Add a new MIME-type package 'mime', with implementation for handling mime-type lookup by path (fine…

pkg/mime/test/mime_type_test.dart

Index: pkg/mime/test/mime_type_test.dart
diff --git a/pkg/mime/test/mime_type_test.dart b/pkg/mime/test/mime_type_test.dart
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+++ b/pkg/mime/test/mime_type_test.dart
@@ -0,0 +1,103 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "package:unittest/unittest.dart";
+import 'package:mime/mime.dart';
+
+void expectMimeType(String path,
+                    String expectedMimeType,
+                    {List<int> headerBytes,
+                     MimeTypeResolver resolver}) {
+  String mimeType;
+  if (resolver == null) {
+    mimeType = lookupMimeType(path, headerBytes: headerBytes);
+  } else {
+    mimeType = resolver.lookup(path, headerBytes: headerBytes);
+  }
+
+  if (mimeType != expectedMimeType) {
+    throw "Expect '$expectedMimeType' but got '$mimeType'";
+  }
+}
+
+void main() {
+  group('global-lookup', () {
+    test('by-path', () {
+      expectMimeType('file.dart', 'application/dart');
+      // Test mixed-case
+      expectMimeType('file.DaRT', 'application/dart');
+      expectMimeType('file.html', 'text/html');
+      expectMimeType('file.xhtml', 'application/xhtml+xml');
+      expectMimeType('file.jpeg', 'image/jpeg');
+      expectMimeType('file.jpg', 'image/jpeg');
+      expectMimeType('file.png', 'image/png');
+      expectMimeType('file.gif', 'image/gif');
+      expectMimeType('file.cc', 'text/x-c');
+      expectMimeType('file.c', 'text/x-c');
+      expectMimeType('file.css', 'text/css');
+      expectMimeType('file.js', 'application/javascript');
+      expectMimeType('file.ps', 'application/postscript');
+      expectMimeType('file.pdf', 'application/pdf');
+      expectMimeType('file.tiff', 'image/tiff');
+      expectMimeType('file.tif', 'image/tiff');
+    });
+
+    test('unknown-mime-type', () {
+      expectMimeType('file.unsupported-extension', null);
+    });
+
+    test('by-header-bytes', () {
+      expectMimeType('file.jpg',
+                     'image/png',
+                     headerBytes: [0x89, 0x50, 0x4E, 0x47,
+                                   0x0D, 0x0A, 0x1A, 0x0A]);
+      expectMimeType('file.jpg',
+                     'image/gif',
+                     headerBytes: [0x47, 0x49, 0x46, 0x38, 0x39,
+                                   0x61, 0x0D, 0x0A, 0x1A, 0x0A]);
+      expectMimeType('file.gif',
+                     'image/jpeg',
+                     headerBytes: [0xFF, 0xD8, 0x46, 0x38, 0x39,
+                                   0x61, 0x0D, 0x0A, 0x1A, 0x0A]);
+      expectMimeType('file.mp4',
+                     'video/mp4',
+                     headerBytes: [0x00, 0x00, 0x00, 0x04, 0x66, 0x74,
+                                   0x79, 0x70, 0x33, 0x67, 0x70, 0x35]);
+    });
+  });
+
+  group('custom-resolver', () {
+    test('override-extension', () {
+      var resolver = new MimeTypeResolver();
+      resolver.addExtension('jpg', 'my-mime-type');
+      expectMimeType('file.jpg', 'my-mime-type', resolver: resolver);
+    });
+
+    test('fallthrough-extension', () {
+      var resolver = new MimeTypeResolver();
+      resolver.addExtension('jpg2', 'my-mime-type');
+      expectMimeType('file.jpg', 'image/jpeg', resolver: resolver);
+    });
+
+    test('with-mask', () {
+      var resolver = new MimeTypeResolver.empty();
+      resolver.addMagicNumber([0x01, 0x02, 0x03],
+                              'my-mime-type',
+                              mask: [0x01, 0xFF, 0xFE]);
+      expectMimeType('file',
+                     'my-mime-type',
+                     headerBytes: [0x01, 0x02, 0x03],
+                     resolver: resolver);
+      expectMimeType('file',
+                     null,
+                     headerBytes: [0x01, 0x03, 0x03],
+                     resolver: resolver);
+      expectMimeType('file',
+                     'my-mime-type',
+                     headerBytes: [0xFF, 0x02, 0x02],
+                     resolver: resolver);
+    });
+  });
+}
+