Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/integration/analysis/lint_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.integration.analysis.lint;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analyzer/src/generated/engine.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
 import '../integration_tests.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(LintIntegrationTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(LintIntegrationTest);
+  });
 }
 
 @reflectiveTest
 class LintIntegrationTest extends AbstractAnalysisServerIntegrationTest {
   test_no_lints_when_not_specified() async {
     String source = sourcePath('test.dart');
     writeFile(
         source,
         '''
 class abc { // lint: not CamelCase (should get ignored though)
@@ skipping 58 matching lines @@
 
     expect(currentAnalysisErrors[source], isList);
     List<AnalysisError> errors = currentAnalysisErrors[source];
     expect(errors, hasLength(1));
     AnalysisError error = errors[0];
     expect(error.location.file, source);
     expect(error.severity, AnalysisErrorSeverity.INFO);
     expect(error.type, AnalysisErrorType.LINT);
   }
 }