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// Copyright 2015 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package gensupport
import (
"bytes"
"io"
"io/ioutil"
"reflect"
"testing"
)
func TestContentSniffing(t *testing.T) {
type testCase struct {
data []byte // the data to read from the Reader
finalErr error // error to return after data has been read
wantContentType string
wantContentTypeResult bool
}
for _, tc := range []testCase{
{
data: []byte{0, 0, 0, 0},
finalErr: nil,
wantContentType: "application/octet-stream",
wantContentTypeResult: true,
},
{
data: []byte(""),
finalErr: nil,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: true,
},
{
data: []byte(""),
finalErr: io.ErrUnexpectedEOF,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: false,
},
{
data: []byte("abc"),
finalErr: nil,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: true,
},
{
data: []byte("abc"),
finalErr: io.ErrUnexpectedEOF,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: false,
},
// The following examples contain more bytes than are buffered for sniffing.
{
data: bytes.Repeat([]byte("a"), 513),
finalErr: nil,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: true,
},
{
data: bytes.Repeat([]byte("a"), 513),
finalErr: io.ErrUnexpectedEOF,
wantContentType: "text/plain; charset=utf-8",
wantContentTypeResult: true, // true because error is after first 512 bytes.
},
} {
er := &errReader{buf: tc.data, err: tc.finalErr}
sct := newContentSniffer(er)
// Even if was an error during the first 512 bytes, we should still be able to read those bytes.
buf, err := ioutil.ReadAll(sct)
if !reflect.DeepEqual(buf, tc.data) {
t.Fatalf("Failed reading buffer: got: %q; want:%q", buf, tc.data)
}
if err != tc.finalErr {
t.Fatalf("Reading buffer error: got: %v; want: %v", err, tc.finalErr)
}
ct, ok := sct.ContentType()
if ok != tc.wantContentTypeResult {
t.Fatalf("Content type result got: %v; want: %v", ok, tc.wantContentTypeResult)
}
if ok && ct != tc.wantContentType {
t.Fatalf("Content type got: %q; want: %q", ct, tc.wantContentType)
}
}
}
type staticContentTyper struct {
io.Reader
}
func (sct staticContentTyper) ContentType() string {
return "static content type"
}
func TestDetermineContentType(t *testing.T) {
data := []byte("abc")
rdr := func() io.Reader {
return bytes.NewBuffer(data)
}
type testCase struct {
r io.Reader
explicitConentType string
wantContentType string
}
for _, tc := range []testCase{
{
r: rdr(),
wantContentType: "text/plain; charset=utf-8",
},
{
r: staticContentTyper{rdr()},
wantContentType: "static content type",
},
{
r: staticContentTyper{rdr()},
explicitConentType: "explicit",
wantContentType: "explicit",
},
} {
r, ctype := DetermineContentType(tc.r, tc.explicitConentType)
got, err := ioutil.ReadAll(r)
if err != nil {
t.Fatalf("Failed reading buffer: %v", err)
}
if !reflect.DeepEqual(got, data) {
t.Fatalf("Failed reading buffer: got: %q; want:%q", got, data)
}
if ctype != tc.wantContentType {
t.Fatalf("Content type got: %q; want: %q", ctype, tc.wantContentType)
}
}
}
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