Extra type validation for XML::Element options.

lib/oga.rb

@@ -17,7 +17,6 @@ end
 #:nocov:
 
 require_relative 'oga/xml/node'
-require_relative 'oga/xml/element'
 require_relative 'oga/xml/document'
 require_relative 'oga/xml/text'
 require_relative 'oga/xml/comment'
@@ -26,6 +25,7 @@ require_relative 'oga/xml/xml_declaration'
 require_relative 'oga/xml/doctype'
 require_relative 'oga/xml/attribute'
 require_relative 'oga/xml/namespace'
+require_relative 'oga/xml/element'
 require_relative 'oga/xml/node_set'
 
 require_relative 'oga/html/parser'

lib/oga/xml/element.rb

@@ -19,6 +19,17 @@ module Oga
     class Element < Node
       attr_accessor :name, :namespace, :attributes
 
+      ##
+      # List of options that can be passed to the constructor and the required
+      # types of their values.
+      #
+      # @return [Hash]
+      #
+      OPTION_TYPES = {
+        :namespace  => Namespace,
+        :attributes => Array
+      }
+
       ##
       # @param [Hash] options
       #
@@ -31,12 +42,7 @@ module Oga
       #  of the element as an Array.
       #
       def initialize(options = {})
-        if options[:namespace] and !options[:namespace].is_a?(Namespace)
-          raise(
-            TypeError,
-            ':namespace must be an instance of Oga::XML::Namespace'
-          )
-        end
+        validate_option_types!(options)
 
         super
 
@@ -141,6 +147,21 @@ module Oga
 
       private
 
+      ##
+      # @param [Hash] options
+      # @raise [TypeError]
+      #
+      def validate_option_types!(options)
+        OPTION_TYPES.each do |key, type|
+          if options[key] and !options[key].is_a?(type)
+            raise(
+              TypeError,
+              "#{key.inspect} must be an instance of #{type}"
+            )
+          end
+        end
+      end
+
       ##
       # @param [String] name
       # @return [Array]

spec/oga/xml/element_spec.rb

@@ -6,12 +6,18 @@ describe Oga::XML::Element do
       described_class.new(:name => 'p').name.should == 'p'
     end
 
-    example 'raise TypeError when the namespace is a String' do
+    example 'raise TypeError when the namespace is not a Namespace' do
       block = lambda { described_class.new(:namespace => 'x') }
 
       block.should raise_error(TypeError)
     end
 
+    example 'raise TypeError when the attributes are not an Array' do
+      block = lambda { described_class.new(:attributes => 'foo') }
+
+      block.should raise_error(TypeError)
+    end
+
     example 'set the name via a setter' do
       instance = described_class.new
       instance.name = 'p'