Add unit test framework for edit command

pkg/kubectl/cmd/testdata/edit/test_editor.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Copyright 2017 The Kubernetes 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.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+# Send the file content to the server
+if command -v curl &>/dev/null; then
+    curl -s -k -XPOST --data-binary "@${1}" -o "${1}.result" "${KUBE_EDITOR_CALLBACK}"
+elif command -v wget &>/dev/null; then
+    wget --post-file="${1}" -O "${1}.result" "${KUBE_EDITOR_CALLBACK}"
+else
+    echo "curl and wget are unavailable" >&2
+    exit 1
+fi
+
+# Use the response as the edited version
+mv "${1}.result" "${1}"