Assign locals context-wide when testing partials with rspec-rails

rails_helper.rb

RSpec.configure do |config|
  config.include TemplateLocals, type: :view
end

template_locals.rb

module TemplateLocals
  def assign_locals(locals)
    @_default_locals = _default_locals.merge locals
  end

  private

  def _default_locals
    @_default_locals || {}
  end

  def _default_render_options
    super.merge locals: _default_locals
  end
end