// Copyright 2011 The Go Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package http

import (
	"bytes"
	"testing"
)

var headerWriteTests = []struct {
	h        Header
	exclude  map[string]bool
	expected string
}{
	{Header{}, nil, ""},
	{
		Header{
			"Content-Type":   {"text/html; charset=UTF-8"},
			"Content-Length": {"0"},
		},
		nil,
		"Content-Length: 0\r\nContent-Type: text/html; charset=UTF-8\r\n",
	},
	{
		Header{
			"Content-Length": {"0", "1", "2"},
		},
		nil,
		"Content-Length: 0\r\nContent-Length: 1\r\nContent-Length: 2\r\n",
	},
	{
		Header{
			"Expires":          {"-1"},
			"Content-Length":   {"0"},
			"Content-Encoding": {"gzip"},
		},
		map[string]bool{"Content-Length": true},
		"Content-Encoding: gzip\r\nExpires: -1\r\n",
	},
	{
		Header{
			"Expires":          {"-1"},
			"Content-Length":   {"0", "1", "2"},
			"Content-Encoding": {"gzip"},
		},
		map[string]bool{"Content-Length": true},
		"Content-Encoding: gzip\r\nExpires: -1\r\n",
	},
	{
		Header{
			"Expires":          {"-1"},
			"Content-Length":   {"0"},
			"Content-Encoding": {"gzip"},
		},
		map[string]bool{"Content-Length": true, "Expires": true, "Content-Encoding": true},
		"",
	},
	{
		Header{
			"Nil":          nil,
			"Empty":        {},
			"Blank":        {""},
			"Double-Blank": {"", ""},
		},
		nil,
		"Blank: \r\nDouble-Blank: \r\nDouble-Blank: \r\n",
	},
}

func TestHeaderWrite(t *testing.T) {
	var buf bytes.Buffer
	for i, test := range headerWriteTests {
		test.h.WriteSubset(&buf, test.exclude)
		if buf.String() != test.expected {
			t.Errorf("#%d:\n got: %q\nwant: %q", i, buf.String(), test.expected)
		}
		buf.Reset()
	}
}