code review 12387044: compress/bzip2: support concatenated files

src/pkg/compress/gzip/gzip_test.go

 // 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 (
         "bufio"
         "bytes"
         "io/ioutil"
@@ skipping 179 matching lines @@
 
         if err := w.Flush(); err != nil {
                 t.Fatal(err)
         }
 
         n3 := buf.Len()
         if n2 == n3 {
                 t.Fatal("Flush didn't flush any data")
         }
 }
+
+// Multiple gzip files concatenated form a valid gzip file.
+func TestConcat(t *testing.T) {
+        var buf bytes.Buffer
+        w := NewWriter(&buf)
+        w.Write([]byte("hello "))
+        w.Close()
+        w = NewWriter(&buf)
+        w.Write([]byte("world\n"))
+        w.Close()
+
+        r, err := NewReader(&buf)
+        data, err := ioutil.ReadAll(r)
+        if string(data) != "hello world\n" || err != nil {
+                t.Fatalf("ReadAll = %q, %v, want %q, nil", data, err, "hello world")
+        }
+}