add ip validation to componentconfig command line

pkg/apis/componentconfig/helpers_test.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2016 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 componentconfig
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/spf13/pflag"
+)
+
+func TestIPVar(t *testing.T) {
+	defaultIP := "0.0.0.0"
+	cases := []struct {
+		argc      string
+		expectErr bool
+		expectVal string
+	}{
+
+		{
+			argc:      "blah --ip=1.2.3.4",
+			expectVal: "1.2.3.4",
+		},
+		{
+			argc:      "blah --ip=1.2.3.4a",
+			expectErr: true,
+			expectVal: defaultIP,
+		},
+	}
+	for _, c := range cases {
+		fs := pflag.NewFlagSet("blah", pflag.PanicOnError)
+		ip := defaultIP
+		fs.Var(IPVar{&ip}, "ip", "the ip")
+
+		var err error
+		func() {
+			defer func() {
+				if r := recover(); r != nil {
+					err = r.(error)
+				}
+			}()
+			fs.Parse(strings.Split(c.argc, " "))
+		}()
+
+		if c.expectErr && err == nil {
+			t.Errorf("did not observe an expected error")
+			continue
+		}
+		if !c.expectErr && err != nil {
+			t.Errorf("observed an unexpected error")
+			continue
+		}
+		if c.expectVal != ip {
+			t.Errorf("unexpected ip: expected %q, saw %q", c.expectVal, ip)
+		}
+	}
+}