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 ⇒ Object (readonly) 



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# File 'lib/view_component/test_helpers.rb', line 32

def rendered_content
  @rendered_content
end

Instance Method Details

#build_controller(klass) ⇒ Object 



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# File 'lib/view_component/test_helpers.rb', line 194

def build_controller(klass)
  klass.new.tap { |c| c.request = request }.extend(Rails.application.routes.url_helpers)
end

#controller ⇒ Object 



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# File 'lib/view_component/test_helpers.rb', line 112

def controller
  @controller ||= build_controller(Base.test_controller.constantize)
end

#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:) 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 104

def render_in_view_context(*args, &block)
  @page = nil
  @rendered_content = 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 44

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

  Nokogiri::HTML.fragment(@rendered_content)
end

#render_preview(name, from: 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: 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 75

def render_preview(name, from: preview_class, params: {})
  previews_controller = 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

#request ⇒ Object 



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# File 'lib/view_component/test_helpers.rb', line 117

def request
  @request ||=
    begin
      request = ActionDispatch::TestRequest.create
      request.session = ActionController::TestSession.new
      request
    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 154

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

  @controller = build_controller(klass)
  yield
ensure
  @controller = old_controller
end

#with_request_url(path) ⇒ 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 “`

Parameters:

  • path (String) —

    The path to set for the current request.



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# File 'lib/view_component/test_helpers.rb', line 172

def with_request_url(path)
  old_request_path_info = request.path_info
  old_request_path_parameters = request.path_parameters
  old_request_query_parameters = request.query_parameters
  old_request_query_string = request.query_string
  old_controller = defined?(@controller) && @controller

  path, query = path.split("?", 2)
  request.path_info = path
  request.path_parameters = Rails.application.routes.recognize_path_with_request(request, path, {})
  request.set_header("action_dispatch.request.query_parameters", Rack::Utils.parse_nested_query(query))
  request.set_header(Rack::QUERY_STRING, query)
  yield
ensure
  request.path_info = old_request_path_info
  request.path_parameters = old_request_path_parameters
  request.set_header("action_dispatch.request.query_parameters", old_request_query_parameters)
  request.set_header(Rack::QUERY_STRING, old_request_query_string)
  @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 135

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

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