Implement `yaml_eq' condition keyword

lib/producer/core/tests/yaml_eq.rb

@@ -0,0 +1,12 @@
+module Producer
+  module Core
+    module Tests
+      class YAMLEq < Test
+        def verify
+          return false unless file_content = fs.file_read(arguments.first)
+          YAML.load(file_content) == arguments[1]
+        end
+      end
+    end
+  end
+end