Rename the package to "test".

test/backend/platform_selector/scanner_test.dart

 // Copyright (c) 2015, 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:unittest/src/backend/platform_selector/scanner.dart';
-import 'package:unittest/src/backend/platform_selector/token.dart';
+import 'package:test/test.dart';
+import 'package:test/src/backend/platform_selector/scanner.dart';
+import 'package:test/src/backend/platform_selector/token.dart';
 
 void main() {
   group("peek()", () {
     test("returns the next token without consuming it", () {
       var scanner = new Scanner("( )");
       expect(scanner.peek().type, equals(TokenType.leftParen));
       expect(scanner.peek().type, equals(TokenType.leftParen));
       expect(scanner.peek().type, equals(TokenType.leftParen));
     });
 
@@ skipping 239 matching lines @@
   // Complicate the selector to test that the span covers it correctly.
   var token = _scan("   $selector  ");
   expect(token.type, equals(type));
   expect(token.span.text, equals(selector));
   expect(token.span.start.offset, equals(3));
   expect(token.span.end.offset, equals(3 + selector.length));
 }
 
 /// Scans a single token from [selector].
 Token _scan(String selector) => new Scanner(selector).next();