Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/redis/files/default/tests/minitest/default_test.rb

@@ -0,0 +1,19 @@
+require_relative "test_helper"
+
+describe_recipe "redis::default" do
+  let(:apt_path) do
+    "/etc/apt/sources.list.d"
+  end
+
+  it "set up an apt repository" do
+    repo = {
+      "debian" => { name: "dotdeb", content: "dotdeb" },
+      "ubuntu" => { name: "chris-lea-redis-server", content: "chris-lea" }
+    }[node["platform"]]
+
+    apt_file = "#{apt_path}/#{repo[:name]}.list"
+
+    file(apt_file).must_exist
+    file(apt_file).must_include repo[:content]
+  end
+end