repo_description: Ingress NGINX Controller for Kubernetes
repo_topics: ingress-controller kubernetes nginx
code: /*
  Copyright 2015 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.
  */
  
  package net
  
  import (
  	"net"
  	"testing"
  )
  
  func TestIsIPV6(t *testing.T) {
  	tests := []struct {
  		in     net.IP
  		isIPV6 bool
  	}{
  		{net.ParseIP("2001:4860:4860::8844"), true},
  		{net.ParseIP("2001:4860:4860::8888"), true},
  		{net.ParseIP("0:0:0:0:0:ffff:c868:8165"), true},
  		{net.ParseIP("2001:db8:85a3::8a2e:370:7334"), true},
  		{net.ParseIP("::1"), true},
  		{net.ParseIP("[REDACTED_IP]"), false},
  	}
  
  	for _, test := range tests {
  		isIPV6 := IsIPV6(test.in)
  		if isIPV6 && !test.isIPV6 {
  			t.Fatalf("%v expected %v but returned %v", test.in, test.isIPV6, isIPV6)
  		}
  	}
  }
  
  func TestIsPortAvailable(t *testing.T) {
  	if !IsPortAvailable(0) {
  		t.Fatal("expected port 0 to be available (random port) but returned false")
  	}
  
  	ln, err := net.Listen("tcp", ":0") //nolint:gosec // Ignore the gosec error in testing
  	if err != nil {
  		t.Fatalf("unexpected error: %v", err)
  	}
  	defer ln.Close()
  
  	p := ln.Addr().(*net.TCPAddr).Port
  	if IsPortAvailable(p) {
  		t.Fatalf("expected port %v to not be available", p)
  	}
  }
  