module ActionDispatch::Assertions::TagAssertions

Identical to assert_tag, but asserts that a matching tag does not exist. (See assert_tag for a full discussion of the syntax.)

# Assert that there is not a "div" containing a "p"
assert_no_tag tag: "div", descendant: { tag: "p" }

# Assert that an unordered list is empty
assert_no_tag tag: "ul", descendant: { tag: "li" }

# Assert that there is not a "p" tag with between 1 to 3 "img" tags
# as immediate children
assert_no_tag tag: "p",
           children: { count: 1..3, only: { tag: "img" } }

# File actionpack/lib/action_dispatch/testing/assertions/tag.rb, line 115
def assert_no_tag(*opts)
  opts = opts.size > 1 ? opts.last.merge({ :tag => opts.first.to_s }) : opts.first
  tag = find_tag(opts)
  assert !tag, "expected no tag, but found tag matching #{opts.inspect} in:\n#{@response.body.inspect}"
end

Asserts that there is a tag/node/element in the body of the response that meets all of the given conditions. The conditions parameter must be a hash of any of the following keys (all are optional):

• :tag: the node type must match the corresponding value

• :attributes: a hash. The node's attributes must match the corresponding values in the hash.

• :parent: a hash. The node's parent must match the corresponding hash.

• :child: a hash. At least one of the node's immediate children must meet the criteria described by the hash.

• :ancestor: a hash. At least one of the node's ancestors must meet the criteria described by the hash.

• :descendant: a hash. At least one of the node's descendants must meet the criteria described by the hash.

• :sibling: a hash. At least one of the node's siblings must meet the criteria described by the hash.

• :after: a hash. The node must be after any sibling meeting the criteria described by the hash, and at least one sibling must match.

• :before: a hash. The node must be before any sibling meeting the criteria described by the hash, and at least one sibling must match.

• :children: a hash, for counting children of a node. Accepts the keys:

  • :count: either a number or a range which must equal (or include) the number of children that match.

  • :less_than: the number of matching children must be less than this number.

  • :greater_than: the number of matching children must be greater than this number.

  • :only: another hash consisting of the keys to use to match on the children, and only matching children will be counted.

• :content: the textual content of the node must match the given value. This will not match HTML tags in the body of a tag–only text.

Conditions are matched using the following algorithm:

• if the condition is a string, it must be a substring of the value.

• if the condition is a regexp, it must match the value.

• if the condition is a number, the value must match number.to_s.

• if the condition is true, the value must not be nil.

• if the condition is false or nil, the value must be nil.

  # Assert that there is a “span” tag #assert_tag tag: “span”

  # Assert that there is a “span” tag with id=“x” #assert_tag tag: “span”, attributes: { id: “x” }

  # Assert that there is a “span” tag using the short-hand #assert_tag :span

  # Assert that there is a “span” tag with id=“x” using the short-hand #assert_tag :span, attributes: { id: “x” }

  # Assert that there is a “span” inside of a “div” #assert_tag tag: “span”, parent: { tag: “div” }

  # Assert that there is a “span” somewhere inside a table #assert_tag tag: “span”, ancestor: { tag: “table” }

  # Assert that there is a “span” with at least one “em” child #assert_tag tag: “span”, child: { tag: “em” }

  # Assert that there is a “span” containing a (possibly nested) # “strong” tag. #assert_tag tag: “span”, descendant: { tag: “strong” }

  # Assert that there is a “span” containing between 2 and 4 “em” tags # as immediate children #assert_tag tag: “span”,

  children: { count: 2..4, only: { tag: "em" } }

  # Get funky: assert that there is a “div”, with an “ul” ancestor # and an “li” parent (with “class” = “enum”), and containing a # “span” descendant that contains text matching /hello world/ #assert_tag tag: “div”,

  ancestor: { tag: "ul" },
  parent: { tag: "li",
               attributes: { class: "enum" } },
  descendant: { tag: "span",
                   child: /hello world/ }

Please note: assert_tag and assert_no_tag only work with well-formed XHTML. They recognize a few tags as implicitly self-closing (like br and hr and such) but will not work correctly with tags that allow optional closing tags (p, li, td). You must explicitly close all of your tags to use these assertions.

# File actionpack/lib/action_dispatch/testing/assertions/tag.rb, line 96
def assert_tag(*opts)
  opts = opts.size > 1 ? opts.last.merge({ :tag => opts.first.to_s }) : opts.first
  tag = find_tag(opts)
  assert tag, "expected tag, but no tag found matching #{opts.inspect} in:\n#{@response.body.inspect}"
end