Fix broken tests

lib/yard/cli/yardoc.rb

@@ -659,7 +659,7 @@ def output_options(opts)
         opts.on('--asset FROM[:TO]', 'A file or directory to copy over to output ',
                                      '  directory after generating') do |asset|
           re = %r{^(?:\.\./|/)}
-          from, to = *asset.split(':').map {|f| File.cleanpath(f) }
+          from, to = *asset.split(':').map {|f| File.cleanpath(f, true) }
           to ||= from
           if from =~ re || to =~ re
             log.warn "Invalid file '#{asset}'"

lib/yard/core_ext/file.rb

@@ -32,15 +32,16 @@ def self.relative_path(from, to)
   # @example Clean a path
   #   File.cleanpath('a/b//./c/../e') # => "a/b/e"
   # @param [String] path the path to clean
+  # @param [Boolean] rel_root allows relative path above root value
   # @return [String] the sanitized path
-  def self.cleanpath(path)
+  def self.cleanpath(path, rel_root = false)
     path = path.split(SEPARATOR)
     path = path.inject([]) do |acc, comp|
       next acc if comp == RELATIVE_SAMEDIR
       if comp == RELATIVE_PARENTDIR && !acc.empty? && acc.last != RELATIVE_PARENTDIR
         acc.pop
         next acc
-      elsif comp == RELATIVE_PARENTDIR && acc.empty?
+      elsif !rel_root && comp == RELATIVE_PARENTDIR && acc.empty?
         next acc
       end
       acc << comp

spec/core_ext/file_spec.rb

@@ -41,6 +41,10 @@
       expect(File.cleanpath('A/B/C/D/..')).to eq "A/B/C"
     end
 
+    it "allows '../' at the beginning if rel_root=true" do
+      expect(File.cleanpath('A/../../B', true)).to eq '../B'
+    end
+
     it "does not allow relative path above root" do
       expect(File.cleanpath('A/../../../../../D')).to eq "D"
     end