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// Copyright 2010 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 gzip
import (
"io"
"io/ioutil"
"strings"
"testing"
)
// pipe creates two ends of a pipe that gzip and gunzip, and runs dfunc at the
// writer end and ifunc at the reader end.
func pipe(t *testing.T, dfunc func(*Deflater), ifunc func(*Inflater)) {
piper, pipew := io.Pipe()
defer piper.Close()
go func() {
defer pipew.Close()
deflater, err := NewDeflater(pipew)
if err != nil {
t.Fatalf("%v", err)
}
defer deflater.Close()
dfunc(deflater)
}()
inflater, err := NewInflater(piper)
if err != nil {
t.Fatalf("%v", err)
}
defer inflater.Close()
ifunc(inflater)
}
// Tests that an empty payload still forms a valid GZIP stream.
func TestEmpty(t *testing.T) {
pipe(t,
func(deflater *Deflater) {},
func(inflater *Inflater) {
b, err := ioutil.ReadAll(inflater)
if err != nil {
t.Fatalf("%v", err)
}
if len(b) != 0 {
t.Fatalf("did not read an empty slice")
}
})
}
// Tests that gzipping and then gunzipping is the identity function.
func TestWriter(t *testing.T) {
pipe(t,
func(deflater *Deflater) {
deflater.Comment = "comment"
deflater.Extra = strings.Bytes("extra")
deflater.Mtime = 1e8
deflater.Name = "name"
_, err := deflater.Write(strings.Bytes("payload"))
if err != nil {
t.Fatalf("%v", err)
}
},
func(inflater *Inflater) {
b, err := ioutil.ReadAll(inflater)
if err != nil {
t.Fatalf("%v", err)
}
if string(b) != "payload" {
t.Fatalf("payload is %q, want %q", string(b), "payload")
}
if inflater.Comment != "comment" {
t.Fatalf("comment is %q, want %q", inflater.Comment, "comment")
}
if string(inflater.Extra) != "extra" {
t.Fatalf("extra is %q, want %q", inflater.Extra, "extra")
}
if inflater.Mtime != 1e8 {
t.Fatalf("mtime is %d, want %d", inflater.Mtime, uint32(1e8))
}
if inflater.Name != "name" {
t.Fatalf("name is %q, want %q", inflater.Name, "name")
}
})
}
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