testing: adds basic test of backwards compatibility

libcni/backwards_compatibility_test.go

@@ -0,0 +1,53 @@
+// Copyright 2016 CNI authors
+//
+// 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 libcni_test
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/containernetworking/cni/libcni"
+	"github.com/containernetworking/cni/pkg/version/legacy_examples"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Backwards compatibility", func() {
+	It("correctly handles the response from a legacy plugin", func() {
+		example := legacy_examples.V010
+		pluginPath, err := example.Build()
+		Expect(err).NotTo(HaveOccurred())
+
+		netConf, err := libcni.ConfFromBytes([]byte(fmt.Sprintf(
+			`{ "name": "old-thing", "type": "%s" }`, example.Name)))
+		Expect(err).NotTo(HaveOccurred())
+
+		runtimeConf := &libcni.RuntimeConf{
+			ContainerID: "some-container-id",
+			NetNS:       "/some/netns/path",
+			IfName:      "eth0",
+		}
+
+		cniConfig := &libcni.CNIConfig{Path: []string{filepath.Dir(pluginPath)}}
+
+		result, err := cniConfig.AddNetwork(netConf, runtimeConf)
+		Expect(err).NotTo(HaveOccurred())
+
+		Expect(result).To(Equal(legacy_examples.ExpectedResult))
+
+		Expect(os.RemoveAll(pluginPath)).To(Succeed())
+	})
+})