Searching within HTML elements in RSpec view tests - ruby-on-rails-4

Question

As part of my view specs, I sometimes like to check that the right text is also rendered for a certain element on the page.
Let's say the rendered HTML is -
<div class="user-msg">
<b>Thank You!</b>
</div>
I might test in my view specs as -
expect(rendered).to match(/Thank You/)
However this could incorrectly fail or pass depending on whether there's something else on the page that also says "Thank You".
How do I search within the specific <div> in question? If this were a feature test I'd use Capybara to select the node -
within(".user-mssg") { expect(page.body).to have_content("Thank You") }
How do I find a specific HTML element (e.g. .user-msg) and search within it in my View specs?
Thanks!
Edit: "Thank you!"

Answer 1

rspec-html-matchers does just that:
<h1>Simple Form</h1>
<form action="/users" method="post">
<p>
<input type="email" name="user[email]" />
</p>
<p>
<input type="submit" id="special_submit" />
</p>
</form>
spec:
expect(rendered).to have_tag('form', :with => { :action => '/users', :method => 'post' }) do
with_tag "input", :with => { :name => "user[email]", :type => 'email' }
with_tag "input#special_submit", :count => 1
without_tag "h1", :text => 'unneeded tag'
without_tag "p", :text => /content/i
end