Module: ViewComponent::TestHelpers

Included in:
SystemTestHelpers, TestCase
Defined in:
lib/view_component/test_helpers.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#rendered_content ⇒ ActionView::OutputBuffer (readonly)

Returns the result of a render_inline call.

Returns:

  • (ActionView::OutputBuffer) 


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# File 'lib/view_component/test_helpers.rb', line 34

def rendered_content
  @rendered_content
end

Instance Method Details

#render_in_view_context(*args, &block) ⇒ Object

Execute the given block in the view context (using ‘instance_exec`). Internally sets `page` to be a `Capybara::Node::Simple`, allowing for Capybara assertions to be used. All arguments are forwarded to the block.

“‘ruby render_in_view_context(arg1, arg2: nil) do |arg1, arg2:|

render(MyComponent.new(arg1, arg2))

end

assert_text(“Hello, World!”) “‘



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# File 'lib/view_component/test_helpers.rb', line 106

def render_in_view_context(*args, &block)
  @page = nil
  @rendered_content = vc_test_controller.view_context.instance_exec(*args, &block)
  Nokogiri::HTML.fragment(@rendered_content)
end

#render_inline(component, **args, &block) ⇒ Nokogiri::HTML

Render a component inline. Internally sets ‘page` to be a `Capybara::Node::Simple`, allowing for Capybara assertions to be used:

“‘ruby render_inline(MyComponent.new) assert_text(“Hello, World!”) “`

Parameters:

Returns:

  • (Nokogiri::HTML) 


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# File 'lib/view_component/test_helpers.rb', line 46

def render_inline(component, **args, &block)
  @page = nil
  @rendered_content =
    if Rails.version.to_f >= 6.1
      vc_test_controller.view_context.render(component, args, &block)
    else
      vc_test_controller.view_context.render_component(component, &block)
    end

  Nokogiri::HTML.fragment(@rendered_content)
end

#render_preview(name, from: __vc_test_helpers_preview_class, params: {}) ⇒ Nokogiri::HTML

Render a preview inline. Internally sets ‘page` to be a `Capybara::Node::Simple`, allowing for Capybara assertions to be used:

“‘ruby render_preview(:default) assert_text(“Hello, World!”) “`

Note: ‘#rendered_preview` expects a preview to be defined with the same class name as the calling test, but with `Test` replaced with `Preview`:

MyComponentTest -> MyComponentPreview etc.

In RSpec, ‘Preview` is appended to `described_class`.

Parameters:

  • name (String) —

    The name of the preview to be rendered.

  • from (ViewComponent::Preview) (defaults to: __vc_test_helpers_preview_class) —

    The class of the preview to be rendered.

  • params (Hash) (defaults to: {}) —

    Parameters to be passed to the preview.

Returns:

  • (Nokogiri::HTML) 


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# File 'lib/view_component/test_helpers.rb', line 77

def render_preview(name, from: __vc_test_helpers_preview_class, params: {})
  previews_controller = __vc_test_helpers_build_controller(Rails.application.config.view_component.preview_controller.constantize)

  # From what I can tell, it's not possible to overwrite all request parameters
  # at once, so we set them individually here.
  params.each do |k, v|
    previews_controller.request.params[k] = v
  end

  previews_controller.request.params[:path] = "#{from.preview_name}/#{name}"
  previews_controller.set_response!(ActionDispatch::Response.new)
  result = previews_controller.previews

  @rendered_content = result

  Nokogiri::HTML.fragment(@rendered_content)
end

#vc_test_controller ⇒ ActionController::Base

Access the controller used by ‘render_inline`:

“‘ruby test “logged out user sees login link” do

vc_test_controller.expects(:logged_in?).at_least_once.returns(false)
render_inline(LoginComponent.new)
assert_selector("[aria-label='You must be signed in']")

end “‘

Returns:

  • (ActionController::Base) 


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# File 'lib/view_component/test_helpers.rb', line 204

def vc_test_controller
  @vc_test_controller ||= __vc_test_helpers_build_controller(Base.test_controller.constantize)
end

#vc_test_request ⇒ ActionDispatch::TestRequest

Access the request used by ‘render_inline`:

“‘ruby test “component does not render in Firefox” do

request.env["HTTP_USER_AGENT"] = "Mozilla/5.0"
render_inline(NoFirefoxComponent.new)
refute_component_rendered

end “‘

Returns:

  • (ActionDispatch::TestRequest) 


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# File 'lib/view_component/test_helpers.rb', line 219

def vc_test_request
  @vc_test_request ||=
    begin
      out = ActionDispatch::TestRequest.create
      out.session = ActionController::TestSession.new
      out
    end
end

#with_controller_class(klass) ⇒ Object

Set the controller to be used while executing the given block, allowing access to controller-specific methods:

“‘ruby with_controller_class(UsersController) do

render_inline(MyComponent.new)

end “‘

Parameters:

  • klass (ActionController::Base) —

    The controller to be used.



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# File 'lib/view_component/test_helpers.rb', line 141

def with_controller_class(klass)
  old_controller = defined?(@vc_test_controller) && @vc_test_controller

  @vc_test_controller = __vc_test_helpers_build_controller(klass)
  yield
ensure
  @vc_test_controller = old_controller
end

#with_request_url(path, host: nil) ⇒ Object

Set the URL of the current request (such as when using request-dependent path helpers):

“‘ruby with_request_url(“/users/42”) do

render_inline(MyComponent.new)

end “‘

To use a specific host, pass the host param:

“‘ruby with_request_url(“/users/42”, host: “app.example.com”) do

render_inline(MyComponent.new)

end “‘

Parameters:

  • path (String) —

    The path to set for the current request.

  • host (String) (defaults to: nil) —

    The host to set for the current request.



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# File 'lib/view_component/test_helpers.rb', line 168

def with_request_url(path, host: nil)
  old_request_host = vc_test_request.host
  old_request_path_info = vc_test_request.path_info
  old_request_path_parameters = vc_test_request.path_parameters
  old_request_query_parameters = vc_test_request.query_parameters
  old_request_query_string = vc_test_request.query_string
  old_controller = defined?(@vc_test_controller) && @vc_test_controller

  path, query = path.split("?", 2)
  vc_test_request.host = host if host
  vc_test_request.path_info = path
  vc_test_request.path_parameters = Rails.application.routes.recognize_path_with_request(vc_test_request, path, {})
  vc_test_request.set_header("action_dispatch.request.query_parameters",
    Rack::Utils.parse_nested_query(query).with_indifferent_access)
  vc_test_request.set_header(Rack::QUERY_STRING, query)
  yield
ensure
  vc_test_request.host = old_request_host
  vc_test_request.path_info = old_request_path_info
  vc_test_request.path_parameters = old_request_path_parameters
  vc_test_request.set_header("action_dispatch.request.query_parameters", old_request_query_parameters)
  vc_test_request.set_header(Rack::QUERY_STRING, old_request_query_string)
  @vc_test_controller = old_controller
end

#with_variant(variant) ⇒ Object

Set the Action Pack request variant for the given block:

“‘ruby with_variant(:phone) do

render_inline(MyComponent.new)

end “‘

Parameters:

  • variant (Symbol) —

    The variant to be set for the provided block.



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# File 'lib/view_component/test_helpers.rb', line 122

def with_variant(variant)
  old_variants = vc_test_controller.view_context.lookup_context.variants

  vc_test_controller.view_context.lookup_context.variants = variant
  yield
ensure
  vc_test_controller.view_context.lookup_context.variants = old_variants
end