Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/services/correction/source_range_test.dart

 // Copyright (c) 2014, 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.
 
 library test.services.correction.source_range;
 
 import 'package:analysis_server/src/services/correction/source_range.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../abstract_single_unit.dart';
 import '../../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(SourceRangesTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(SourceRangesTest);
+  });
 }
 
 @reflectiveTest
 class SourceRangesTest extends AbstractSingleUnitTest {
   void test_rangeElementName() {
     resolveTestUnit('class ABC {}');
     Element element = findElement('ABC');
     expect(rangeElementName(element), new SourceRange(6, 3));
   }
 
@@ skipping 74 matching lines @@
     expect(rangeStartStart(mainName, mainBody), new SourceRange(0, 7));
   }
 
   void test_rangeToken() {
     resolveTestUnit(' main() {}');
     FunctionDeclaration mainFunction = testUnit.declarations[0];
     SimpleIdentifier mainName = mainFunction.name;
     expect(rangeToken(mainName.beginToken), new SourceRange(1, 4));
   }
 }