libgo/go/mime/mediatype_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         "testing"
  11 )
  12
  13 func TestConsumeToken(t *testing.T) {
  14         tests := [...][3]string{
  15                 {"foo bar", "foo", " bar"},
  16                 {"bar", "bar", ""},
  17                 {"", "", ""},
  18                 {" foo", "", " foo"},
  19         }
  20         for _, test := range tests {
  21                 token, rest := consumeToken(test[0])
  22                 expectedToken := test[1]
  23                 expectedRest := test[2]
  24                 if token != expectedToken {
  25                         t.Errorf("expected to consume token '%s', not '%s' from '%s'",
  26                                 expectedToken, token, test[0])
  27                 } else if rest != expectedRest {
  28                         t.Errorf("expected to have left '%s', not '%s' after reading token '%s' from '%s'",
  29                                 expectedRest, rest, token, test[0])
  30                 }
  31         }
  32 }
  33
  34 func TestConsumeValue(t *testing.T) {
  35         tests := [...][3]string{
  36                 {"foo bar", "foo", " bar"},
  37                 {"bar", "bar", ""},
  38                 {" bar ", "", " bar "},
  39                 {`"My value"end`, "My value", "end"},
  40                 {`"My value" end`, "My value", " end"},
  41                 {`"\\" rest`, "\\", " rest"},
  42                 {`"My \" value"end`, "My \" value", "end"},
  43                 {`"\" rest`, "", `"\" rest`},
  44                 {`"C:\dev\go\robots.txt"`, `C:\dev\go\robots.txt`, ""},
  45                 {`"C:\新建文件夹\中文第二次测试.mp4"`, `C:\新建文件夹\中文第二次测试.mp4`, ""},
  46         }
  47         for _, test := range tests {
  48                 value, rest := consumeValue(test[0])
  49                 expectedValue := test[1]
  50                 expectedRest := test[2]
  51                 if value != expectedValue {
  52                         t.Errorf("expected to consume value [%s], not [%s] from [%s]",
  53                                 expectedValue, value, test[0])
  54                 } else if rest != expectedRest {
  55                         t.Errorf("expected to have left [%s], not [%s] after reading value [%s] from [%s]",
  56                                 expectedRest, rest, value, test[0])
  57                 }
  58         }
  59 }
  60
  61 func TestConsumeMediaParam(t *testing.T) {
  62         tests := [...][4]string{
  63                 {" ; foo=bar", "foo", "bar", ""},
  64                 {"; foo=bar", "foo", "bar", ""},
  65                 {";foo=bar", "foo", "bar", ""},
  66                 {";FOO=bar", "foo", "bar", ""},
  67                 {`;foo="bar"`, "foo", "bar", ""},
  68                 {`;foo="bar"; `, "foo", "bar", "; "},
  69                 {`;foo="bar"; foo=baz`, "foo", "bar", "; foo=baz"},
  70                 {` ; boundary=----CUT;`, "boundary", "----CUT", ";"},
  71                 {` ; key=value;  blah="value";name="foo" `, "key", "value", `;  blah="value";name="foo" `},
  72                 {`;  blah="value";name="foo" `, "blah", "value", `;name="foo" `},
  73                 {`;name="foo" `, "name", "foo", ` `},
  74         }
  75         for _, test := range tests {
  76                 param, value, rest := consumeMediaParam(test[0])
  77                 expectedParam := test[1]
  78                 expectedValue := test[2]
  79                 expectedRest := test[3]
  80                 if param != expectedParam {
  81                         t.Errorf("expected to consume param [%s], not [%s] from [%s]",
  82                                 expectedParam, param, test[0])
  83                 } else if value != expectedValue {
  84                         t.Errorf("expected to consume value [%s], not [%s] from [%s]",
  85                                 expectedValue, value, test[0])
  86                 } else if rest != expectedRest {
  87                         t.Errorf("expected to have left [%s], not [%s] after reading [%s/%s] from [%s]",
  88                                 expectedRest, rest, param, value, test[0])
  89                 }
  90         }
  91 }
  92
  93 type mediaTypeTest struct {
  94         in string
  95         t  string
  96         p  map[string]string
  97 }
  98
  99 func TestParseMediaType(t *testing.T) {
 100         // Convenience map initializer
 101         m := func(s ...string) map[string]string {
 102                 sm := make(map[string]string)
 103                 for i := 0; i < len(s); i += 2 {
 104                         sm[s[i]] = s[i+1]
 105                 }
 106                 return sm
 107         }
 108
 109         nameFoo := map[string]string{"name": "foo"}
 110         tests := []mediaTypeTest{
 111                 {`form-data; name="foo"`, "form-data", nameFoo},
 112                 {` form-data ; name=foo`, "form-data", nameFoo},
 113                 {`FORM-DATA;name="foo"`, "form-data", nameFoo},
 114                 {` FORM-DATA ; name="foo"`, "form-data", nameFoo},
 115                 {` FORM-DATA ; name="foo"`, "form-data", nameFoo},
 116
 117                 {`form-data; key=value;  blah="value";name="foo" `,
 118                         "form-data",
 119                         m("key", "value", "blah", "value", "name", "foo")},
 120
 121                 {`foo; key=val1; key=the-key-appears-again-which-is-bogus`,
 122                         "", m()},
 123
 124                 // From RFC 2231:
 125                 {`application/x-stuff; title*=us-ascii'en-us'This%20is%20%2A%2A%2Afun%2A%2A%2A`,
 126                         "application/x-stuff",
 127                         m("title", "This is ***fun***")},
 128
 129                 {`message/external-body; access-type=URL; ` +
 130                         `URL*0="ftp://";` +
 131                         `URL*1="cs.utk.edu/pub/moore/bulk-mailer/bulk-mailer.tar"`,
 132                         "message/external-body",
 133                         m("access-type", "URL",
 134                                 "url", "ftp://cs.utk.edu/pub/moore/bulk-mailer/bulk-mailer.tar")},
 135
 136                 {`application/x-stuff; ` +
 137                         `title*0*=us-ascii'en'This%20is%20even%20more%20; ` +
 138                         `title*1*=%2A%2A%2Afun%2A%2A%2A%20; ` +
 139                         `title*2="isn't it!"`,
 140                         "application/x-stuff",
 141                         m("title", "This is even more ***fun*** isn't it!")},
 142
 143                 // Tests from http://greenbytes.de/tech/tc2231/
 144                 // Note: Backslash escape handling is a bit loose, like MSIE.
 145
 146                 // #attonly
 147                 {`attachment`,
 148                         "attachment",
 149                         m()},
 150                 // #attonlyucase
 151                 {`ATTACHMENT`,
 152                         "attachment",
 153                         m()},
 154                 // #attwithasciifilename
 155                 {`attachment; filename="foo.html"`,
 156                         "attachment",
 157                         m("filename", "foo.html")},
 158                 // #attwithasciifilename25
 159                 {`attachment; filename="0000000000111111111122222"`,
 160                         "attachment",
 161                         m("filename", "0000000000111111111122222")},
 162                 // #attwithasciifilename35
 163                 {`attachment; filename="00000000001111111111222222222233333"`,
 164                         "attachment",
 165                         m("filename", "00000000001111111111222222222233333")},
 166                 // #attwithasciifnescapedchar
 167                 {`attachment; filename="f\oo.html"`,
 168                         "attachment",
 169                         m("filename", "f\\oo.html")},
 170                 // #attwithasciifnescapedquote
 171                 {`attachment; filename="\"quoting\" tested.html"`,
 172                         "attachment",
 173                         m("filename", `"quoting" tested.html`)},
 174                 // #attwithquotedsemicolon
 175                 {`attachment; filename="Here's a semicolon;.html"`,
 176                         "attachment",
 177                         m("filename", "Here's a semicolon;.html")},
 178                 // #attwithfilenameandextparam
 179                 {`attachment; foo="bar"; filename="foo.html"`,
 180                         "attachment",
 181                         m("foo", "bar", "filename", "foo.html")},
 182                 // #attwithfilenameandextparamescaped
 183                 {`attachment; foo="\"\\";filename="foo.html"`,
 184                         "attachment",
 185                         m("foo", "\"\\", "filename", "foo.html")},
 186                 // #attwithasciifilenameucase
 187                 {`attachment; FILENAME="foo.html"`,
 188                         "attachment",
 189                         m("filename", "foo.html")},
 190                 // #attwithasciifilenamenq
 191                 {`attachment; filename=foo.html`,
 192                         "attachment",
 193                         m("filename", "foo.html")},
 194                 // #attwithasciifilenamenqs
 195                 {`attachment; filename=foo.html ;`,
 196                         "attachment",
 197                         m("filename", "foo.html")},
 198                 // #attwithfntokensq
 199                 {`attachment; filename='foo.html'`,
 200                         "attachment",
 201                         m("filename", "'foo.html'")},
 202                 // #attwithisofnplain
 203                 {`attachment; filename="foo-ä.html"`,
 204                         "attachment",
 205                         m("filename", "foo-ä.html")},
 206                 // #attwithutf8fnplain
 207                 {`attachment; filename="foo-Ã¤.html"`,
 208                         "attachment",
 209                         m("filename", "foo-Ã¤.html")},
 210                 // #attwithfnrawpctenca
 211                 {`attachment; filename="foo-%41.html"`,
 212                         "attachment",
 213                         m("filename", "foo-%41.html")},
 214                 // #attwithfnusingpct
 215                 {`attachment; filename="50%.html"`,
 216                         "attachment",
 217                         m("filename", "50%.html")},
 218                 // #attwithfnrawpctencaq
 219                 {`attachment; filename="foo-%\41.html"`,
 220                         "attachment",
 221                         m("filename", "foo-%\\41.html")},
 222                 // #attwithnamepct
 223                 {`attachment; name="foo-%41.html"`,
 224                         "attachment",
 225                         m("name", "foo-%41.html")},
 226                 // #attwithfilenamepctandiso
 227                 {`attachment; name="ä-%41.html"`,
 228                         "attachment",
 229                         m("name", "ä-%41.html")},
 230                 // #attwithfnrawpctenclong
 231                 {`attachment; filename="foo-%c3%a4-%e2%82%ac.html"`,
 232                         "attachment",
 233                         m("filename", "foo-%c3%a4-%e2%82%ac.html")},
 234                 // #attwithasciifilenamews1
 235                 {`attachment; filename ="foo.html"`,
 236                         "attachment",
 237                         m("filename", "foo.html")},
 238                 // #attmissingdisposition
 239                 {`filename=foo.html`,
 240                         "", m()},
 241                 // #attmissingdisposition2
 242                 {`x=y; filename=foo.html`,
 243                         "", m()},
 244                 // #attmissingdisposition3
 245                 {`"foo; filename=bar;baz"; filename=qux`,
 246                         "", m()},
 247                 // #attmissingdisposition4
 248                 {`filename=foo.html, filename=bar.html`,
 249                         "", m()},
 250                 // #emptydisposition
 251                 {`; filename=foo.html`,
 252                         "", m()},
 253                 // #doublecolon
 254                 {`: inline; attachment; filename=foo.html`,
 255                         "", m()},
 256                 // #attandinline
 257                 {`inline; attachment; filename=foo.html`,
 258                         "", m()},
 259                 // #attandinline2
 260                 {`attachment; inline; filename=foo.html`,
 261                         "", m()},
 262                 // #attbrokenquotedfn
 263                 {`attachment; filename="foo.html".txt`,
 264                         "", m()},
 265                 // #attbrokenquotedfn2
 266                 {`attachment; filename="bar`,
 267                         "", m()},
 268                 // #attbrokenquotedfn3
 269                 {`attachment; filename=foo"bar;baz"qux`,
 270                         "", m()},
 271                 // #attmultinstances
 272                 {`attachment; filename=foo.html, attachment; filename=bar.html`,
 273                         "", m()},
 274                 // #attmissingdelim
 275                 {`attachment; foo=foo filename=bar`,
 276                         "", m()},
 277                 // #attmissingdelim2
 278                 {`attachment; filename=bar foo=foo`,
 279                         "", m()},
 280                 // #attmissingdelim3
 281                 {`attachment filename=bar`,
 282                         "", m()},
 283                 // #attreversed
 284                 {`filename=foo.html; attachment`,
 285                         "", m()},
 286                 // #attconfusedparam
 287                 {`attachment; xfilename=foo.html`,
 288                         "attachment",
 289                         m("xfilename", "foo.html")},
 290                 // #attcdate
 291                 {`attachment; creation-date="Wed, 12 Feb 1997 16:29:51 -0500"`,
 292                         "attachment",
 293                         m("creation-date", "Wed, 12 Feb 1997 16:29:51 -0500")},
 294                 // #attmdate
 295                 {`attachment; modification-date="Wed, 12 Feb 1997 16:29:51 -0500"`,
 296                         "attachment",
 297                         m("modification-date", "Wed, 12 Feb 1997 16:29:51 -0500")},
 298                 // #dispext
 299                 {`foobar`, "foobar", m()},
 300                 // #dispextbadfn
 301                 {`attachment; example="filename=example.txt"`,
 302                         "attachment",
 303                         m("example", "filename=example.txt")},
 304                 // #attwithfn2231utf8
 305                 {`attachment; filename*=UTF-8''foo-%c3%a4-%e2%82%ac.html`,
 306                         "attachment",
 307                         m("filename", "foo-ä-€.html")},
 308                 // #attwithfn2231noc
 309                 {`attachment; filename*=''foo-%c3%a4-%e2%82%ac.html`,
 310                         "attachment",
 311                         m()},
 312                 // #attwithfn2231utf8comp
 313                 {`attachment; filename*=UTF-8''foo-a%cc%88.html`,
 314                         "attachment",
 315                         m("filename", "foo-ä.html")},
 316                 // #attwithfn2231ws2
 317                 {`attachment; filename*= UTF-8''foo-%c3%a4.html`,
 318                         "attachment",
 319                         m("filename", "foo-ä.html")},
 320                 // #attwithfn2231ws3
 321                 {`attachment; filename* =UTF-8''foo-%c3%a4.html`,
 322                         "attachment",
 323                         m("filename", "foo-ä.html")},
 324                 // #attwithfn2231quot
 325                 {`attachment; filename*="UTF-8''foo-%c3%a4.html"`,
 326                         "attachment",
 327                         m("filename", "foo-ä.html")},
 328                 // #attwithfn2231quot2
 329                 {`attachment; filename*="foo%20bar.html"`,
 330                         "attachment",
 331                         m()},
 332                 // #attwithfn2231singleqmissing
 333                 {`attachment; filename*=UTF-8'foo-%c3%a4.html`,
 334                         "attachment",
 335                         m()},
 336                 // #attwithfn2231nbadpct1
 337                 {`attachment; filename*=UTF-8''foo%`,
 338                         "attachment",
 339                         m()},
 340                 // #attwithfn2231nbadpct2
 341                 {`attachment; filename*=UTF-8''f%oo.html`,
 342                         "attachment",
 343                         m()},
 344                 // #attwithfn2231dpct
 345                 {`attachment; filename*=UTF-8''A-%2541.html`,
 346                         "attachment",
 347                         m("filename", "A-%41.html")},
 348                 // #attfncont
 349                 {`attachment; filename*0="foo."; filename*1="html"`,
 350                         "attachment",
 351                         m("filename", "foo.html")},
 352                 // #attfncontenc
 353                 {`attachment; filename*0*=UTF-8''foo-%c3%a4; filename*1=".html"`,
 354                         "attachment",
 355                         m("filename", "foo-ä.html")},
 356                 // #attfncontlz
 357                 {`attachment; filename*0="foo"; filename*01="bar"`,
 358                         "attachment",
 359                         m("filename", "foo")},
 360                 // #attfncontnc
 361                 {`attachment; filename*0="foo"; filename*2="bar"`,
 362                         "attachment",
 363                         m("filename", "foo")},
 364                 // #attfnconts1
 365                 {`attachment; filename*1="foo."; filename*2="html"`,
 366                         "attachment", m()},
 367                 // #attfncontord
 368                 {`attachment; filename*1="bar"; filename*0="foo"`,
 369                         "attachment",
 370                         m("filename", "foobar")},
 371                 // #attfnboth
 372                 {`attachment; filename="foo-ae.html"; filename*=UTF-8''foo-%c3%a4.html`,
 373                         "attachment",
 374                         m("filename", "foo-ä.html")},
 375                 // #attfnboth2
 376                 {`attachment; filename*=UTF-8''foo-%c3%a4.html; filename="foo-ae.html"`,
 377                         "attachment",
 378                         m("filename", "foo-ä.html")},
 379                 // #attfnboth3
 380                 {`attachment; filename*0*=ISO-8859-15''euro-sign%3d%a4; filename*=ISO-8859-1''currency-sign%3d%a4`,
 381                         "attachment",
 382                         m()},
 383                 // #attnewandfn
 384                 {`attachment; foobar=x; filename="foo.html"`,
 385                         "attachment",
 386                         m("foobar", "x", "filename", "foo.html")},
 387
 388                 // Browsers also just send UTF-8 directly without RFC 2231,
 389                 // at least when the source page is served with UTF-8.
 390                 {`form-data; firstname="Брэд"; lastname="Фицпатрик"`,
 391                         "form-data",
 392                         m("firstname", "Брэд", "lastname", "Фицпатрик")},
 393
 394                 // Empty string used to be mishandled.
 395                 {`foo; bar=""`, "foo", m("bar", "")},
 396
 397                 // Microsoft browsers in intranet mode do not think they need to escape \ in file name.
 398                 {`form-data; name="file"; filename="C:\dev\go\robots.txt"`, "form-data", m("name", "file", "filename", `C:\dev\go\robots.txt`)},
 399                 {`form-data; name="file"; filename="C:\新建文件夹\中文第二次测试.mp4"`, "form-data", m("name", "file", "filename", `C:\新建文件夹\中文第二次测试.mp4`)},
 400
 401                 // issue #46323 (https://github.com/golang/go/issues/46323)
 402                 {
 403                         // example from rfc2231-p.3 (https://datatracker.ietf.org/doc/html/rfc2231)
 404                         `message/external-body; access-type=URL;
 405                 URL*0="ftp://";
 406                 URL*1="cs.utk.edu/pub/moore/bulk-mailer/bulk-mailer.tar";`, // <-- trailing semicolon
 407                         `message/external-body`,
 408                         m("access-type", "URL", "url", "ftp://cs.utk.edu/pub/moore/bulk-mailer/bulk-mailer.tar"),
 409                 },
 410         }
 411
 412         for _, test := range tests {
 413                 mt, params, err := ParseMediaType(test.in)
 414                 if err != nil {
 415                         if test.t != "" {
 416                                 t.Errorf("for input %#q, unexpected error: %v", test.in, err)
 417                                 continue
 418                         }
 419                         continue
 420                 }
 421                 if g, e := mt, test.t; g != e {
 422                         t.Errorf("for input %#q, expected type %q, got %q",
 423                                 test.in, e, g)
 424                         continue
 425                 }
 426                 if len(params) == 0 && len(test.p) == 0 {
 427                         continue
 428                 }
 429                 if !reflect.DeepEqual(params, test.p) {
 430                         t.Errorf("for input %#q, wrong params.\n"+
 431                                 "expected: %#v\n"+
 432                                 "     got: %#v",
 433                                 test.in, test.p, params)
 434                 }
 435         }
 436 }
 437
 438 type badMediaTypeTest struct {
 439         in  string
 440         mt  string
 441         err string
 442 }
 443
 444 var badMediaTypeTests = []badMediaTypeTest{
 445         {"bogus ;=========", "bogus", "mime: invalid media parameter"},
 446         // The following example is from real email delivered by gmail (error: missing semicolon)
 447         // and it is there to check behavior described in #19498
 448         {"application/pdf; x-mac-type=\"3F3F3F3F\"; x-mac-creator=\"3F3F3F3F\" name=\"a.pdf\";",
 449                 "application/pdf", "mime: invalid media parameter"},
 450         {"bogus/<script>alert</script>", "", "mime: expected token after slash"},
 451         {"bogus/bogus<script>alert</script>", "", "mime: unexpected content after media subtype"},
 452         // Tests from http://greenbytes.de/tech/tc2231/
 453         {`"attachment"`, "attachment", "mime: no media type"},
 454         {"attachment; filename=foo,bar.html", "attachment", "mime: invalid media parameter"},
 455         {"attachment; ;filename=foo", "attachment", "mime: invalid media parameter"},
 456         {"attachment; filename=foo bar.html", "attachment", "mime: invalid media parameter"},
 457         {`attachment; filename="foo.html"; filename="bar.html"`, "attachment", "mime: duplicate parameter name"},
 458         {"attachment; filename=foo[1](2).html", "attachment", "mime: invalid media parameter"},
 459         {"attachment; filename=foo-ä.html", "attachment", "mime: invalid media parameter"},
 460         {"attachment; filename=foo-Ã¤.html", "attachment", "mime: invalid media parameter"},
 461         {`attachment; filename *=UTF-8''foo-%c3%a4.html`, "attachment", "mime: invalid media parameter"},
 462 }
 463
 464 func TestParseMediaTypeBogus(t *testing.T) {
 465         for _, tt := range badMediaTypeTests {
 466                 mt, params, err := ParseMediaType(tt.in)
 467                 if err == nil {
 468                         t.Errorf("ParseMediaType(%q) = nil error; want parse error", tt.in)
 469                         continue
 470                 }
 471                 if err.Error() != tt.err {
 472                         t.Errorf("ParseMediaType(%q) = err %q; want %q", tt.in, err.Error(), tt.err)
 473                 }
 474                 if params != nil {
 475                         t.Errorf("ParseMediaType(%q): got non-nil params on error", tt.in)
 476                 }
 477                 if err != ErrInvalidMediaParameter && mt != "" {
 478                         t.Errorf("ParseMediaType(%q): got unexpected non-empty media type string", tt.in)
 479                 }
 480                 if err == ErrInvalidMediaParameter && mt != tt.mt {
 481                         t.Errorf("ParseMediaType(%q): in case of invalid parameters: expected type %q, got %q", tt.in, tt.mt, mt)
 482                 }
 483         }
 484 }
 485
 486 type formatTest struct {
 487         typ    string
 488         params map[string]string
 489         want   string
 490 }
 491
 492 var formatTests = []formatTest{
 493         {"noslash", map[string]string{"X": "Y"}, "noslash; x=Y"}, // e.g. Content-Disposition values (RFC 2183); issue 11289
 494         {"foo bar/baz", nil, ""},
 495         {"foo/bar baz", nil, ""},
 496         {"attachment", map[string]string{"filename": "ĄĄŽŽČČŠŠ"}, "attachment; filename*=utf-8''%C4%84%C4%84%C5%BD%C5%BD%C4%8C%C4%8C%C5%A0%C5%A0"},
 497         {"attachment", map[string]string{"filename": "ÁÁÊÊÇÇÎÎ"}, "attachment; filename*=utf-8''%C3%81%C3%81%C3%8A%C3%8A%C3%87%C3%87%C3%8E%C3%8E"},
 498         {"attachment", map[string]string{"filename": "数据统计.png"}, "attachment; filename*=utf-8''%E6%95%B0%E6%8D%AE%E7%BB%9F%E8%AE%A1.png"},
 499         {"foo/BAR", nil, "foo/bar"},
 500         {"foo/BAR", map[string]string{"X": "Y"}, "foo/bar; x=Y"},
 501         {"foo/BAR", map[string]string{"space": "With space"}, `foo/bar; space="With space"`},
 502         {"foo/BAR", map[string]string{"quote": `With "quote`}, `foo/bar; quote="With \"quote"`},
 503         {"foo/BAR", map[string]string{"bslash": `With \backslash`}, `foo/bar; bslash="With \\backslash"`},
 504         {"foo/BAR", map[string]string{"both": `With \backslash and "quote`}, `foo/bar; both="With \\backslash and \"quote"`},
 505         {"foo/BAR", map[string]string{"": "empty attribute"}, ""},
 506         {"foo/BAR", map[string]string{"bad attribute": "baz"}, ""},
 507         {"foo/BAR", map[string]string{"nonascii": "not an ascii character: ä"}, "foo/bar; nonascii*=utf-8''not%20an%20ascii%20character%3A%20%C3%A4"},
 508         {"foo/BAR", map[string]string{"ctl": "newline: \n nil: \000"}, "foo/bar; ctl*=utf-8''newline%3A%20%0A%20nil%3A%20%00"},
 509         {"foo/bar", map[string]string{"a": "av", "b": "bv", "c": "cv"}, "foo/bar; a=av; b=bv; c=cv"},
 510         {"foo/bar", map[string]string{"0": "'", "9": "'"}, "foo/bar; 0='; 9='"},
 511         {"foo", map[string]string{"bar": ""}, `foo; bar=""`},
 512 }
 513
 514 func TestFormatMediaType(t *testing.T) {
 515         for i, tt := range formatTests {
 516                 got := FormatMediaType(tt.typ, tt.params)
 517                 if got != tt.want {
 518                         t.Errorf("%d. FormatMediaType(%q, %v) = %q; want %q", i, tt.typ, tt.params, got, tt.want)
 519                 }
 520                 if got == "" {
 521                         continue
 522                 }
 523                 typ, params, err := ParseMediaType(got)
 524                 if err != nil {
 525                         t.Errorf("%d. ParseMediaType(%q) err: %v", i, got, err)
 526                 }
 527                 if typ != strings.ToLower(tt.typ) {
 528                         t.Errorf("%d. ParseMediaType(%q) typ = %q; want %q", i, got, typ, tt.typ)
 529                 }
 530                 for k, v := range tt.params {
 531                         k = strings.ToLower(k)
 532                         if params[k] != v {
 533                                 t.Errorf("%d. ParseMediaType(%q) params[%s] = %q; want %q", i, got, k, params[k], v)
 534                         }
 535                 }
 536         }
 537 }