Resolve expandContext in test suite relative to the manifest location.

Author: gkellogg

spec/suite_helper.rb

@@ -132,6 +132,10 @@ def options
           {'specVersion' => "json-ld-1.1"}.merge(property('option') || {}).each do |k, v|
             opts[k.to_sym] = v
           end
+          if opts[:expandContext] && !RDF::URI(opts[:expandContext]).absolute?
+            # Resolve relative to manifest location
+            opts[:expandContext] = manifest_url.join(opts[:expandContext]).to_s
+          end
           opts
         end
       end