only run from a jar

Author: jordansissel

spec/jar.rb

@@ -5,6 +5,10 @@
     @jar_root = __FILE__.split("!").first + "!"
   end
 
+  it "must be only run from a jar" do
+    insist { __FILE__ } =~ /file:.*!/
+  end
+
   it "must contain GeoLiteCity.dat" do
     path = File.join(@jar_root, "GeoLiteCity.dat")
     insist { File }.exists?(path)