pkg/invoke: add unit test for env var ordering in Args.AsEnv

diff --git a/pkg/invoke/args_test.go b/pkg/invoke/args_test.go
new file mode 100644 (file)
index 0000000..cc55823
--- /dev/null
+++ b/pkg/invoke/args_test.go
@@ -0,0 +1,60 @@
+// Copyright 2017 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 invoke_test
+
+import (
+       "os"
+
+       "github.com/containernetworking/cni/pkg/invoke"
+
+       . "github.com/onsi/ginkgo"
+       . "github.com/onsi/gomega"
+)
+
+var _ = Describe("Args", func() {
+       Describe("AsEnv", func() {
+               It("places the CNI_ environment variables ahead of any ambient variables", func() {
+                       args := invoke.Args{
+                               Command:     "ADD",
+                               ContainerID: "some-container-id",
+                               NetNS:       "/some/netns/path",
+                               PluginArgs: [][2]string{
+                                       [2]string{"KEY1", "VALUE1"},
+                                       [2]string{"KEY2", "VALUE2"},
+                               },
+                               IfName: "eth7",
+                               Path:   "/some/cni/path",
+                       }
+                       const numCNIEnvVars = 6
+
+                       latentVars := os.Environ()
+
+                       cniEnv := args.AsEnv()
+                       Expect(cniEnv).To(HaveLen(len(latentVars) + numCNIEnvVars))
+                       Expect(cniEnv[0:numCNIEnvVars]).To(Equal([]string{
+                               "CNI_COMMAND=ADD",
+                               "CNI_CONTAINERID=some-container-id",
+                               "CNI_NETNS=/some/netns/path",
+                               "CNI_ARGS=KEY1=VALUE1;KEY2=VALUE2",
+                               "CNI_IFNAME=eth7",
+                               "CNI_PATH=/some/cni/path",
+                       }))
+
+                       for i := range latentVars {
+                               Expect(cniEnv[numCNIEnvVars+i]).To(Equal(latentVars[i]))
+                       }
+               })
+       })
+})