Restrict separator as type (#245)

Author: stephannv

lib/ruby_ui/separator/separator.rb

@@ -7,7 +7,7 @@ class Separator < Base
     def initialize(as: :div, orientation: :horizontal, decorative: true, **attrs)
       raise ArgumentError, "Invalid orientation: #{orientation}" unless ORIENTATIONS.include?(orientation.to_sym)
 
-      @as = as.to_sym
+      @as = as
       @orientation = orientation.to_sym
       @decorative = decorative
       super(**attrs)

test/ruby_ui/separator_test.rb

@@ -31,7 +31,7 @@ def test_render_with_decorative_false
 
   def test_render_with_custom_tag
     output = phlex do
-      RubyUI.Separator(as: "hr")
+      RubyUI.Separator(as: :hr)
     end
 
     assert_match(/<hr/, output)