Capybara

Changes in syntax
Selectors for the content of an element
before:

response.should have_selector("title", :content => "My Title")
after:
?
response.body.should have_selector("head title", :text => "My Title")

Value of an input field
before:
?
response.should have_selector("input", :value => "input field value")
after:
?
response.body.should have_selector("input[value='input field value']")

Link with url and content
before:
?
response.should have_selector("a", :href => "/url/path", :content => "Link text"
after:
?
response.body.should have_link("Link text", :href => "/url/path")

Selectors cannot be nested
Instead you can use
?
within("div.container") do
  response.body.should have_link("Link text")
end

or just combine selectors one after the other in one big string
?
response.body.should have_selector("div.container a[href='/url/path']")