Method: Rails::Controller::Testing::TemplateAssertions#assert_template

Defined in:
lib/rails/controller/testing/template_assertions.rb

#assert_template(options = {}, message = nil) ⇒ Object

Asserts that the request was rendered with the appropriate template file or partials.

# assert that the "new" view template was rendered
assert_template "new"

# assert that the exact template "admin/posts/new" was rendered
assert_template %r{\Aadmin/posts/new\Z}

# assert that the layout 'admin' was rendered
assert_template layout: 'admin'
assert_template layout: 'layouts/admin'
assert_template layout: :admin

# assert that no layout was rendered
assert_template layout: nil
assert_template layout: false

# assert that the "_customer" partial was rendered twice
assert_template partial: '_customer', count: 2

# assert that no partials were rendered
assert_template partial: false

# assert that a file was rendered
assert_template file: "README.rdoc"

# assert that no file was rendered
assert_template file: nil
assert_template file: false

In a view test case, you can also assert that specific locals are passed to partials:

# assert that the "_customer" partial was rendered with a specific object
assert_template partial: '_customer', locals: { customer: @customer }



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# File 'lib/rails/controller/testing/template_assertions.rb', line 108

def assert_template(options = {}, message = nil)
  # Force body to be read in case the template is being streamed.
  response.body

  case options
  when NilClass, Regexp, String, Symbol
    options = options.to_s if Symbol === options
    rendered = @_templates
    msg = message || sprintf("expecting <%s> but rendering with <%s>",
            options.inspect, rendered.keys)
    matches_template =
      case options
      when String
        !options.empty? && rendered.any? do |t, num|
          options_splited = options.split(File::SEPARATOR)
          t_splited = t.split(File::SEPARATOR)
          t_splited.last(options_splited.size) == options_splited
        end
      when Regexp
        rendered.any? { |t,num| t.match(options) }
      when NilClass
        rendered.blank?
      end
    assert matches_template, msg
  when Hash
    options.assert_valid_keys(:layout, :partial, :locals, :count, :file)

    if options.key?(:layout)
      expected_layout = options[:layout]
      msg = message || sprintf("expecting layout <%s> but action rendered <%s>",
              expected_layout, @_layouts.keys)

      case expected_layout
      when String, Symbol
        assert_includes @_layouts.keys, expected_layout.to_s, msg
      when Regexp
        assert(@_layouts.keys.any? {|l| l =~ expected_layout }, msg)
      when nil, false
        assert(@_layouts.empty?, msg)
      else
        raise ArgumentError, "assert_template only accepts a String, Symbol, Regexp, nil or false for :layout"
      end
    end

    if options[:file]
      assert_includes @_files.keys, options[:file]
    elsif options.key?(:file)
      assert @_files.blank?, "expected no files but #{@_files.keys} was rendered"
    end

    if expected_partial = options[:partial]
      if expected_locals = options[:locals]
        if defined?(@_rendered_views)
          view = expected_partial.to_s.sub(/^_/, '').sub(/\/_(?=[^\/]+\z)/, '/')

          partial_was_not_rendered_msg = "expected %s to be rendered but it was not." % view
          assert_includes @_rendered_views.rendered_views, view, partial_was_not_rendered_msg

          msg = 'expecting %s to be rendered with %s but was with %s' % [expected_partial,
                                                                         expected_locals,
                                                                         @_rendered_views.locals_for(view)]
          assert(@_rendered_views.view_rendered?(view, options[:locals]), msg)
        else
          warn "the :locals option to #assert_template is only supported in a ActionView::TestCase"
        end
      elsif expected_count = options[:count]
        actual_count = @_partials[expected_partial]
        msg = message || sprintf("expecting %s to be rendered %s time(s) but rendered %s time(s)",
                 expected_partial, expected_count, actual_count)
        assert(actual_count == expected_count.to_i, msg)
      else
        msg = message || sprintf("expecting partial <%s> but action rendered <%s>",
                options[:partial], @_partials.keys)
        assert_includes @_partials, expected_partial, msg
      end
    elsif options.key?(:partial)
      assert @_partials.empty?,
        "Expected no partials to be rendered"
    end
  else
    raise ArgumentError, "assert_template only accepts a String, Symbol, Hash, Regexp, or nil"
  end
end