[ruby/rexml] Fix crash with nil XPath variables (#13)

Patch by Alyssa Ross. Thanks!!!
https://github.com/ruby/rexml/commit/2a53c54f58

1 files changed, 19 insertions, 0 deletions

diff --git a/test/rexml/test_functions.rb b/test/rexml/test_functions.rb
index a77be38cc1..c1716ebe1c 100644
--- a/test/rexml/test_functions.rb
+++ b/test/rexml/test_functions.rb
@@ -6,6 +6,12 @@ require "rexml/document"
 module REXMLTests
   class FunctionsTester < Test::Unit::TestCase
     include REXML
+
+    def setup
+      super
+      REXML::Functions.context = nil
+    end
+
     def test_functions
       # trivial text() test
       # confuse-a-function
@@ -222,6 +228,19 @@ module REXMLTests
       assert_equal( [REXML::Comment.new("COMMENT A")], m )
     end
 
+    def test_string_nil_without_context
+      doc = REXML::Document.new(<<-XML)
+      <?xml version="1.0" encoding="UTF-8"?>
+      <root>
+      <foo bar="baz"/>
+      <foo bar=""/>
+      </root>
+      XML
+
+      m = REXML::XPath.match(doc, "//foo[@bar=$n]", nil, { "n" => nil })
+      assert_equal( 1, m.size )
+    end
+
     def test_unregistered_method
       doc = Document.new("<root/>")
       assert_nil(XPath::first(doc.root, "to_s()"))