Newer rubies don't have test-unit by default (and that's a good thing).

Author: djanowski

redis.gemspec

@@ -40,4 +40,5 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
 
   s.add_development_dependency("rake")
+  s.add_development_dependency("test-unit")
 end