Add analysis server integration tests for the search domain.

pkg/analysis_server/test/integration/search/find_top_level_declarations_test.dart

+// Copyright (c) 2017, 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:analysis_server/plugin/protocol/protocol.dart';
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../integration_tests.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(FindTopLevelDeclarationsTest);
+  });
+}
+
+@reflectiveTest
+class FindTopLevelDeclarationsTest extends AbstractAnalysisServerIntegrationTest {
+  String pathname;
+
+  test_findTopLevelDeclarations() async {
+    String text = r'''
+String qux() => 'qux';
+
+class Foo {
+  void bar() { };
+  int baz() => 0;
+}
+''';
+
+    pathname = sourcePath('foo.dart');
+    writeFile(pathname, text);
+    standardAnalysisSetup();
+    await analysisFinished;
+
+    SearchFindTopLevelDeclarationsResult declarationsResult =
+        await sendSearchFindTopLevelDeclarations(r'qu.*');
+    expect(declarationsResult.id, isNotNull);
+
+    SearchResultsParams searchParams = await onSearchResults.first;
+    expect(searchParams.id, declarationsResult.id);
+    expect(searchParams.isLast, isTrue);
+    expect(searchParams.results, isNotEmpty);
+
+    SearchResult result = searchParams.results.first;
+    expect(result.location.file, pathname);
+    expect(result.isPotential, isFalse);
+    expect(result.kind.name, SearchResultKind.DECLARATION.name);
+    expect(result.path.first.name, 'qux');
+  }
+
+  @override
+  bool get enableNewAnalysisDriver => true;
+}