times the text is expected to occur

    • :minimum (Integer) — default: nil

      Minimum number of times the text is expected to occur

    • :maximum (Integer) — default: nil

      Maximum number of times the text is expected to occur

    • :between (Range) — default: nil

      Range of times that is expected to contain number of times text occurs

    • :wait (Numeric) — default: Capybara.default_max_wait_time

      Maximum time that Capybara will wait for text to eq/match given string/regexp argument

  • #assert_text(text, options = {}) ⇒ true

    Parameters:

    • text (String, Regexp)

      The string/regexp to check for. If it's a string, text is expected to include it. If it's a regexp, text is expected to match it.

    Options Hash (options):

    • :count (Integer) — default: nil

      Number of times the text is expected to occur

    • :minimum (Integer) — default: nil

      Minimum number of times the text is expected to occur

    • :maximum (Integer) — default: nil

      Maximum number of times the text is expected to occur

    • :between (Range) — default: nil

      Range of times that is expected to contain number of times text occurs

    • :wait (Numeric) — default: Capybara.default_max_wait_time

      Maximum time that Capybara will wait for text to eq/match given string/regexp argument

Returns:

  • (true)

Raises:



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# File 'lib/capybara/node/matchers.rb', line 521

def assert_text(*args)
  query = Capybara::Queries::TextQuery.new(*args)
  synchronize(query.wait) do
    count = query.resolve_for(self)
    matches_count = Capybara::Helpers.matches_count?(count, query.options)
    unless matches_count && ((count > 0) || Capybara::Helpers.expects_none?(query.options))
      raise Capybara::ExpectationNotMet, query.failure_message
    end
  end
  return true
end

#has_button?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has a button with the given text, value or id.

Parameters:

  • locator (String)

    The text, value or id of a button to check for

Returns:

  • (Boolean)

    Whether it exists



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# File 'lib/capybara/node/matchers.rb', line 320

def has_button?(locator, options={})
  has_selector?(:button, locator, options)
end

#has_checked_field?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has a radio button or checkbox with the given label, value or id, that is currently checked.

Parameters:

  • locator (String)

    The label, name or id of a checked field

Returns:

  • (Boolean)

    Whether it exists



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# File 'lib/capybara/node/matchers.rb', line 385

def has_checked_field?(locator, options={})
  has_selector?(:field, locator, options.merge(:checked => true))
end

#has_css?(path, options = {}) ⇒ Boolean

Checks if a given CSS selector is on the page or current node.

page.has_css?('p#foo')

By default it will check if the selector occurs at least once, but a different number can be specified.

page.has_css?('p#foo', :count => 4)

This will check if the selector occurs exactly 4 times.

It also accepts all options that Finders#all accepts, such as :text and :visible.

page.has_css?('li', :text => 'Horse', :visible => true)

Parameters:

  • path (String)

    A CSS selector

  • options (Hash) (defaults to: {})

    a customizable set of options

Options Hash (options):

  • :count (Integer) — default: nil

    Number of times the selector should occur

Returns:

  • (Boolean)

    If the selector exists



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# File 'lib/capybara/node/matchers.rb', line 270

def has_css?(path, options={})
  has_selector?(:css, path, options)
end

#has_field?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has a form field with the given label, name or id.

For text fields and other textual fields, such as textareas and HTML5 email/url/etc. fields, it's possible to specify a :with option to specify the text the field should contain:

page.has_field?('Name', :with => 'Jonas')

It is also possible to filter by the field type attribute:

page.has_field?('Email', :type => 'email')

Note: 'textarea' and 'select' are valid type values, matching the associated tag names.

Parameters:

  • locator (String)

    The label, name or id of a field to check for

  • options (Hash) (defaults to: {})

    a customizable set of options

Options Hash (options):

  • :with (String, Regexp)

    The text content of the field or a Regexp to match

  • :type (String)

    The type attribute of the field

Returns:

  • (Boolean)

    Whether it exists



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# File 'lib/capybara/node/matchers.rb', line 358

def has_field?(locator, options={})
  has_selector?(:field, locator, options)
end

#has_link?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has a link with the given text or id.

Parameters:

  • locator (String)

    The text or id of a link to check for

  • options (defaults to: {})

Options Hash (options):

  • :href (String, Regexp)

    The value the href attribute must be

Returns:

  • (Boolean)

    Whether it exists



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# File 'lib/capybara/node/matchers.rb', line 296

def has_link?(locator, options={})
  has_selector?(:link, locator, options)
end

#has_no_button?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has no button with the given text, value or id.

Parameters:

  • locator (String)

    The text, value or id of a button to check for

Returns:

  • (Boolean)

    Whether it doesn't exist



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# File 'lib/capybara/node/matchers.rb', line 332

def has_no_button?(locator, options={})
  has_no_selector?(:button, locator, options)
end

#has_no_checked_field?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has no radio button or checkbox with the given label, value or id, that is currently checked.

Parameters:

  • locator (String)

    The label, name or id of a checked field

Returns:

  • (Boolean)

    Whether it doesn't exist



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# File 'lib/capybara/node/matchers.rb', line 398

def has_no_checked_field?(locator, options={})
  has_no_selector?(:field, locator, options.merge(:checked => true))
end

#has_no_css?(path, options = {}) ⇒ Boolean

Checks if a given CSS selector is not on the page or current node. Usage is identical to Capybara::Node::Matchers#has_css?

Returns:

  • (Boolean)


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# File 'lib/capybara/node/matchers.rb', line 282

def has_no_css?(path, options={})
  has_no_selector?(:css, path, options)
end

#has_no_field?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has no form field with the given label, name or id. See #has_field?.

Parameters:

  • locator (String)

    The label, name or id of a field to check for

  • options (Hash) (defaults to: {})

    a customizable set of options

Options Hash (options):

  • :with (String, Regexp)

    The text content of the field or a Regexp to match

  • :type (String)

    The type attribute of the field

Returns:

  • (Boolean)

    Whether it doesn't exist



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# File 'lib/capybara/node/matchers.rb', line 372

def has_no_field?(locator, options={})
  has_no_selector?(:field, locator, options)
end

#has_no_link?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has no link with the given text or id.

Returns:

  • (Boolean)

    Whether it doesn't exist



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# File 'lib/capybara/node/matchers.rb', line 308

def has_no_link?(locator, options={})
  has_no_selector?(:link, locator, options)
end

#has_no_select?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has no select field with the given label, name or id. See #has_select?.

Parameters:

  • locator (String)

    The label, name or id of a select box

  • options (Hash) (defaults to: {})

    a customizable set of options

Returns:

  • (Boolean)

    Whether it doesn't exist



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# File 'lib/capybara/node/matchers.rb', line 468

def has_no_select?(locator, options={})
  has_no_selector?(:select, locator, options)
end

#has_no_selector?(*args) ⇒ Boolean

Checks if a given selector is not on the page or current node. Usage is identical to Capybara::Node::Matchers#has_selector?

Returns:

  • (Boolean)


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# File 'lib/capybara/node/matchers.rb', line 53

def has_no_selector?(*args)
  assert_no_selector(*args)
rescue Capybara::ExpectationNotMet
  return false
end

#has_no_table?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has no table with the given id or caption. See #has_table?.

Parameters:

  • locator (String)

    The id or caption of a table

Returns:

  • (Boolean)

    Whether it doesn't exist



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# File 'lib/capybara/node/matchers.rb', line 494

def has_no_table?(locator, options={})
  has_no_selector?(:table, locator, options)
end

#has_no_text?(type, text, options = {}) ⇒ Boolean #has_no_text?(text, options = {}) ⇒ Boolean Also known as: has_no_content?

Checks if the page or current node does not have the given text content, ignoring any HTML tags and normalizing whitespace.

Overloads:

  • #has_no_text?(type, text, options = {}) ⇒ Boolean

    Parameters:

    • type (:all, :visible)

      Whether to check for only visible or all text. If this parameter is missing or nil then we use the value of `Capybara.ignore_hidden_elements`, which defaults to `true`, corresponding to `:visible`.

    • text (String, Regexp)

      The string/regexp to check for. If it's a string, text is expected to include it. If it's a regexp, text is expected to match it.

    Options Hash (options):

    • :count (Integer) — default: nil

      Number of times the text is expected to occur

    • :minimum (Integer) — default: nil

      Minimum number of times the text is expected to occur

    • :maximum (Integer) — default: nil

      Maximum number of times the text is expected to occur

    • :between (Range) — default: nil

      Range of times that is expected to contain number of times text occurs

    • :wait (Numeric) — default: Capybara.default_max_wait_time

      Maximum time that Capybara will wait for text to eq/match given string/regexp argument

  • #has_no_text?(text, options = {}) ⇒ Boolean

    Parameters:

    • text (String, Regexp)

      The string/regexp to check for. If it's a string, text is expected to include it. If it's a regexp, text is expected to match it.

    Options Hash (options):

    • :count (Integer) — default: nil

      Number of times the text is expected to occur

    • :minimum (Integer) — default: nil

      Minimum number of times the text is expected to occur

    • :maximum (Integer) — default: nil

      Maximum number of times the text is expected to occur

    • :between (Range) — default: nil

      Range of times that is expected to contain number of times text occurs

    • :wait (Numeric) — default: Capybara.default_max_wait_time

      Maximum time that Capybara will wait for text to eq/match given string/regexp argument

Returns:

  • (Boolean)

    Whether it doesn't exist



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# File 'lib/capybara/node/matchers.rb', line 585

def has_no_text?(*args)
  assert_no_text(*args)
rescue Capybara::ExpectationNotMet
  return false
end

#has_no_unchecked_field?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has no radio button or checkbox with the given label, value or id, that is currently unchecked.

Parameters:

  • locator (String)

    The label, name or id of an unchecked field

Returns:

  • (Boolean)

    Whether it doesn't exist



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# File 'lib/capybara/node/matchers.rb', line 424

def has_no_unchecked_field?(locator, options={})
  has_no_selector?(:field, locator, options.merge(:unchecked => true))
end

#has_no_xpath?(path, options = {}) ⇒ Boolean

Checks if a given XPath expression is not on the page or current node. Usage is identical to Capybara::Node::Matchers#has_xpath?

Returns:

  • (Boolean)


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# File 'lib/capybara/node/matchers.rb', line 243

def has_no_xpath?(path, options={})
  has_no_selector?(:xpath, path, options)
end

#has_select?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has a select field with the given label, name or id.

It can be specified which option should currently be selected:

page.has_select?('Language', :selected => 'German')

For multiple select boxes, several options may be specified:

page.has_select?('Language', :selected => ['English', 'German'])

It's also possible to check if the exact set of options exists for this select box:

page.has_select?('Language', :options => ['English', 'German', 'Spanish'])

You can also check for a partial set of options:

page.has_select?('Language', :with_options => ['English', 'German'])

Parameters:

  • locator (String)

    The label, name or id of a select box

  • options (Hash) (defaults to: {})

    a customizable set of options

Options Hash (options):

  • :options (Array)

    Options which should be contained in this select box

  • :with_options (Array)

    Partial set of options which should be contained in this select box

  • :selected (String, Array)

    Options which should be selected

Returns:

  • (Boolean)

    Whether it exists



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# File 'lib/capybara/node/matchers.rb', line 456

def has_select?(locator, options={})
  has_selector?(:select, locator, options)
end

#has_selector?(*args) ⇒ Boolean

Checks if a given selector is on the page or current node.

page.has_selector?('p#foo')
page.has_selector?(:xpath, './/p[@id="foo"]')
page.has_selector?(:foo)

By default it will check if the expression occurs at least once, but a different number can be specified.

page.has_selector?('p.foo', :count => 4)

This will check if the expression occurs exactly 4 times.

It also accepts all options that Finders#all accepts, such as :text and :visible.

page.has_selector?('li', :text => 'Horse', :visible => true)

has_selector? can also accept XPath expressions generated by the XPath gem:

page.has_selector?(:xpath, XPath.descendant(:p))

Parameters:

  • args

Options Hash (*args):

  • :count (Integer) — default: nil

    Number of times the text should occur

  • :minimum (Integer) — default: nil

    Minimum number of times the text should occur

  • :maximum (Integer) — default: nil

    Maximum number of times the text should occur

  • :between (Range) — default: nil

    Range of times that should contain number of times text occurs

Returns:

  • (Boolean)

    If the expression exists



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# File 'lib/capybara/node/matchers.rb', line 39

def has_selector?(*args)
  assert_selector(*args)
rescue Capybara::ExpectationNotMet
  return false
end

#has_table?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has a table with the given id or caption:

page.has_table?('People')

Parameters:

  • locator (String)

    The id or caption of a table

Returns:

  • (Boolean)

    Whether it exist



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# File 'lib/capybara/node/matchers.rb', line 482

def has_table?(locator, options={})
  has_selector?(:table, locator, options)
end

#has_text?(type, text, options = {}) ⇒ Boolean #has_text?(text, options = {}) ⇒ Boolean Also known as: has_content?

Checks if the page or current node has the given text content, ignoring any HTML tags.

Whitespaces are normalized in both node's text and passed text parameter. Note that whitespace isn't normalized in passed regexp as normalizing whitespace in regexp isn't easy and doesn't seem to be worth it.

By default it will check if the text occurs at least once, but a different number can be specified.

page.has_text?('lorem ipsum', between: 2..4)

This will check if the text occurs from 2 to 4 times.

Overloads:

  • #has_text?(type, text, options = {}) ⇒ Boolean

    Parameters:

    • type (:all, :visible)

      Whether to check for only visible or all text. If this parameter is missing or nil then we use the value of `Capybara.ignore_hidden_elements`, which defaults to `true`, corresponding to `:visible`.

    • text (String, Regexp)

      The string/regexp to check for. If it's a string, text is expected to include it. If it's a regexp, text is expected to match it.

    Options Hash (options):

    • :count (Integer) — default: nil

      Number of times the text is expected to occur

    • :minimum (Integer) — default: nil

      Minimum number of times the text is expected to occur

    • :maximum (Integer) — default: nil

      Maximum number of times the text is expected to occur

    • :between (Range) — default: nil

      Range of times that is expected to contain number of times text occurs

    • :wait (Numeric) — default: Capybara.default_max_wait_time

      Maximum time that Capybara will wait for text to eq/match given string/regexp argument

  • #has_text?(text, options = {}) ⇒ Boolean

    Parameters:

    • text (String, Regexp)

      The string/regexp to check for. If it's a string, text is expected to include it. If it's a regexp, text is expected to match it.

    Options Hash (options):

    • :count (Integer) — default: nil

      Number of times the text is expected to occur

    • :minimum (Integer) — default: nil

      Minimum number of times the text is expected to occur

    • :maximum (Integer) — default: nil

      Maximum number of times the text is expected to occur

    • :between (Range) — default: nil

      Range of times that is expected to contain number of times text occurs

    • :wait (Numeric) — default: Capybara.default_max_wait_time

      Maximum time that Capybara will wait for text to eq/match given string/regexp argument

Returns:

  • (Boolean)

    Whether it exists



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# File 'lib/capybara/node/matchers.rb', line 571

def has_text?(*args)
  assert_text(*args)
rescue Capybara::ExpectationNotMet
  return false
end

#has_unchecked_field?(locator, options = {}) ⇒ Boolean

Checks if the page or current node has a radio button or checkbox with the given label, value or id, that is currently unchecked.

Parameters:

  • locator (String)

    The label, name or id of an unchecked field

Returns:

  • (Boolean)

    Whether it exists



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# File 'lib/capybara/node/matchers.rb', line 411

def has_unchecked_field?(locator, options={})
  has_selector?(:field, locator, options.merge(:unchecked => true))
end

#has_xpath?(path, options = {}) ⇒ Boolean

Checks if a given XPath expression is on the page or current node.

page.has_xpath?('.//p[@id="foo"]')

By default it will check if the expression occurs at least once, but a different number can be specified.

page.has_xpath?('.//p[@id="foo"]', :count => 4)

This will check if the expression occurs exactly 4 times.

It also accepts all options that Finders#all accepts, such as :text and :visible.

page.has_xpath?('.//li', :text => 'Horse', :visible => true)

has_xpath? can also accept XPath expressions generate by the XPath gem:

xpath = XPath.generate { |x| x.descendant(:p) }
page.has_xpath?(xpath)

Parameters:

  • path (String)

    An XPath expression

  • options (Hash) (defaults to: {})

    a customizable set of options

Options Hash (options):

  • :count (Integer) — default: nil

    Number of times the expression should occur

Returns:

  • (Boolean)

    If the expression exists



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# File 'lib/capybara/node/matchers.rb', line 231

def has_xpath?(path, options={})
  has_selector?(:xpath, path, options)
end

#matches_selector?(*args) ⇒ Boolean

Checks if the current node matches given selector Usage is identical to Capybara::Node::Matchers#has_selector?

Returns:

  • (Boolean)


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# File 'lib/capybara/node/matchers.rb', line 67

def matches_selector?(*args)
  assert_matches_selector(*args)
rescue Capybara::ExpectationNotMet
  return false
end

#not_matches_selector?(*args) ⇒ Boolean

Checks if the current node does not match given selector Usage is identical to Capybara::Node::Matchers#has_selector?

Returns:

  • (Boolean)


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# File 'lib/capybara/node/matchers.rb', line 82

def not_matches_selector?(*args)
  assert_not_matches_selector(*args)
rescue Capybara::ExpectationNotMet
  return false
end