Provide a JSON and YAML serializer, and a versioning wrapper

Add a recognizer that is capable of sniffing content type from data by
asking each serializer to try to decode - this is for a "universal
decoder/deserializer" which can be used by client logic.

Add codec factory, which provides the core primitives for content type
negotiation. Codec factories depend only on schemes, serializers, and
groupversion pairs.

pkg/runtime/serializer/json/meta_test.go

@@ -0,0 +1,45 @@
+/*
+Copyright 2014 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package json
+
+import "testing"
+
+func TestSimpleMetaFactoryInterpret(t *testing.T) {
+	factory := SimpleMetaFactory{}
+	gvk, err := factory.Interpret([]byte(`{"apiVersion":"1","kind":"object"}`))
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if gvk.Version != "1" || gvk.Kind != "object" {
+		t.Errorf("unexpected interpret: %#v", gvk)
+	}
+
+	// no kind or version
+	gvk, err = factory.Interpret([]byte(`{}`))
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if gvk.Version != "" || gvk.Kind != "" {
+		t.Errorf("unexpected interpret: %#v", gvk)
+	}
+
+	// unparsable
+	gvk, err = factory.Interpret([]byte(`{`))
+	if err == nil {
+		t.Errorf("unexpected non-error")
+	}
+}