libgo/go/mime/type_test.go

   1 // Copyright 2010 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package mime
   6
   7 import (
   8         "reflect"
   9         "strings"
  10         "sync"
  11         "testing"
  12 )
  13
  14 func setMimeInit(fn func()) (cleanup func()) {
  15         once = sync.Once{}
  16         testInitMime = fn
  17         return func() {
  18                 testInitMime = nil
  19                 once = sync.Once{}
  20         }
  21 }
  22
  23 func clearMimeTypes() {
  24         setMimeTypes(map[string]string{}, map[string]string{})
  25 }
  26
  27 func setType(ext, typ string) {
  28         if !strings.HasPrefix(ext, ".") {
  29                 panic("missing leading dot")
  30         }
  31         if err := setExtensionType(ext, typ); err != nil {
  32                 panic("bad test data: " + err.Error())
  33         }
  34 }
  35
  36 func TestTypeByExtension(t *testing.T) {
  37         once = sync.Once{}
  38         // initMimeForTests returns the platform-specific extension =>
  39         // type tests. On Unix and Plan 9, this also tests the parsing
  40         // of MIME text files (in testdata/*). On Windows, we test the
  41         // real registry on the machine and assume that ".png" exists
  42         // there, which empirically it always has, for all versions of
  43         // Windows.
  44         typeTests := initMimeForTests()
  45
  46         for ext, want := range typeTests {
  47                 val := TypeByExtension(ext)
  48                 if val != want {
  49                         t.Errorf("TypeByExtension(%q) = %q, want %q", ext, val, want)
  50                 }
  51         }
  52 }
  53
  54 func TestTypeByExtension_LocalData(t *testing.T) {
  55         cleanup := setMimeInit(func() {
  56                 clearMimeTypes()
  57                 setType(".foo", "x/foo")
  58                 setType(".bar", "x/bar")
  59                 setType(".Bar", "x/bar; capital=1")
  60         })
  61         defer cleanup()
  62
  63         tests := map[string]string{
  64                 ".foo":          "x/foo",
  65                 ".bar":          "x/bar",
  66                 ".Bar":          "x/bar; capital=1",
  67                 ".sdlkfjskdlfj": "",
  68                 ".t1":           "", // testdata shouldn't be used
  69         }
  70
  71         for ext, want := range tests {
  72                 val := TypeByExtension(ext)
  73                 if val != want {
  74                         t.Errorf("TypeByExtension(%q) = %q, want %q", ext, val, want)
  75                 }
  76         }
  77 }
  78
  79 func TestTypeByExtensionCase(t *testing.T) {
  80         const custom = "test/test; charset=iso-8859-1"
  81         const caps = "test/test; WAS=ALLCAPS"
  82
  83         cleanup := setMimeInit(func() {
  84                 clearMimeTypes()
  85                 setType(".TEST", caps)
  86                 setType(".tesT", custom)
  87         })
  88         defer cleanup()
  89
  90         // case-sensitive lookup
  91         if got := TypeByExtension(".tesT"); got != custom {
  92                 t.Fatalf("for .tesT, got %q; want %q", got, custom)
  93         }
  94         if got := TypeByExtension(".TEST"); got != caps {
  95                 t.Fatalf("for .TEST, got %q; want %s", got, caps)
  96         }
  97
  98         // case-insensitive
  99         if got := TypeByExtension(".TesT"); got != custom {
 100                 t.Fatalf("for .TesT, got %q; want %q", got, custom)
 101         }
 102 }
 103
 104 func TestExtensionsByType(t *testing.T) {
 105         cleanup := setMimeInit(func() {
 106                 clearMimeTypes()
 107                 setType(".gif", "image/gif")
 108                 setType(".a", "foo/letter")
 109                 setType(".b", "foo/letter")
 110                 setType(".B", "foo/letter")
 111                 setType(".PNG", "image/png")
 112         })
 113         defer cleanup()
 114
 115         tests := []struct {
 116                 typ     string
 117                 want    []string
 118                 wantErr string
 119         }{
 120                 {typ: "image/gif", want: []string{".gif"}},
 121                 {typ: "image/png", want: []string{".png"}}, // lowercase
 122                 {typ: "foo/letter", want: []string{".a", ".b"}},
 123                 {typ: "x/unknown", want: nil},
 124         }
 125
 126         for _, tt := range tests {
 127                 got, err := ExtensionsByType(tt.typ)
 128                 if err != nil && tt.wantErr != "" && strings.Contains(err.Error(), tt.wantErr) {
 129                         continue
 130                 }
 131                 if err != nil {
 132                         t.Errorf("ExtensionsByType(%q) error: %v", tt.typ, err)
 133                         continue
 134                 }
 135                 if tt.wantErr != "" {
 136                         t.Errorf("ExtensionsByType(%q) = %q, %v; want error substring %q", tt.typ, got, err, tt.wantErr)
 137                         continue
 138                 }
 139                 if !reflect.DeepEqual(got, tt.want) {
 140                         t.Errorf("ExtensionsByType(%q) = %q; want %q", tt.typ, got, tt.want)
 141                 }
 142         }
 143 }
 144
 145 func TestLookupMallocs(t *testing.T) {
 146         t.Skip("skipping test on gccgo until it has better escape analysis")
 147         n := testing.AllocsPerRun(10000, func() {
 148                 TypeByExtension(".html")
 149                 TypeByExtension(".HtML")
 150         })
 151         if n > 0 {
 152                 t.Errorf("allocs = %v; want 0", n)
 153         }
 154 }
 155
 156 func BenchmarkTypeByExtension(b *testing.B) {
 157         initMime()
 158         b.ResetTimer()
 159
 160         for _, ext := range []string{
 161                 ".html",
 162                 ".HTML",
 163                 ".unused",
 164         } {
 165                 b.Run(ext, func(b *testing.B) {
 166                         b.RunParallel(func(pb *testing.PB) {
 167                                 for pb.Next() {
 168                                         TypeByExtension(ext)
 169                                 }
 170                         })
 171                 })
 172         }
 173 }
 174
 175 func BenchmarkExtensionsByType(b *testing.B) {
 176         initMime()
 177         b.ResetTimer()
 178
 179         for _, typ := range []string{
 180                 "text/html",
 181                 "text/html; charset=utf-8",
 182                 "application/octet-stream",
 183         } {
 184                 b.Run(typ, func(b *testing.B) {
 185                         b.RunParallel(func(pb *testing.PB) {
 186                                 for pb.Next() {
 187                                         if _, err := ExtensionsByType(typ); err != nil {
 188                                                 b.Fatal(err)
 189                                         }
 190                                 }
 191                         })
 192                 })
 193         }
 194 }
 195
 196 func TestExtensionsByType2(t *testing.T) {
 197         cleanup := setMimeInit(func() {
 198                 clearMimeTypes()
 199                 // Initialize built-in types like in type.go before osInitMime.
 200                 setMimeTypes(builtinTypesLower, builtinTypesLower)
 201         })
 202         defer cleanup()
 203
 204         tests := []struct {
 205                 typ  string
 206                 want []string
 207         }{
 208                 {typ: "image/jpeg", want: []string{".jpeg", ".jpg"}},
 209         }
 210
 211         for _, tt := range tests {
 212                 got, err := ExtensionsByType(tt.typ)
 213                 if err != nil {
 214                         t.Errorf("ExtensionsByType(%q): %v", tt.typ, err)
 215                         continue
 216                 }
 217                 if !reflect.DeepEqual(got, tt.want) {
 218                         t.Errorf("ExtensionsByType(%q) = %q; want %q", tt.typ, got, tt.want)
 219                 }
 220         }
 221 }