Add an integration test for kythe support with bug fixes

pkg/analysis_server/test/integration/kythe/get_kythe_entries_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/protocol/protocol_generated.dart';
+import 'package:test/test.dart';
+import 'package:test_reflective_loader/test_reflective_loader.dart';
+
+import '../support/integration_tests.dart';
+
+main() {
+  defineReflectiveSuite(() {
+    defineReflectiveTests(GetKytheEntriesTest);
+  });
+}
+
+@reflectiveTest
+class GetKytheEntriesTest extends AbstractAnalysisServerIntegrationTest {
+  test_getKytheEntries() async {
+    writeFile(sourcePath('WORKSPACE'), '');
+    String pathname = sourcePath('pkg/test.dart');
+    String text = r'''
+class Foo {}
+
+class Bar {
+  Foo foo;
+}
+''';
+    writeFile(pathname, text);
+    standardAnalysisSetup();
+
+    await analysisFinished;
+
+    KytheGetKytheEntriesResult result =
+        await sendKytheGetKytheEntries(pathname);
+    expect(result.entries, isNotEmpty);
+    expect(result.files, isEmpty);
+  }
+}