Add test for exception being raised from an XML::Builder block

Co-authored-by: Joana Tavares <jtavares@salsify.com>

test/xml/test_builder.rb

@@ -22,6 +22,29 @@ def test_builder_multiple_nodes
         end
       end
 
+      def test_builder_resilient_to_exceptions
+        builder = Nokogiri::XML::Builder.new do |xml|
+          xml.root do
+            begin
+              xml.a { raise "badjoras" }
+            rescue StandardError
+              # Ignored
+            end
+
+            xml.b
+          end
+        end
+
+        expected_output = <<~HEREDOC
+          <?xml version="1.0"?>
+          <root>
+            <a/>
+            <b/>
+          </root>
+        HEREDOC
+        assert_equal(expected_output, builder.to_xml)
+      end
+
       def test_builder_with_utf8_text
         text = "test ﺵ "
         doc = Nokogiri::XML::Builder.new(encoding: "UTF-8") { |xml| xml.test(text) }.doc